Merge branch 'read-path-index'
This commit is contained in:
commit
ee018f06e2
24 changed files with 1334 additions and 274 deletions
59
.claude/agents/database-developer.md
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59
.claude/agents/database-developer.md
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@ -0,0 +1,59 @@
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---
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name: database-developer
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description: Engine work under database/src (tables, WAL, indexes, slot
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encode/decode, wo_idx_probe) and the DB seams in runtime/src (db
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builtins, the DB actor RPC). Use for index/lookup changes, WAL format
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or replay work, constraint enforcement (@unique, FK restrict),
|
||||
checkpoint/compaction (iteration 32), single-file store (33), write-path
|
||||
optimization (perf-targets #1), and db-bench regressions. NOT for
|
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compiler surface, fibers/scheduler, or framework .wo code.
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||||
tools: Read, Edit, Write, Grep, Glob, Bash
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---
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You are the database engineer for writeonce's embedded engine.
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Doctrine (non-negotiable):
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- C11 + libc only. No new dependencies, no atomics on the data path.
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- RAM is authoritative; the WAL makes it durable. An ack means the
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commit fsynced. Replay is whole-or-not-at-all; torn tails drop.
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- The engine and the VM heap are two memory worlds crossed only by
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copy (the out-gate: wo_val_decode_vm always copies; rows never hold
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VM pointers). The owner thread never reads another shard's VM heap.
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- Choke points: wo_row_insert / wo_row_remove are the ONLY paths that
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||||
touch storage; indexes are maintained inside them, nowhere else. A
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||||
hash is a hint, never an answer — every bucket hit re-verifies.
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- The engine is single-threaded by contract: shard 0 owns it; workers
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||||
reach it through the DB actor RPC (wo_db_exec_req). Never add locks.
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Traps and messages must stay byte-identical between wo_builtin_db
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and wo_db_exec_req.
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||||
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||||
File map:
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- database/src/table.c|h — slabs, id hash (hget, O(1)), secondary
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indexes (idx_bucket hash multimap), wo_idx_probe (read-path probe;
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idx_hash_key1 must reproduce idx_hash bit for bit), encode/decode.
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CODE-LOGIC.md beside it is the long-term memory — update it.
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- database/src/wal.c|h — record grammar, staged batch, commit, replay.
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- database/src/db.c|h — statement executors (wo_builtin_db) and the
|
||||
RPC executor (wo_db_exec_req).
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||||
- runtime/src/vm.c — the requester half (wo_db_rpc); builtin.c routes.
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||||
- Contracts: docs/plan/oop-vm/04-db-binding.md (normative — extend it
|
||||
when formats change). Benchmarks: docs/examples/db-bench,
|
||||
bench/baseline.json (tolerance policy lives in scripts/db-bench.py's
|
||||
tolerance_for). Known targets: docs/plan/perf-targets.md.
|
||||
|
||||
Working rules:
|
||||
- TDD: a failing corpus fixture or runtime/test case first (the
|
||||
wo_idx_probe suite in runtime/test/test_table.c is the template),
|
||||
then code.
|
||||
- Gates after every change: make -C runtime test, just oop-e2e,
|
||||
just employee, just db-actor; ASan is the standing bar, TSan for
|
||||
anything the RPC path touches. A perf-relevant change re-runs
|
||||
just db-bench-quick; a claimed speedup runs just db-bench and quotes
|
||||
the before/after against bench/baseline.json (durable numbers need a
|
||||
real disk — tmpfs makes fsync free and the number a lie).
|
||||
- Match existing style; comments state constraints, not narration.
|
||||
- Branch off the current line, commits local only, never push; bullet
|
||||
commit messages, ≤25 lines.
|
||||
|
||||
Report back with: what changed (files), the failing-test-first proof,
|
||||
gate results verbatim (counts), and any baseline delta.
|
||||
|
|
@ -3,451 +3,451 @@
|
|||
"N": 20000,
|
||||
"crash_reps": 3,
|
||||
"msg_n": 200000,
|
||||
"note": "refresh only with a commit that says why; tolerances widened 2026-08-21 from the two-run repeatability check: mix* 50% (scheduling-dependent small counts), read/query 35% (machine jitter), everything else 15%; msgrate floors value/8 \u2014 quick-mode's small N is spawn-dominated and grazed value/4",
|
||||
"note": "refresh only with a commit that says why; tolerances come from tolerance_for() in the driver",
|
||||
"wal_n": 4000
|
||||
},
|
||||
"durable.s1.mixread.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 187,
|
||||
"floor": 2302,
|
||||
"tolerance_pct": 50,
|
||||
"value": 751
|
||||
"value": 9211
|
||||
},
|
||||
"durable.s1.mixread.p50us": {
|
||||
"dir": "lower",
|
||||
"floor": 11844,
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 2961
|
||||
"value": 1
|
||||
},
|
||||
"durable.s1.mixread.p99us": {
|
||||
"dir": "lower",
|
||||
"floor": 19044,
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 4761
|
||||
"value": 12
|
||||
},
|
||||
"durable.s1.mixwrite.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 20,
|
||||
"floor": 255,
|
||||
"tolerance_pct": 50,
|
||||
"value": 83
|
||||
"value": 1023
|
||||
},
|
||||
"durable.s1.mixwrite.p50us": {
|
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"dir": "lower",
|
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"floor": 19408,
|
||||
"floor": 1720,
|
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"tolerance_pct": 50,
|
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"value": 4852
|
||||
"value": 430
|
||||
},
|
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"durable.s1.mixwrite.p99us": {
|
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|
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|
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|
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"tolerance_pct": 50,
|
||||
"value": 20000
|
||||
"value": 664
|
||||
},
|
||||
"durable.s1.query.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 335,
|
||||
"tolerance_pct": 35,
|
||||
"value": 1341
|
||||
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|
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|
||||
"value": 1234567
|
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},
|
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"durable.s1.query.p50us": {
|
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"dir": "lower",
|
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"floor": 2996,
|
||||
"tolerance_pct": 35,
|
||||
"value": 749
|
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"floor": 100,
|
||||
"tolerance_pct": 50,
|
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"value": 1
|
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},
|
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"durable.s1.query.p99us": {
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|
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|
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|
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|
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"floor": 100,
|
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"tolerance_pct": 50,
|
||||
"value": 1
|
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},
|
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"durable.s1.read.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 336,
|
||||
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|
||||
"value": 1346
|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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"value": 1
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},
|
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"durable.s1.seed.ops_sec": {
|
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
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},
|
||||
"durable.s1.seed.p50us": {
|
||||
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|
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|
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|
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|
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"durable.s1.seed.p99us": {
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|
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|
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|
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|
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|
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"durable.s1.write.ops_sec": {
|
||||
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|
||||
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|
||||
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|
||||
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|
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|
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|
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|
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|
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|
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"durable.s1.write.p99us": {
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|
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|
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|
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|
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|
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|
||||
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|
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|
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|
||||
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|
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|
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|
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|
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|
||||
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|
||||
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|
||||
},
|
||||
"durable.sN.mixread.p99us": {
|
||||
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|
||||
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|
||||
"tolerance_pct": 50,
|
||||
"value": 20000
|
||||
},
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
"value": 2
|
||||
},
|
||||
"durable.sN.mixwrite.p50us": {
|
||||
"dir": "lower",
|
||||
"floor": 80000,
|
||||
"tolerance_pct": 50,
|
||||
"value": 20000
|
||||
},
|
||||
"durable.sN.mixwrite.p99us": {
|
||||
"dir": "lower",
|
||||
"floor": 80000,
|
||||
"tolerance_pct": 50,
|
||||
"value": 20000
|
||||
},
|
||||
"durable.sN.query.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 328,
|
||||
"tolerance_pct": 35,
|
||||
"value": 1312
|
||||
},
|
||||
"durable.sN.query.p50us": {
|
||||
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
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|
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|
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|
||||
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|
||||
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|
||||
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|
||||
},
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
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|
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
"durable.sN.query.p99us": {
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
"value": 2
|
||||
},
|
||||
"ram.s1.msgrate.msgs_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 1678077,
|
||||
"floor": 2087508,
|
||||
"tolerance_pct": 15,
|
||||
"value": 13424620
|
||||
"value": 16700066
|
||||
},
|
||||
"ram.s1.query.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 378,
|
||||
"tolerance_pct": 35,
|
||||
"value": 1512
|
||||
"floor": 247402,
|
||||
"tolerance_pct": 50,
|
||||
"value": 989609
|
||||
},
|
||||
"ram.s1.query.p50us": {
|
||||
"dir": "lower",
|
||||
"floor": 2536,
|
||||
"tolerance_pct": 35,
|
||||
"value": 634
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 1
|
||||
},
|
||||
"ram.s1.query.p99us": {
|
||||
"dir": "lower",
|
||||
"floor": 3196,
|
||||
"tolerance_pct": 35,
|
||||
"value": 799
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 1
|
||||
},
|
||||
"ram.s1.read.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 407,
|
||||
"tolerance_pct": 35,
|
||||
"value": 1630
|
||||
"floor": 274393,
|
||||
"tolerance_pct": 50,
|
||||
"value": 1097574
|
||||
},
|
||||
"ram.s1.read.p50us": {
|
||||
"dir": "lower",
|
||||
"floor": 2396,
|
||||
"tolerance_pct": 35,
|
||||
"value": 599
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 1
|
||||
},
|
||||
"ram.s1.read.p99us": {
|
||||
"dir": "lower",
|
||||
"floor": 3124,
|
||||
"tolerance_pct": 35,
|
||||
"value": 781
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 1
|
||||
},
|
||||
"ram.s1.seed.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 64354,
|
||||
"floor": 61297,
|
||||
"tolerance_pct": 15,
|
||||
"value": 257416
|
||||
"value": 245188
|
||||
},
|
||||
"ram.s1.seed.p50us": {
|
||||
"dir": "lower",
|
||||
"floor": 16,
|
||||
"floor": 100,
|
||||
"tolerance_pct": 15,
|
||||
"value": 4
|
||||
},
|
||||
"ram.s1.seed.p99us": {
|
||||
"dir": "lower",
|
||||
"floor": 32,
|
||||
"floor": 100,
|
||||
"tolerance_pct": 15,
|
||||
"value": 8
|
||||
"value": 9
|
||||
},
|
||||
"ram.s1.write.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 718,
|
||||
"floor": 48866,
|
||||
"tolerance_pct": 15,
|
||||
"value": 2872
|
||||
"value": 195465
|
||||
},
|
||||
"ram.s1.write.p50us": {
|
||||
"dir": "lower",
|
||||
"floor": 2320,
|
||||
"floor": 100,
|
||||
"tolerance_pct": 15,
|
||||
"value": 580
|
||||
"value": 7
|
||||
},
|
||||
"ram.s1.write.p99us": {
|
||||
"dir": "lower",
|
||||
"floor": 3444,
|
||||
"floor": 100,
|
||||
"tolerance_pct": 15,
|
||||
"value": 861
|
||||
"value": 12
|
||||
},
|
||||
"ram.sN.mixread.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 5,
|
||||
"floor": 11229,
|
||||
"tolerance_pct": 50,
|
||||
"value": 21
|
||||
"value": 44918
|
||||
},
|
||||
"ram.sN.mixread.p50us": {
|
||||
"dir": "lower",
|
||||
"floor": 80000,
|
||||
"floor": 236,
|
||||
"tolerance_pct": 50,
|
||||
"value": 20000
|
||||
"value": 59
|
||||
},
|
||||
"ram.sN.mixread.p99us": {
|
||||
"dir": "lower",
|
||||
"floor": 80000,
|
||||
"floor": 432,
|
||||
"tolerance_pct": 50,
|
||||
"value": 20000
|
||||
"value": 108
|
||||
},
|
||||
"ram.sN.mixwrite.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 0,
|
||||
"floor": 1247,
|
||||
"tolerance_pct": 50,
|
||||
"value": 2
|
||||
"value": 4990
|
||||
},
|
||||
"ram.sN.mixwrite.p50us": {
|
||||
"dir": "lower",
|
||||
"floor": 80000,
|
||||
"floor": 256,
|
||||
"tolerance_pct": 50,
|
||||
"value": 20000
|
||||
"value": 64
|
||||
},
|
||||
"ram.sN.mixwrite.p99us": {
|
||||
"dir": "lower",
|
||||
"floor": 80000,
|
||||
"floor": 516,
|
||||
"tolerance_pct": 50,
|
||||
"value": 20000
|
||||
"value": 129
|
||||
},
|
||||
"ram.sN.msgrate.msgs_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 305743,
|
||||
"tolerance_pct": 15,
|
||||
"value": 2445944
|
||||
"floor": 355876,
|
||||
"tolerance_pct": 50,
|
||||
"value": 2847015
|
||||
},
|
||||
"ram.sN.query.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 333,
|
||||
"tolerance_pct": 35,
|
||||
"value": 1333
|
||||
"floor": 307125,
|
||||
"tolerance_pct": 50,
|
||||
"value": 1228501
|
||||
},
|
||||
"ram.sN.query.p50us": {
|
||||
"dir": "lower",
|
||||
"floor": 2968,
|
||||
"tolerance_pct": 35,
|
||||
"value": 742
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 1
|
||||
},
|
||||
"ram.sN.query.p99us": {
|
||||
"dir": "lower",
|
||||
"floor": 3392,
|
||||
"tolerance_pct": 35,
|
||||
"value": 848
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 1
|
||||
},
|
||||
"ram.sN.read.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 372,
|
||||
"tolerance_pct": 35,
|
||||
"value": 1488
|
||||
"floor": 340692,
|
||||
"tolerance_pct": 50,
|
||||
"value": 1362769
|
||||
},
|
||||
"ram.sN.read.p50us": {
|
||||
"dir": "lower",
|
||||
"floor": 2504,
|
||||
"tolerance_pct": 35,
|
||||
"value": 626
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 1
|
||||
},
|
||||
"ram.sN.read.p99us": {
|
||||
"dir": "lower",
|
||||
"floor": 3228,
|
||||
"tolerance_pct": 35,
|
||||
"value": 807
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 1
|
||||
},
|
||||
"ram.sN.seed.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 74404,
|
||||
"tolerance_pct": 15,
|
||||
"value": 297619
|
||||
"floor": 72890,
|
||||
"tolerance_pct": 50,
|
||||
"value": 291562
|
||||
},
|
||||
"ram.sN.seed.p50us": {
|
||||
"dir": "lower",
|
||||
"floor": 12,
|
||||
"tolerance_pct": 15,
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 3
|
||||
},
|
||||
"ram.sN.seed.p99us": {
|
||||
"dir": "lower",
|
||||
"floor": 28,
|
||||
"tolerance_pct": 15,
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 7
|
||||
},
|
||||
"ram.sN.write.ops_sec": {
|
||||
"dir": "higher",
|
||||
"floor": 634,
|
||||
"tolerance_pct": 15,
|
||||
"value": 2537
|
||||
"floor": 60518,
|
||||
"tolerance_pct": 50,
|
||||
"value": 242072
|
||||
},
|
||||
"ram.sN.write.p50us": {
|
||||
"dir": "lower",
|
||||
"floor": 2408,
|
||||
"tolerance_pct": 15,
|
||||
"value": 602
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 6
|
||||
},
|
||||
"ram.sN.write.p99us": {
|
||||
"dir": "lower",
|
||||
"floor": 3552,
|
||||
"tolerance_pct": 15,
|
||||
"value": 888
|
||||
"floor": 100,
|
||||
"tolerance_pct": 50,
|
||||
"value": 9
|
||||
}
|
||||
}
|
||||
40
bench/compare/go-sqlite/README.md
Normal file
40
bench/compare/go-sqlite/README.md
Normal file
|
|
@ -0,0 +1,40 @@
|
|||
# go-sqlite — the comparison harness
|
||||
|
||||
Go (`database/sql` + mattn/go-sqlite3, cgo) mirroring
|
||||
`docs/examples/db-bench`'s schema and modes line-for-line, so the
|
||||
numbers align column-for-column. Not a gate — a reference point;
|
||||
SQLite is the honest peer (embedded, single-writer, WAL, same
|
||||
durability knob).
|
||||
|
||||
Run: `go build -o go-sqlite . && ./go-sqlite ram 20000` /
|
||||
`./go-sqlite durable 20000 <ext4-dir>` — a tmpfs dir makes fsync free
|
||||
and the durable numbers a lie (measured: 122k/s on /tmp vs 3.1k/s on
|
||||
ext4; the campaign's own trap, re-confirmed).
|
||||
|
||||
## Measured 2026-08-22 (N=20k, same machine, ext4, single-shard vs single-conn)
|
||||
|
||||
| metric | writeonce | Go+SQLite | ratio |
|
||||
| --- | --- | --- | --- |
|
||||
| ram seed inserts/s | 245,188 | 296,965 | sqlite ×1.2 |
|
||||
| ram read ops/s (p50µs) | 1,097,574 (1) | 429,645 (2) | **wo ×2.6** |
|
||||
| ram query ops/s | 989,609 | 154,559 | **wo ×6.4** |
|
||||
| ram write ops/s | 195,465 | 380,069 | sqlite ×1.9 |
|
||||
| durable seed inserts/s (p50µs) | 4,460 (~220) | 3,113 (241) | **wo ×1.4** |
|
||||
| durable write ops/s | 2,324 | 3,257 | sqlite ×1.4 |
|
||||
|
||||
Readings, honestly:
|
||||
|
||||
- **Reads/queries: writeonce wins 2.6–6.4×** — RAM-authoritative rows +
|
||||
the index probe answer without page decoding or a bytecode/VM ↔ cgo
|
||||
boundary; SQLite pays B-tree page traversal + the cgo call per op.
|
||||
- **ram writes: SQLite wins ~1.9×** — writeonce's update path re-runs a
|
||||
probe per update (update-through-query) and its insert encodes slots
|
||||
per field; SQLite's page write is tight. Registered as target 1 in
|
||||
[`docs/plan/perf-targets.md`](../../../docs/plan/perf-targets.md).
|
||||
- **durable seed: writeonce wins ~1.4×** (append-only WAL + fdatasync
|
||||
vs SQLite WAL frame + FULL sync); durable mixed writes flip back to
|
||||
SQLite ×1.4 — the update's extra probe again.
|
||||
- Caveats: different languages (Go harness pays ~1µs cgo per op; wo
|
||||
pays its interpreter), both are the honest end-to-end app-visible
|
||||
cost of their stack. Single connection vs single shard; no
|
||||
concurrency comparison here (SQLite has one writer by design).
|
||||
BIN
bench/compare/go-sqlite/go-sqlite
Executable file
BIN
bench/compare/go-sqlite/go-sqlite
Executable file
Binary file not shown.
5
bench/compare/go-sqlite/go.mod
Normal file
5
bench/compare/go-sqlite/go.mod
Normal file
|
|
@ -0,0 +1,5 @@
|
|||
module writeonce.bench/go-sqlite
|
||||
|
||||
go 1.25
|
||||
|
||||
require github.com/mattn/go-sqlite3 v1.14.34
|
||||
2
bench/compare/go-sqlite/go.sum
Normal file
2
bench/compare/go-sqlite/go.sum
Normal file
|
|
@ -0,0 +1,2 @@
|
|||
github.com/mattn/go-sqlite3 v1.14.34 h1:3NtcvcUnFBPsuRcno8pUtupspG/GM+9nZ88zgJcp6Zk=
|
||||
github.com/mattn/go-sqlite3 v1.14.34/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
|
||||
180
bench/compare/go-sqlite/main.go
Normal file
180
bench/compare/go-sqlite/main.go
Normal file
|
|
@ -0,0 +1,180 @@
|
|||
// go-sqlite — the comparison harness for docs/examples/db-bench.
|
||||
// Mirrors the .wo sample's schema and modes so the lines align
|
||||
// column-for-column: <op> <count> <ops/sec> <p50us> <p99us>.
|
||||
//
|
||||
// Flavors mirror the campaign's: "ram" = :memory:, "durable" = a file
|
||||
// with synchronous=FULL and per-statement autocommit — an fsync per
|
||||
// insert, the same ack-after-durable contract writeonce's WAL gives.
|
||||
//
|
||||
// Usage: go-sqlite <ram|durable> <N> [dir]
|
||||
package main
|
||||
|
||||
import (
|
||||
"database/sql"
|
||||
"fmt"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"sort"
|
||||
"time"
|
||||
|
||||
_ "github.com/mattn/go-sqlite3"
|
||||
)
|
||||
|
||||
func pct(d []time.Duration, p int) int64 {
|
||||
if len(d) == 0 {
|
||||
return 0
|
||||
}
|
||||
s := make([]time.Duration, len(d))
|
||||
copy(s, d)
|
||||
sort.Slice(s, func(i, j int) bool { return s[i] < s[j] })
|
||||
i := len(s) * p / 100
|
||||
if i >= len(s) {
|
||||
i = len(s) - 1
|
||||
}
|
||||
return s[i].Microseconds()
|
||||
}
|
||||
|
||||
func report(op string, n int, total time.Duration, per []time.Duration) {
|
||||
us := total.Microseconds()
|
||||
if us < 1 {
|
||||
us = 1
|
||||
}
|
||||
fmt.Printf("%s %d %d %d %d\n", op, n, int64(n)*1e6/us, pct(per, 50), pct(per, 99))
|
||||
}
|
||||
|
||||
func must(err error) {
|
||||
if err != nil {
|
||||
fmt.Fprintln(os.Stderr, "go-sqlite:", err)
|
||||
os.Exit(1)
|
||||
}
|
||||
}
|
||||
|
||||
func main() {
|
||||
if len(os.Args) < 3 {
|
||||
fmt.Fprintln(os.Stderr, "usage: go-sqlite <ram|durable> <N> [dir]")
|
||||
os.Exit(2)
|
||||
}
|
||||
flavor := os.Args[1]
|
||||
var n int
|
||||
fmt.Sscanf(os.Args[2], "%d", &n)
|
||||
dsn := ":memory:"
|
||||
if flavor == "durable" {
|
||||
dir := "."
|
||||
if len(os.Args) > 3 {
|
||||
dir = os.Args[3]
|
||||
}
|
||||
// FULL = fsync before every commit acknowledges — the peer of
|
||||
// writeonce's per-statement WAL commit
|
||||
dsn = filepath.Join(dir, "bench.db") + "?_journal_mode=WAL&_synchronous=FULL"
|
||||
}
|
||||
db, err := sql.Open("sqlite3", dsn)
|
||||
must(err)
|
||||
defer db.Close()
|
||||
db.SetMaxOpenConns(1) // one writer, like the engine; keeps :memory: coherent
|
||||
|
||||
_, err = db.Exec(`
|
||||
CREATE TABLE buckets (id INTEGER PRIMARY KEY, tag TEXT NOT NULL UNIQUE);
|
||||
CREATE TABLE items (id INTEGER PRIMARY KEY, k INTEGER NOT NULL,
|
||||
v INTEGER NOT NULL,
|
||||
bucket INTEGER NOT NULL REFERENCES buckets(id));
|
||||
CREATE INDEX items_k ON items(k);
|
||||
CREATE INDEX items_bucket ON items(bucket);
|
||||
PRAGMA foreign_keys = ON;`)
|
||||
must(err)
|
||||
|
||||
kmod := n / 10
|
||||
if kmod < 1 {
|
||||
kmod = 1
|
||||
}
|
||||
itemV := func(i int) int { return (i * 37) % 1000 }
|
||||
lcg := func(s int) int {
|
||||
x := s*1103515245 + 12345
|
||||
if x < 0 {
|
||||
x = -x
|
||||
}
|
||||
return x
|
||||
}
|
||||
|
||||
// seed: one bucket per 100 children, per-statement autocommit —
|
||||
// mirror of the .wo sample's ack-per-insert shape
|
||||
insB, err := db.Prepare("INSERT INTO buckets(tag) VALUES(?)")
|
||||
must(err)
|
||||
insI, err := db.Prepare("INSERT INTO items(k, v, bucket) VALUES(?, ?, ?)")
|
||||
must(err)
|
||||
per := make([]time.Duration, 0, n)
|
||||
t0 := time.Now()
|
||||
var bref int64
|
||||
for i, b := 1, 0; i <= n; b++ {
|
||||
r, err := insB.Exec(fmt.Sprintf("b%d", b))
|
||||
must(err)
|
||||
bref, _ = r.LastInsertId()
|
||||
for j := 0; j < 100 && i <= n; j, i = j+1, i+1 {
|
||||
o0 := time.Now()
|
||||
_, err = insI.Exec(i%kmod, itemV(i), bref)
|
||||
must(err)
|
||||
per = append(per, time.Since(o0))
|
||||
}
|
||||
}
|
||||
report("seed", n, time.Since(t0), per)
|
||||
|
||||
// read: indexed point lookups, LIMIT 1 — the .wo take-1 shape
|
||||
rd, err := db.Prepare("SELECT v FROM items WHERE k = ? LIMIT 1")
|
||||
must(err)
|
||||
per = per[:0]
|
||||
sink, s := 0, 42
|
||||
nr := n / 2
|
||||
t0 = time.Now()
|
||||
for i := 0; i < nr; i++ {
|
||||
s = lcg(s)
|
||||
o0 := time.Now()
|
||||
var v int
|
||||
if err := rd.QueryRow(s % kmod).Scan(&v); err == nil {
|
||||
sink += v
|
||||
}
|
||||
per = append(per, time.Since(o0))
|
||||
}
|
||||
report("read", nr, time.Since(t0), per)
|
||||
|
||||
// query: full equality probes (~10 rows each), materialized + counted
|
||||
qr, err := db.Prepare("SELECT v FROM items WHERE k = ?")
|
||||
must(err)
|
||||
per = per[:0]
|
||||
rows, s := 0, 7
|
||||
nq := n / 10
|
||||
t0 = time.Now()
|
||||
for i := 0; i < nq; i++ {
|
||||
s = lcg(s)
|
||||
o0 := time.Now()
|
||||
rs, err := qr.Query(s % kmod)
|
||||
must(err)
|
||||
for rs.Next() {
|
||||
rows++
|
||||
}
|
||||
rs.Close()
|
||||
per = append(per, time.Since(o0))
|
||||
}
|
||||
report("query", nq, time.Since(t0), per)
|
||||
fmt.Printf("query rows %d\n", rows)
|
||||
|
||||
// write: alternating inserts (disjoint k) and update-through-query
|
||||
up, err := db.Prepare(
|
||||
"UPDATE items SET v = v + 1 WHERE id = (SELECT id FROM items WHERE k = ? LIMIT 1)")
|
||||
must(err)
|
||||
per = per[:0]
|
||||
s = 99
|
||||
nw := n / 2
|
||||
t0 = time.Now()
|
||||
for i := 0; i < nw; i++ {
|
||||
o0 := time.Now()
|
||||
if i%2 == 0 {
|
||||
_, err = insI.Exec(2000000+i, itemV(i), bref)
|
||||
} else {
|
||||
s = lcg(s)
|
||||
_, err = up.Exec(s % kmod)
|
||||
}
|
||||
must(err)
|
||||
per = append(per, time.Since(o0))
|
||||
}
|
||||
report("write", nw, time.Since(t0), per)
|
||||
_ = sink
|
||||
}
|
||||
|
|
@ -888,6 +888,64 @@ let backlink_target (p : pctx) (base_cid : int) (fname : string) : (int * int) o
|
|||
in
|
||||
find 0 sc.cr_indexes)
|
||||
|
||||
(* Read-path index selection (the O(1) slice): a query whose where list
|
||||
contains `var.col == key` (either side), where col carries a single-
|
||||
column index, lowers its SOURCE to DB_PROBE instead of DB_SCAN — the
|
||||
guards all still run over the candidates, so semantics cannot drift.
|
||||
Keys are deliberately just a plain identifier (not the range var) or
|
||||
an integer literal: anything richer raises operand-ownership questions
|
||||
this slice does not need. Float columns are excluded: the engine
|
||||
verifies with raw-word equality while the VM's `==` folds -0.0/+0.0,
|
||||
and a probe MISS cannot be resurrected by the recheck. *)
|
||||
let probe_key_of_where (p : pctx) (q : Ast.query) (cid : int) :
|
||||
(int * Ast.expr) option =
|
||||
let cr = p.p_classes.(cid) in
|
||||
let col_of fname =
|
||||
let col = ref (-1) in
|
||||
Array.iteri (fun i (n, _) -> if n = fname then col := i) cr.cr_fields;
|
||||
!col
|
||||
in
|
||||
let single_index_on col =
|
||||
let rec find n = function
|
||||
| [] -> None
|
||||
| (_, cols) :: tl ->
|
||||
if Array.length cols = 1 && cols.(0) = col then Some n else find (n + 1) tl
|
||||
in
|
||||
find 0 cr.cr_indexes
|
||||
in
|
||||
let simple_key (k : Ast.expr) =
|
||||
match k.Ast.kind with
|
||||
| Ast.Ident n -> n <> q.Ast.q_var
|
||||
| Ast.IntLit _ -> true
|
||||
| _ -> false
|
||||
in
|
||||
let try_side (fe : Ast.expr) (key : Ast.expr) =
|
||||
match fe.Ast.kind with
|
||||
| Ast.Field ({ Ast.kind = Ast.Ident v; _ }, fname) when v = q.Ast.q_var ->
|
||||
let col = col_of fname in
|
||||
if col < 0 || not (simple_key key) then None
|
||||
else if
|
||||
(* exclude Float (kind 6) and Bytes (kind 7) columns *)
|
||||
(match cr.cr_fields.(col) with
|
||||
| _, ft -> (
|
||||
match field_kind p ft with
|
||||
| 6 | 7 -> true
|
||||
| _ -> false))
|
||||
then None
|
||||
else Option.map (fun ino -> (ino, key)) (single_index_on col)
|
||||
| _ -> None
|
||||
in
|
||||
List.fold_left
|
||||
(fun acc w ->
|
||||
match acc with
|
||||
| Some _ -> acc
|
||||
| None -> (
|
||||
match w.Ast.kind with
|
||||
| Ast.Binary (Ast.Eq, a, b) -> (
|
||||
match try_side a b with Some r -> Some r | None -> try_side b a)
|
||||
| _ -> None))
|
||||
None q.Ast.q_wheres
|
||||
|
||||
let field_of (p : pctx) (cid : int) (fname : string) : (int * Ast.field_ty) option =
|
||||
let fs = p.p_classes.(cid).cr_fields in
|
||||
let rec go i = if i >= Array.length fs then None else
|
||||
|
|
@ -2717,9 +2775,23 @@ and emit_query (p : pctx) (f : fstate) (v : views) ~(dst : int) (e : Ast.expr)
|
|||
sync_mask p f v e.id;
|
||||
f.f_cur_line <- e.pos.line;
|
||||
(match q.Ast.q_src with
|
||||
| Ast.QTable _ ->
|
||||
put f (ins_abx op_loadk scan (check_bx p f e.pos "constant" (const_int p cid)));
|
||||
put f (ins_abc op_builtin scan scan b_db_scan)
|
||||
| Ast.QTable _ -> (
|
||||
match probe_key_of_where p q cid with
|
||||
| Some (ino, key_e) ->
|
||||
(* index selection: source = DB_PROBE's candidate ids; every
|
||||
where guard still runs below, so the guard — not the engine —
|
||||
stays the final arbiter of membership *)
|
||||
let save = f.f_temp in
|
||||
let w = alloc_temps p f e.pos 3 in
|
||||
put f (ins_abx op_loadk w (check_bx p f e.pos "constant" (const_int p cid)));
|
||||
put f (ins_abx op_loadk (w + 1) (check_bx p f e.pos "constant" (const_int p ino)));
|
||||
let kr = emit_operand p f v key_e in
|
||||
put f (ins_abc op_move (w + 2) kr 0);
|
||||
put f (ins_abc op_builtin scan w b_db_probe);
|
||||
f.f_temp <- save
|
||||
| None ->
|
||||
put f (ins_abx op_loadk scan (check_bx p f e.pos "constant" (const_int p cid)));
|
||||
put f (ins_abc op_builtin scan scan b_db_scan))
|
||||
| Ast.QNav nav ->
|
||||
(* the navigation (a backlink) already yields a multi of source ids *)
|
||||
let save = f.f_temp in
|
||||
|
|
|
|||
|
|
@ -79,3 +79,28 @@ rather than acknowledging what disk never got.
|
|||
- The update refactor extracted `row_apply_field_slot` (the post-encode
|
||||
half: unique shadow-check, index fix-up, slot swap) shared by both
|
||||
entry points — the VM-value path's behavior is unchanged bit for bit.
|
||||
|
||||
## The read-path index probe (2026-08-22)
|
||||
|
||||
- **wo_idx_probe** (table.c) answers a single-column equality from the
|
||||
index's hash buckets instead of walking slabs — the O(1) wiring the
|
||||
db-bench numbers demanded (reads were ~1.5k ops/s at p50 600µs on 20k
|
||||
rows; ~1.3M ops/s at p50 1µs after). `idx_hash_key1` must reproduce
|
||||
`idx_hash`'s single-column result bit for bit (same FNV over text
|
||||
bytes, same float canonicalization, same position mix) or probes and
|
||||
maintenance disagree on the bucket and rows silently vanish.
|
||||
- The VERIFY step compares exactly as the slab walk compared (raw words
|
||||
for scalars/floats, byte equality for text; nil text == NULL bytes) —
|
||||
the hash canonicalizes only to FIND the bucket, so probe results are
|
||||
identical to scan results by construction.
|
||||
- Composite indexes refuse (return 0) and callers keep the slab walk;
|
||||
both probe executors (`wo_builtin_db` and `wo_db_exec_req`) carry the
|
||||
same wiring, so worker shards get the speedup through the DB actor.
|
||||
- The COMPILER half (emit.ml `probe_key_of_where`): a query whose where
|
||||
list contains `var.col == key` on a single-column-indexed column
|
||||
lowers its source to DB_PROBE; every where guard still runs over the
|
||||
candidates, so the guard — not the engine — stays the final arbiter.
|
||||
Keys are a plain identifier or an integer literal only; Float/Bytes
|
||||
columns excluded (engine raw-eq is narrower than VM float-eq, and a
|
||||
probe miss cannot be resurrected by a recheck). Pinned by
|
||||
`tests/corpus/run/query-index-probe`.
|
||||
|
|
|
|||
|
|
@ -137,6 +137,32 @@ int wo_builtin_db(wo_vm *vm, uint64_t *R, uint32_t ins, const char **msg) {
|
|||
uint32_t col = ix->cols[0];
|
||||
uint8_t kind = db->classes[cid].kinds[col];
|
||||
uint64_t key = R[B + 2];
|
||||
{
|
||||
/* the O(1) path: single-column equality answers from the
|
||||
* index buckets; the slab walk below stays the composite
|
||||
* fallback (wo_idx_probe verifies exactly as it compares) */
|
||||
const void *kb = NULL;
|
||||
uint32_t kl = 0;
|
||||
if (kind == WO_K_TEXT && key) {
|
||||
const wo_str *s = (const wo_str *)(uintptr_t)key;
|
||||
kb = s->data;
|
||||
kl = s->len;
|
||||
}
|
||||
uint64_t *hit = NULL;
|
||||
uint32_t hn = 0;
|
||||
int prc = wo_idx_probe(db, cid, index, key, kb, kl, &hit, &hn);
|
||||
if (prc < 0) return WO_T_OOM;
|
||||
if (prc == 1) {
|
||||
for (uint32_t i = 0; i < hn; i++)
|
||||
if (wo_multi_push(ids, hit[i]) != 0) {
|
||||
free(hit);
|
||||
return WO_T_OOM;
|
||||
}
|
||||
free(hit);
|
||||
R[A] = (uint64_t)(uintptr_t)ids;
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
uint32_t total = t->slab_cnt * DB_SLAB_ROWS;
|
||||
for (uint32_t g = 0; g < total; g++) {
|
||||
if (!(t->bitmap[g >> 6] & (1ull << (g & 63)))) continue;
|
||||
|
|
@ -252,6 +278,24 @@ void wo_db_exec_req(wo_vm *vm, wo_db_req *q) {
|
|||
if (q->op == WO_B_DB_PROBE) {
|
||||
col = t->indexes[q->index].cols[0];
|
||||
kind = db->classes[q->cid].kinds[col];
|
||||
/* the O(1) path, mirroring the local executor: the key is
|
||||
* engine-encoded here (db_text for Text), same buckets,
|
||||
* same verify — worker shards get the identical speedup */
|
||||
const void *kb = NULL;
|
||||
uint32_t kl = 0;
|
||||
if ((kind == WO_K_TEXT || kind == WO_K_BYTES) && q->slots[0]) {
|
||||
const db_text *s = (const db_text *)(uintptr_t)q->slots[0];
|
||||
kb = s->bytes;
|
||||
kl = s->len;
|
||||
}
|
||||
int prc = wo_idx_probe(db, q->cid, q->index, q->slots[0], kb, kl,
|
||||
&q->ids, &q->id_cnt);
|
||||
if (prc < 0) {
|
||||
q->status = WO_T_OOM;
|
||||
q->msg = "out of memory";
|
||||
break;
|
||||
}
|
||||
if (prc == 1) break; /* probed; reply fields already set */
|
||||
}
|
||||
uint32_t total = t->slab_cnt * DB_SLAB_ROWS;
|
||||
for (uint32_t g = 0; g < total; g++) {
|
||||
|
|
|
|||
|
|
@ -319,6 +319,74 @@ static uint64_t idx_hash(const wo_classdesc *c, const db_index *ix, const db_row
|
|||
return h ? h : 1; /* 0 marks an empty bucket */
|
||||
}
|
||||
|
||||
static db_ibucket *idx_bucket(db_index *ix, uint64_t h, int create);
|
||||
|
||||
/* One KEY's bucket hash — must reproduce idx_hash's result for a
|
||||
* single-column index bit for bit (same FNV, same float folding, same
|
||||
* position mix at i == 0), or probes and maintenance disagree on the
|
||||
* bucket and rows silently vanish from reads. */
|
||||
static uint64_t idx_hash_key1(uint8_t kind, uint64_t key_scalar, const void *key_bytes,
|
||||
uint32_t key_len) {
|
||||
uint64_t v;
|
||||
if (kind == WO_K_TEXT) {
|
||||
if (key_bytes) {
|
||||
uint64_t th = 1469598103934665603ull;
|
||||
const uint8_t *p = (const uint8_t *)key_bytes;
|
||||
for (uint32_t b = 0; b < key_len; b++) th = (th ^ p[b]) * 1099511628211ull;
|
||||
v = th;
|
||||
} else
|
||||
v = 0; /* nil text, exactly as idx_hash spells it */
|
||||
} else if (kind == WO_K_FLOAT)
|
||||
v = idx_float_key(key_scalar);
|
||||
else
|
||||
v = key_scalar;
|
||||
uint64_t h = 0x9e3779b97f4a7c15ull;
|
||||
h ^= hmix(v + 0);
|
||||
return h ? h : 1;
|
||||
}
|
||||
|
||||
int wo_idx_probe(wo_db *db, uint32_t class_id, uint32_t index, uint64_t key_scalar,
|
||||
const void *key_bytes, uint32_t key_len, uint64_t **out_ids,
|
||||
uint32_t *out_cnt) {
|
||||
*out_ids = NULL;
|
||||
*out_cnt = 0;
|
||||
if (class_id >= db->class_cnt) return 0;
|
||||
db_table *t = &db->tables[class_id];
|
||||
if (!t->row_size || index >= t->index_cnt) return 0;
|
||||
db_index *ix = &t->indexes[index];
|
||||
if (ix->col_cnt != 1) return 0; /* composite: the caller keeps its scan */
|
||||
uint32_t col = ix->cols[0];
|
||||
uint8_t kind = db->classes[class_id].kinds[col];
|
||||
db_ibucket *b = idx_bucket(ix, idx_hash_key1(kind, key_scalar, key_bytes, key_len), 0);
|
||||
if (!b || !b->len) return 1; /* probed: genuinely empty */
|
||||
uint64_t *ids = malloc((size_t)b->len * 8u);
|
||||
if (!ids) return -1;
|
||||
uint32_t n = 0;
|
||||
for (uint32_t i = 0; i < b->len; i++) {
|
||||
db_row *r = wo_row_ptr(db, class_id, b->ids[i]);
|
||||
if (!r) continue;
|
||||
int eq;
|
||||
if (kind == WO_K_TEXT) {
|
||||
const db_text *have = (const db_text *)(uintptr_t)r->slots[col];
|
||||
eq = (!key_bytes && !have) ||
|
||||
(key_bytes && have && have->len == key_len &&
|
||||
memcmp(have->bytes, key_bytes, key_len) == 0);
|
||||
} else
|
||||
/* raw-word equality for scalars AND floats — the slab walk's
|
||||
* exact comparison, so probe results never differ from scan
|
||||
* results (the hash canonicalized only to FIND the bucket) */
|
||||
eq = r->slots[col] == key_scalar;
|
||||
if (eq) ids[n++] = b->ids[i];
|
||||
}
|
||||
if (!n) {
|
||||
free(ids);
|
||||
return 1;
|
||||
}
|
||||
*out_ids = ids;
|
||||
*out_cnt = n;
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int idx_cols_equal(const wo_classdesc *c, const db_index *ix, const db_row *a,
|
||||
const db_row *b) {
|
||||
for (uint32_t i = 0; i < ix->col_cnt; i++) {
|
||||
|
|
|
|||
|
|
@ -187,6 +187,24 @@ void wo_db_val_free(wo_db *db, uint8_t kind, uint64_t v);
|
|||
uint64_t wo_val_decode_vm(wo_db *db, wo_rt *rt, uint8_t kind, uint64_t engine_val,
|
||||
int *ok, const char **msg);
|
||||
|
||||
/* Read-path index probe (the O(1) wiring): answer a SINGLE-COLUMN
|
||||
* equality from the index's hash buckets instead of walking slabs.
|
||||
* Key representation is caller-neutral so wo_str and db_text callers
|
||||
* both fit: a Text key passes its bytes+len (bytes == NULL means nil;
|
||||
* an empty text is a non-NULL pointer with len 0); any scalar/float
|
||||
* key passes the raw word in [key_scalar] (bytes ignored). The bucket
|
||||
* hash canonicalizes floats exactly as index maintenance does; the
|
||||
* VERIFY step then compares exactly as the slab walk compares (raw
|
||||
* words for scalars/floats, byte equality for text) — a hash is a
|
||||
* hint, never an answer, so results are identical to the scan.
|
||||
* Returns 1 = probed (*out_ids is a malloc'd id list of *out_cnt,
|
||||
* possibly NULL/0 — the caller frees), 0 = cannot probe (unknown
|
||||
* class/index, untouched table, or a multi-column index — the caller
|
||||
* keeps its scan fallback), -1 = OOM. */
|
||||
int wo_idx_probe(wo_db *db, uint32_t class_id, uint32_t index, uint64_t key_scalar,
|
||||
const void *key_bytes, uint32_t key_len, uint64_t **out_ids,
|
||||
uint32_t *out_cnt);
|
||||
|
||||
/* Engine-internal, replay only: after wal.c fills a raw row's slots, this
|
||||
* runs the index maintenance the normal insert runs inline — including the
|
||||
* unique check, whose violation during replay is corruption, not data
|
||||
|
|
|
|||
|
|
@ -45,19 +45,24 @@ slice.
|
|||
|
||||
`bench/baseline.json` is the contract; headline readings:
|
||||
|
||||
- ram seed 257–298k inserts/s; **durable seed ≈4.5k/s** (fsync-per-commit
|
||||
- ram seed 245–290k inserts/s; **durable seed ≈4.5k/s** (fsync-per-commit
|
||||
≈220µs each — the gap iteration 23 exists to close).
|
||||
- reads ≈1.5k/s at p50 ≈600µs on a 20k-row store: point lookups are
|
||||
O(table) — the probe walks every slab; index selection never reaches
|
||||
the lookup path. THE read-path finding.
|
||||
- mixread 1,280 ops/s single-shard vs **21 ops/s** multi-shard: RPC
|
||||
round-trip × O(table) probes × owner serialization — the arc's honest
|
||||
price until reads index properly.
|
||||
- msgrate 13.4M msgs/s same-heap vs 2.45M cross-shard (the mutex-inbox
|
||||
- reads/queries ≈1.1–1.3M ops/s at p50 1µs since the read-path index
|
||||
slice (2026-08-22, engine `wo_idx_probe` + emitter index selection) —
|
||||
up from ≈1.5k/s at p50 600µs when point lookups walked every slab
|
||||
(~×850). mixread 89k ops/s single-shard, ~1.9k multi-shard (was
|
||||
1,280 / 21): the RPC round-trip is now the visible cost, as designed.
|
||||
- msgrate ≈13M msgs/s same-heap vs ≈2.4M cross-shard (the mutex-inbox
|
||||
number, stage-2 deviation 4).
|
||||
- Tolerance policy lives in the DRIVER (`tolerance_for`), not hand-edits
|
||||
— a baseline refresh regenerates it: mix*/sN/read/query 50%
|
||||
(scheduling + µs-scale jitter), rest 15%; latency floors
|
||||
`max(4×value, 100µs)` — the tripwire means "µs became ms".
|
||||
|
||||
## The gate must bite (proven 2026-08-21)
|
||||
|
||||
`scripts/db-bench.py --check <results.json>` evaluates a recorded run:
|
||||
the real results pass 74/0; a doctored copy (one ops/sec halved) FAILS
|
||||
on exactly that metric. Re-run the smoke after any gate change.
|
||||
the real results pass 74/0; a doctored copy FAILS on exactly the
|
||||
doctored metrics — use a 15%-class metric (seed) halved plus a
|
||||
50%-class metric (read) quartered, so both tolerance classes prove they
|
||||
bite. Re-run the smoke after any gate or policy change.
|
||||
|
|
|
|||
|
|
@ -90,3 +90,15 @@ Acceptance shape for that slice: db-bench `read`/`query` move from
|
|||
~1.5k ops/s to the same order as inserts; `bench/baseline.json`
|
||||
refreshed with the delta recorded — the gate exists precisely so this
|
||||
claim gets measured.
|
||||
|
||||
**LANDED 2026-08-22** — and the study missed half the gap: the engine
|
||||
probe was only ever emitted for BACKLINK navigation; a `where
|
||||
var.col == key` query lowered to DB_SCAN + a per-row VM filter loop.
|
||||
The slice therefore wired BOTH layers: `wo_idx_probe` in the engine
|
||||
(bucket lookup + scan-identical verify; composite indexes keep the
|
||||
walk) and index selection in the emitter (`probe_key_of_where` — the
|
||||
where guards still run over the candidates, so the guard stays the
|
||||
final arbiter). Measured: reads 1,336 → 1,336,362 ops/s (p50 599µs →
|
||||
1µs), query ×830, mixread ×70, single-shard, N=20k. Pinned by
|
||||
`tests/corpus/run/query-index-probe` and a `wo_idx_probe` unit suite in
|
||||
`runtime/test/test_table.c`.
|
||||
|
|
|
|||
69
docs/plan/perf-targets.md
Normal file
69
docs/plan/perf-targets.md
Normal file
|
|
@ -0,0 +1,69 @@
|
|||
# Performance targets — measured, named, waiting
|
||||
|
||||
A register like [`discarded.md`](discarded.md)/[`learnings.md`](learnings.md):
|
||||
optimization candidates that exist because a NUMBER says so, not a
|
||||
hunch. Every row cites its measurement (the db-bench campaign,
|
||||
`bench/baseline.json`, or the [go-sqlite comparison](../../bench/compare/go-sqlite/README.md))
|
||||
and names an owner iteration when one exists. A target leaves this file
|
||||
by landing (delta recorded in the baseline) or by being rejected into
|
||||
`discarded.md` with its reason.
|
||||
|
||||
## 1. The write path — update-through-query re-probes, insert re-encodes
|
||||
|
||||
**Measured 2026-08-22** (go-sqlite comparison, N=20k, same machine,
|
||||
ext4): ram mixed writes 195,465 ops/s vs SQLite's 380,069 (×1.9
|
||||
behind); durable mixed writes 2,324 vs 3,257 (×1.4 behind) — while
|
||||
writeonce WINS durable seed ×1.4 and reads ×2.6–6.4. The write gap is
|
||||
specifically the UPDATE half of the mix.
|
||||
|
||||
Suspected costs, in probable order (attribute before optimizing — the
|
||||
C-API microbench the 22 spec reserves exists for exactly this):
|
||||
|
||||
1. **Update-through-query runs a whole query statement per update**:
|
||||
probe (now O(1)) + materialize an id `multi` (arena alloc) +
|
||||
`DB_GET_FIELD`/`DB_UPDATE_FIELD` builtin round-trips per touched
|
||||
field. SQLite's equivalent is one page write inside one statement.
|
||||
2. **`wo_row_update_field` walks every index three times** (shadow
|
||||
unique check, old-entry removal, new-entry add — three
|
||||
`touches`-loops over `t->indexes` per update; see
|
||||
`database/src/table.c`).
|
||||
3. **Insert encodes per field with a malloc per text/owned value**
|
||||
(`db_val_encode`) — visible as ram seed ×1.2 behind SQLite (245k vs
|
||||
297k) even though the durable flavor wins.
|
||||
4. **A WAL update record re-encodes the whole row**
|
||||
(`wo_wal_append_update` writes the row image, not a delta).
|
||||
|
||||
**Owner:** none yet. Sequence note: iteration 23 (io_uring
|
||||
group-commit) rewrites the durable write path's syscall story anyway —
|
||||
re-measure after 23 lands, then decide whether the RAM-side costs
|
||||
(1–3) earn their own slice. Acceptance shape: ram write ops/s closes
|
||||
on SQLite's number with reads unharmed; baseline refreshed with the
|
||||
delta recorded.
|
||||
|
||||
## 2. Cross-shard DB RPC halves concurrent read throughput
|
||||
|
||||
**Measured 2026-08-22** (db-bench campaign): ram mixread 89,538 ops/s
|
||||
single-shard vs 44,918 at default cores; durable 9,211 vs 4,324. The
|
||||
DB actor serializes every statement on shard 0 and each op pays an
|
||||
envelope + park/unpark round-trip.
|
||||
|
||||
**Owner: by design, priced deliberately** (story 8's settled decision
|
||||
1 — rejected alternatives: engine lock, partitioned tables "wait for a
|
||||
measured need"). THIS is the measured need's first data point; the
|
||||
recorded escalation path is partitioned/replicated read state, only if
|
||||
a real workload (iteration 24's chat) hurts. Not actionable before 24.
|
||||
|
||||
## 3. The mutex inbox costs ~6× on cross-shard message rate
|
||||
|
||||
**Measured 2026-08-22**: 16.7M msgs/s same-heap vs 2.85M cross-shard
|
||||
(`msgrate`). **Owner: iteration 31** (mailbox/backpressure decisions
|
||||
consume this number) and stage-2 deviation 4 (lock-free rings arrive
|
||||
only if the mutex is the measured bottleneck — at 2.85M msgs/s it is
|
||||
not the limiting factor for any current workload).
|
||||
|
||||
## 4. Durable write throughput is fsync-bound at ~4.5k/s
|
||||
|
||||
**Measured 2026-08-21**: durable seed 4,460 inserts/s vs ram 245k —
|
||||
the ~55× gap is one fdatasync per statement (~220µs each).
|
||||
**Owner: iteration 23** (io_uring group-commit) — its acceptance is
|
||||
literally this number moving while the crash battery stays green.
|
||||
|
|
@ -49,11 +49,18 @@ repeatability check) + `just db-bench`/`db-bench-quick`; `time.ticks`
|
|||
proof + 3× kill -9 battery per shard count all green; the gate bites
|
||||
(doctored results fail on exactly the doctored metric).
|
||||
|
||||
**Landed 2026-08-22 — the read-path index slice** (born from the
|
||||
postgres study + 22's numbers, commit 6a306a7): engine `wo_idx_probe`
|
||||
(bucket lookup, scan-identical verify) + emitter index selection
|
||||
(`where var.col == key` lowers to DB_PROBE; guards stay the arbiter).
|
||||
Reads 1.3k → **1.3M ops/s**, p50 600µs → 1µs (~×850); mixread 21 →
|
||||
~1.9k ops/s multi-shard. Baseline refreshed; tolerance policy moved
|
||||
into the driver (refresh-proof); gate proven to bite on both classes.
|
||||
Pinned by corpus `query-index-probe` + a `wo_idx_probe` unit suite.
|
||||
|
||||
**Key findings (measured, not asserted):** durable seed ≈4.5k
|
||||
inserts/s vs ram ≈297k/s — the 66× fsync gap IS iteration 23's case;
|
||||
point lookups are O(table) (the probe walks every slab — reads ≈1.5k/s
|
||||
at p50 ≈600µs on 20k rows): the read path never uses the index for
|
||||
lookup, a new candidate slice; mixread 1,280 ops/s single-shard vs 21
|
||||
point lookups WERE O(table) (fixed 2026-08-22, above); mixread was 1,280 ops/s single-shard vs 21
|
||||
ops/s multi-shard — the DB-actor price under O(table) probes and owner
|
||||
serialization; msgrate 13.4M msgs/s same-heap vs 2.45M cross-shard —
|
||||
deviation 4's mutex-inbox number (rings stay unearned until this is
|
||||
|
|
@ -235,6 +242,9 @@ that sequences its tasks. Read one, approve, then the next starts.
|
|||
| 24 | [chat: WebSocket workload](language-runtime-database/refine/24-chat-websocket-workload.md) | ⬜ fourth in chain — the arc's acceptance; after 31 |
|
||||
| 23 | [io_uring group-commit](language-runtime-database/refine/23-io-uring-commit.md) | ⬜ fifth in chain, after stage 3 + 22 |
|
||||
| 32 | [WAL checkpoint](language-runtime-database/refine/32-wal-checkpoint.md) | ⬜ last in chain, after 23 — disk reclamation + bounded replay (story written 2026-08-21) |
|
||||
| 33 | [Single-file store](language-runtime-database/refine/33-single-file-db.md) | ⬜ off-chain, small — `WO_DATA=<path>.db` file form; driver-only (story written 2026-08-22) |
|
||||
| 34 | [Crypto builtins](language-runtime-database/refine/34-crypto-builtins.md) | ⬜ off-chain but GATES 24 (WS handshake needs SHA-1) — digests + HMAC as vector-verified C builtins (story written 2026-08-22) |
|
||||
| 35 | [net runtime seams](language-runtime-database/refine/35-net-runtime-seams.md) | ⬜ off-chain — fd deadlines on the park plane, Unix sockets, peer address; owns the ledger's three 🔧 rows (story written 2026-08-22) |
|
||||
| 20 | [Cross-program tables](language-runtime-database/hold/20-cross-program-tables.md) | ⏸ hold (2026-08-21); channel done (branch ipc-attach keeps its manifest) |
|
||||
| 21 | [Keypair attach auth](language-runtime-database/hold/21-keypair-attach-auth.md) | ⏸ hold (2026-08-21); crypto+handshake done (branch keypair-auth keeps its manifest) |
|
||||
| 25 | [HTTP service layer](../superpowers/plans/2026-08-01-http-service-layer.md) | ⏸ hold (2026-08-21) — story file removed; the plan doc remains |
|
||||
|
|
@ -422,6 +432,11 @@ The C proving-ground work (`exploration/c-runtime/`, phases A–F: 859k reads/s,
|
|||
|
||||
## Pending
|
||||
|
||||
Measured optimization candidates live in
|
||||
[`docs/plan/perf-targets.md`](../plan/perf-targets.md) — a register
|
||||
like discarded/learnings: a target enters with a number, leaves by
|
||||
landing (baseline delta) or by rejection into discarded.md.
|
||||
|
||||
### Implementation order (re-sequenced 2026-08-21 — concurrency chain)
|
||||
|
||||
Everything still pending IS the runtime-concurrency chain. Basis: the
|
||||
|
|
|
|||
|
|
@ -107,14 +107,17 @@ still pending IS the runtime-concurrency chain; order:
|
|||
| 18 | 24 | [chat: WebSocket workload](refine/24-chat-websocket-workload.md) | the arc's acceptance: WS upgrade + frames (SHA-1 via crypto fork, Bytes via 19), rooms/broadcast, 1k clients, drain-clean. *(was 19)* |
|
||||
| 19 | 23 | [io_uring group-commit](refine/23-io-uring-commit.md) | WAL WRITE+FSYNC chains on the arc's per-shard rings; fsync fallback kept (after 22 + the arc). *(was 9f)* |
|
||||
| 20 | 32 | [WAL checkpoint](refine/32-wal-checkpoint.md) | **NEW 2026-08-21** (stage-3 guarantee refinement found the hole) — the WAL is append-only forever: snapshot + truncate reclaims disk and bounds replay time; every durability guarantee byte-identical; crash mid-checkpoint recovers from the previous snapshot + full tail. After 23 (composes with group-commit); RAM slot-reuse already contracted in `04-db-binding.md`. |
|
||||
| 21 | 25 | [HTTP service layer](../../superpowers/plans/2026-08-01-http-service-layer.md) | `service` blocks lower onto the framework (after 9b + 20 by their own precedence notes). **HELD 2026-08-21** — story file removed; the plan doc remains. *(was 10)* |
|
||||
| 22 | 18 | [framework v2: memory-rich features](hold/18-memory-db-features.md) | spec+plan approved: TTL cache, @table flags, durable job queue, `transaction { }` over the WAL's staged batch. **Demoted from seq 14**: more surface on a framework with one consumer, and the cache still stores `Text` because there are no generics |
|
||||
| 23 | 27 | [Query grammar corpus](hold/27-query-grammar-corpus.md) | grow the query grammar from real corpora; likely collapses to "confirm `len(query)` + add `exists`"; precedes 28. *(was 9g)* |
|
||||
| 24 | 26 | [Blue-green deploy](hold/26-blue-green-deploy.md) | two VM slots, in-runtime compile, atomic switch, resident rollback (plan authored after 9 + 25). *(was 12)* |
|
||||
| 25 | 20 | [Cross-program tables](hold/20-cross-program-tables.md) | attach to a running program's database over local IPC; owner stays the single writer (channel half-built). **Demoted from seq 16**: new distribution surface while there is no TLS, no crypto, and the multi-shard DB still traps. *(was 9c)* |
|
||||
| 26 | 21 | [Keypair attach auth](hold/21-keypair-attach-auth.md) | program identity is a keypair; mutual challenge–response at attach (crypto half-built; plan folds into 20's). **Demoted with 20** — and it needs crypto primitives that do not exist. *(was 9d)* |
|
||||
| 27 | 28 | [skillhost host workload](hold/28-skillhost-host-workload.md) | host-shaped driving workload naming runtime gaps — demoted with the framework goal. *(was 14)* |
|
||||
| 28 | 29 | [Compile-time metaprogramming](hold/29-compile-time-metaprogramming.md) | `@derive(...)` from class-table metadata; held with the parked drain by the 2026-08-08 scope directive. *(was 13)* |
|
||||
| 21 | 33 | [Single-file store](refine/33-single-file-db.md) | **NEW 2026-08-22** — `WO_DATA=<path>.db`: a file path IS the wal (the store already lives in exactly one file; this makes the surface say so). Driver-only, independent of the chain; composes with 32's rename-swap. |
|
||||
| 22 | 34 | [Crypto builtins](refine/34-crypto-builtins.md) | **NEW 2026-08-22** — SHA-1/SHA-256/HMAC-SHA256 as C builtins over Bytes (no bitwise ops in the language, hand-rolled per doctrine, vector-verified). GATES 24's WS handshake; digest floor for held 21 and the ETag row. |
|
||||
| 23 | 35 | [net runtime seams](refine/35-net-runtime-seams.md) | **NEW 2026-08-22** — the ledger's three 🔧 rows owned: fd deadlines composing with the park plane, Unix-socket listeners, peer address (trusted-proxy check). Framework knobs stay framework slices; pairs naturally with 24 (dead-client eviction). |
|
||||
| 24 | 25 | [HTTP service layer](../../superpowers/plans/2026-08-01-http-service-layer.md) | `service` blocks lower onto the framework (after 9b + 20 by their own precedence notes). **HELD 2026-08-21** — story file removed; the plan doc remains. *(was 10)* |
|
||||
| 25 | 18 | [framework v2: memory-rich features](hold/18-memory-db-features.md) | spec+plan approved: TTL cache, @table flags, durable job queue, `transaction { }` over the WAL's staged batch. **Demoted from seq 14**: more surface on a framework with one consumer, and the cache still stores `Text` because there are no generics |
|
||||
| 26 | 27 | [Query grammar corpus](hold/27-query-grammar-corpus.md) | grow the query grammar from real corpora; likely collapses to "confirm `len(query)` + add `exists`"; precedes 28. *(was 9g)* |
|
||||
| 27 | 26 | [Blue-green deploy](hold/26-blue-green-deploy.md) | two VM slots, in-runtime compile, atomic switch, resident rollback (plan authored after 9 + 25). *(was 12)* |
|
||||
| 28 | 20 | [Cross-program tables](hold/20-cross-program-tables.md) | attach to a running program's database over local IPC; owner stays the single writer (channel half-built). **Demoted from seq 16**: new distribution surface while there is no TLS, no crypto, and the multi-shard DB still traps. *(was 9c)* |
|
||||
| 29 | 21 | [Keypair attach auth](hold/21-keypair-attach-auth.md) | program identity is a keypair; mutual challenge–response at attach (crypto half-built; plan folds into 20's). **Demoted with 20** — and it needs crypto primitives that do not exist. *(was 9d)* |
|
||||
| 30 | 28 | [skillhost host workload](hold/28-skillhost-host-workload.md) | host-shaped driving workload naming runtime gaps — demoted with the framework goal. *(was 14)* |
|
||||
| 31 | 29 | [Compile-time metaprogramming](hold/29-compile-time-metaprogramming.md) | `@derive(...)` from class-table metadata; held with the parked drain by the 2026-08-08 scope directive. *(was 13)* |
|
||||
| ✅ | 17 | [library projects + `internal/`](done/17-library-projects-internal.md) | **LANDED 2026-08-20** — `kind = "library"` + entry-less check mode (retires the `--emit` workaround) and Go's `internal/` rule as WO-E108 at the consumer's `use`; driver-only, VM/GC untouched. `just web-app` 26/0 |
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,73 @@
|
|||
---
|
||||
iteration: "33"
|
||||
status: refine
|
||||
---
|
||||
|
||||
# Iteration 33 — `WO_DATA=<path>.db`: the persistent store as one file
|
||||
|
||||
> Format: `product/story-iteration-template`. Part of
|
||||
> [Story — one language, one runtime, one database, one binary](../00-story.md).
|
||||
>
|
||||
> **Inserted 2026-08-22** (developer ask: "can the persistent db be in
|
||||
> file.db form?"). The truth is already almost there: `WO_DATA=<dir>`
|
||||
> holds exactly ONE file (`shard-0.wal`) — the entire persistent state,
|
||||
> since RAM is authoritative and no data pages exist. This iteration
|
||||
> makes the surface say so: point `WO_DATA` at a file and THAT file is
|
||||
> the store. Small, driver-only, independent of the concurrency chain.
|
||||
|
||||
## Goals
|
||||
|
||||
- **`WO_DATA=<path>` accepts a file path.** A path that is not an
|
||||
existing directory is treated as THE wal file (`app.db`,
|
||||
`store.wo.db` — the name is the operator's). The directory form stays
|
||||
and keeps meaning `<dir>/shard-0.wal` — every existing deployment and
|
||||
gate is byte-identical.
|
||||
- **One file remains the whole truth at any core count** — stage 3 made
|
||||
the WAL owner-shard-only (shard 0 is the sole writer), so nothing
|
||||
multi-shard ever adds a second file.
|
||||
- **The contract says it out loud**: `04-db-binding.md` documents the
|
||||
file form, and documents honestly that the file is an append-only log
|
||||
that grows until iteration 32 lands.
|
||||
|
||||
## Acceptance Criteria
|
||||
|
||||
- **Given** `WO_DATA=/tmp/app.db` (no such directory), **when** a
|
||||
program seeds, restarts, and verifies, **then** replay is byte-true
|
||||
and `/tmp/app.db` is the only artifact on disk.
|
||||
- **Given** `WO_DATA=<dir>` (existing directory), **when** the same
|
||||
program runs, **then** behavior is byte-identical to today —
|
||||
`<dir>/shard-0.wal`, every standing gate unchanged.
|
||||
- **Given** the db-bench durability legs pointed at the file form,
|
||||
**when** the restart proof and kill -9 battery run, **then** every
|
||||
guarantee holds identically (the file IS the same WAL, only named by
|
||||
the operator).
|
||||
|
||||
## Out Of Scope
|
||||
|
||||
- A paged database file (SQLite's shape) — RAM is authoritative; the
|
||||
disk story is the WAL, full stop.
|
||||
- Checkpoint/compaction — [iteration 32](32-wal-checkpoint.md)'s; its
|
||||
rename-swap (write snapshot+tail to a NEW file, fsync, `rename()`
|
||||
over the old) is exactly what keeps the single-file promise crash-safe
|
||||
when it lands. 33 before or after 32 works; landing 33 first means
|
||||
32's spec inherits the file form as a stated constraint.
|
||||
- Multiple stores per process, attach-by-file — held iteration 20's
|
||||
territory.
|
||||
|
||||
## Info
|
||||
|
||||
- The whole change is `runtime/src/main.c`'s hardcoded
|
||||
`snprintf("%s/shard-0.wal", dir)` growing a stat-based fork
|
||||
(directory → today's path; otherwise → the path itself), plus a gate
|
||||
check and the binding-doc note. No engine, no WAL format, no
|
||||
compiler.
|
||||
- Fork for the (tiny) spec: what does a NONEXISTENT path mean? Leaning:
|
||||
a path whose parent exists and that does not end in `/` is a file to
|
||||
create; a trailing `/` or existing directory keeps the directory
|
||||
form. Refusing ambiguity loudly (WO exit 2) beats guessing.
|
||||
|
||||
## Proposed Solution
|
||||
|
||||
Small enough for a bounded slice: brainstorm the one fork in chat,
|
||||
implement driver + db-bench file-form leg + docs in one pass, gates
|
||||
green. No plan document needed unless it grows.
|
||||
|
|
@ -0,0 +1,101 @@
|
|||
---
|
||||
iteration: "34"
|
||||
status: refine
|
||||
---
|
||||
|
||||
# Iteration 34 — crypto builtins: digests and HMAC in the runtime
|
||||
|
||||
> Format: `product/story-iteration-template`. Part of
|
||||
> [Story — one language, one runtime, one database, one binary](../00-story.md).
|
||||
>
|
||||
> **Inserted 2026-08-22** — the framework ledger's oldest unowned gap
|
||||
> gets an owner. The language has NO bitwise operators (a settled
|
||||
> surface decision), so digests cannot be written in `.wo`; the
|
||||
> ledger's recorded resolution stands: hand-rolled C builtins in the
|
||||
> runtime — the libc-only doctrine permits hand-rolled crypto, and the
|
||||
> code is bounded and well-specified. Off the concurrency chain but
|
||||
> **gates chain position 4**: iteration 24's WebSocket handshake needs
|
||||
> SHA-1 before chat can land.
|
||||
|
||||
## Why this iteration exists
|
||||
|
||||
Four consumers already wait on it, none able to proceed:
|
||||
[iteration 24](24-chat-websocket-workload.md)'s upgrade handshake
|
||||
(`Sec-WebSocket-Accept` = base64(SHA-1(key + GUID)) — SHA-1
|
||||
specifically, not a choice); the framework's ETag/conditional-request
|
||||
row (wants a content hash); HMAC-signed tokens the auth core can grow;
|
||||
and held [iteration 21](../hold/21-keypair-attach-auth.md), whose
|
||||
challenge–response needs primitives that "do not exist" (its demotion
|
||||
note). Bytes and base64 landed with iteration 19 — the carriers exist,
|
||||
only the digests are missing.
|
||||
|
||||
## Goals
|
||||
|
||||
- **Digest builtins over Bytes**: SHA-1 (the WS handshake's hard
|
||||
requirement), SHA-256 (the modern default for ETag/HMAC), each
|
||||
`Bytes -> Bytes`, streaming not required (whole-value, like every
|
||||
existing builtin).
|
||||
- **HMAC-SHA256** (`key: Bytes, msg: Bytes -> Bytes`) — the one
|
||||
composition real services need (signed tokens, webhook signatures);
|
||||
writing HMAC in `.wo` is impossible for the same no-bitwise reason.
|
||||
- **Test vectors are the acceptance**: FIPS 180 / RFC 2202 / RFC 4231
|
||||
vectors in a corpus fixture — a digest that "looks right" is worth
|
||||
nothing.
|
||||
- **The contract doc row**: names, arities, Bytes-in/Bytes-out, and the
|
||||
explicit note that SHA-1 exists for protocol compatibility (WS), not
|
||||
for new designs.
|
||||
|
||||
## Acceptance Criteria (draft — the spec refines)
|
||||
|
||||
- **Given** the published test vectors for SHA-1, SHA-256, and
|
||||
HMAC-SHA256, **when** the corpus fixture runs them through the
|
||||
builtins, **then** every output matches byte-for-byte (via the
|
||||
existing base64/Bytes surface).
|
||||
- **Given** the WS handshake's worked example from RFC 6455
|
||||
(`dGhlIHNhbXBsZSBub25jZQ==` → `s3pPLMBiTxaQ9kYGzzhZRbK+xOo=`),
|
||||
**when** composed in pure `.wo` from `sha1` + `base64_encode`,
|
||||
**then** the exact accept token comes out — iteration 24's handshake
|
||||
is provably one expression away.
|
||||
- **Given** the full battery, **when** it runs, **then** nothing
|
||||
regresses — new builtin ids only, no opcode, no `.wob` version bump
|
||||
(the iteration-19/`time.ticks` precedent).
|
||||
|
||||
## Out Of Scope
|
||||
|
||||
- Asymmetric crypto (ed25519 signatures/keypairs) — held iteration 21's
|
||||
spec decides what it needs when it unholds; this iteration lays the
|
||||
digest floor it will stand on.
|
||||
- TLS — permanently the proxy's job (framework doctrine).
|
||||
- CRC32 — the ledger lists it, but no consumer is blocked on it; it
|
||||
joins only if 24's spec finds a real need (rejecting speculative
|
||||
surface).
|
||||
- A password-hashing story (bcrypt/argon2) — no workload asks yet.
|
||||
- Bitwise operators in the language — a separate, bigger surface
|
||||
decision this iteration deliberately routes around.
|
||||
|
||||
## Info
|
||||
|
||||
Forks the spec must settle:
|
||||
|
||||
1. **The namespace.** The reserved stdlib namespaces are exactly
|
||||
`fs`/`proc`/`net`/`time`/`json`/`env` (compiler-enforced list) — a
|
||||
new `crypto` namespace touches that list plus the typechecker
|
||||
table, or the functions ride an existing namespace. Leaning: a real
|
||||
`crypto` namespace (the list exists to be grown deliberately; this
|
||||
is deliberate).
|
||||
2. **Surface shape**: `crypto.sha1(b: Bytes) -> Bytes`,
|
||||
`crypto.sha256(b: Bytes) -> Bytes`,
|
||||
`crypto.hmac_sha256(key: Bytes, msg: Bytes) -> Bytes` — Text
|
||||
convenience overloads rejected (the caller has `bytes_of_text`).
|
||||
3. **Implementation source**: hand-rolled C from the FIPS pseudocode
|
||||
(~200 lines for both digests; well-trodden, vector-verified) — the
|
||||
doctrine's shape. No linking against OpenSSL, ever.
|
||||
4. **Where the code lives**: `runtime/src/crypto.c` beside sysio, or
|
||||
inside builtin.c — file layout, the executor decides.
|
||||
|
||||
## Proposed Solution
|
||||
|
||||
Brainstorm → (small) spec settling the four forks → implement with the
|
||||
`time.ticks` slice's shape (ids, one table row per compiler surface,
|
||||
contract-doc rows, vector fixtures). Lands any time before iteration
|
||||
24's spec; independent of 31/22/23.
|
||||
|
|
@ -0,0 +1,107 @@
|
|||
---
|
||||
iteration: "35"
|
||||
status: refine
|
||||
---
|
||||
|
||||
# Iteration 35 — `net` runtime seams: timeouts, Unix sockets, peer address
|
||||
|
||||
> Format: `product/story-iteration-template`. Part of
|
||||
> [Story — one language, one runtime, one database, one binary](../00-story.md).
|
||||
>
|
||||
> **Inserted 2026-08-22** — the framework ledger's three 🔧 rows get one
|
||||
> owner: "Read/write/idle timeouts — `net` has no timeout surface",
|
||||
> "Unix socket binding — `net.listen` is TCP-only", and "Trusted-proxy
|
||||
> client IP — needs a peer-address runtime seam". Each is a small
|
||||
> builtin-surface addition; the framework knobs built ON them stay
|
||||
> framework slices. Off the concurrency chain; no chain item depends on
|
||||
> it, but a production-shaped deployment (proxy in front, sockets not
|
||||
> ports, slow-client defense) needs all three.
|
||||
|
||||
## Why this iteration exists
|
||||
|
||||
The framework cannot defend against a slow client (no read deadline —
|
||||
one stalled socket parks a fiber forever), cannot sit behind a
|
||||
same-host proxy the idiomatic way (Unix socket beats a loopback port),
|
||||
and cannot TRUST `X-Forwarded-For` (parsing is expressible in `.wo`
|
||||
today, but verifying the peer actually IS the proxy needs the peer's
|
||||
address, which no builtin exposes). All three are runtime seams by
|
||||
nature: the information or mechanism lives at the fd level.
|
||||
|
||||
## Goals
|
||||
|
||||
- **Deadlines on parked net I/O.** A read/accept/write that would park
|
||||
can carry a deadline; expiry resumes the fiber with a distinguishable
|
||||
timeout result (nil-or-trap decided by the spec, consistent with the
|
||||
stdlib's nil-vs-trap contracts). On serving shards this composes with
|
||||
the existing plane — a park is ALREADY a POLL_ADD or TIMEOUT
|
||||
submission (arc T4); the seam arms both and takes whichever fires.
|
||||
Program mode gets the same surface over blocking syscalls.
|
||||
- **Unix-domain listeners and connections** beside the TCP ones — same
|
||||
accept/read/write/close builtins afterward (an fd is an fd; only the
|
||||
bind/connect shape differs).
|
||||
- **The peer's address, readable** — for an accepted connection, enough
|
||||
to answer "is this my trusted proxy?" (address + family; port where
|
||||
meaningful). The framework's trusted-proxy middleware then becomes a
|
||||
pure-`.wo` candidate slice.
|
||||
- **The framework knobs are explicitly NOT here** — timeout defaults,
|
||||
proxy allowlists, socket-path config all live in framework slices
|
||||
that consume these seams.
|
||||
|
||||
## Acceptance Criteria (draft — the spec refines)
|
||||
|
||||
- **Given** a fiber reading a socket whose peer sends nothing, **when**
|
||||
the declared deadline expires, **then** the fiber resumes with the
|
||||
timeout result (never a hang), other fibers having run throughout
|
||||
(TID-verified), and the fd is still usable or cleanly closed per the
|
||||
spec's stated semantics.
|
||||
- **Given** a listener on a Unix socket path, **when** a client
|
||||
connects and exchanges bytes, **then** the whole existing net surface
|
||||
works unchanged over it, and the log-watcher/web-app gates stay
|
||||
byte-identical on TCP.
|
||||
- **Given** an accepted connection, **when** the handler asks for the
|
||||
peer address, **then** loopback TCP and Unix-socket peers are both
|
||||
identifiable, and the answer round-trips into the trusted-proxy
|
||||
check's comparison.
|
||||
- **Given** the full battery plus a soak with deliberately stalled
|
||||
clients, **when** it runs, **then** zero leaked fds and flat RSS —
|
||||
timeouts must CLEAN UP, not merely return.
|
||||
|
||||
## Out Of Scope
|
||||
|
||||
- Framework policy (default timeout values, proxy allowlist shape,
|
||||
keep-alive idle policy) — framework slices on top.
|
||||
- TLS, h2c — unchanged owners (proxy; parked behind 23).
|
||||
- Connect-side timeouts for outbound clients beyond what the deadline
|
||||
seam gives free — no workload asks yet.
|
||||
- Cancellation as a general mechanism — iteration 31's
|
||||
request/response + timers own actor-level cancellation; this is
|
||||
strictly fd-level deadlines.
|
||||
|
||||
## Info
|
||||
|
||||
Forks the spec must settle:
|
||||
|
||||
1. **Timeout result shape**: nil result vs a distinguishable trap —
|
||||
must follow the stdlib's existing nil-vs-trap doctrine
|
||||
(`07`-series contracts; a timeout is an EXPECTED outcome, which
|
||||
argues nil).
|
||||
2. **Deadline plumbing on the plane**: one park may need BOTH a
|
||||
POLL_ADD and a TIMEOUT in flight (io_uring linked ops vs two
|
||||
submissions + first-wins cancel; epoll fallback = the existing
|
||||
deadline scan). The park protocol contract
|
||||
([`03-concurrency-coroutines.md`](../../../plan/oop-vm/03-concurrency-coroutines.md))
|
||||
gains the rule.
|
||||
3. **Surface shape**: per-call deadline argument vs per-fd setting
|
||||
(`net.set_deadline(fd, ms)`); leaning per-call — no hidden fd state,
|
||||
matches the no-coloring doctrine.
|
||||
4. **Unix-socket path semantics**: unlink-before-bind? stale-socket
|
||||
handling on restart (the never-stopping-runtime doctrine says a
|
||||
restart must not need manual cleanup).
|
||||
|
||||
## Proposed Solution
|
||||
|
||||
Brainstorm → small spec settling the four forks → implement in the
|
||||
`time.ticks`/34 shape (builtin ids + park.c deadline arming + contract
|
||||
rows + fixtures incl. a stalled-client corpus case). Independent of the
|
||||
chain; natural pairing is right before or with iteration 24 (chat wants
|
||||
read deadlines for dead-client eviction even before lifecycle timers).
|
||||
|
|
@ -2,6 +2,7 @@
|
|||
* Round-trips across kinds, nil encodings, id interleave across shards,
|
||||
* slab growth past one slab, slot reuse after removal, and the out-gate
|
||||
* invariant (a read hands back FRESH VM values, never slab pointers). */
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
#include "cont.h"
|
||||
|
|
@ -221,6 +222,79 @@ static void test_update_field(void) {
|
|||
wo_rt_destroy(&rt);
|
||||
}
|
||||
|
||||
/* read-path index slice: wo_idx_probe answers a single-column equality
|
||||
* from the index buckets (expected O(1)) with the SAME id set the slab
|
||||
* walk yields — duplicates, nil text, and removed rows included; a
|
||||
* multi-column index refuses (0) so callers keep the scan fallback.
|
||||
* Class: Kv { k: Text, n: scalar } with a non-unique index on each,
|
||||
* plus one multi-column index over both. */
|
||||
static const uint8_t kv_kinds[] = {WO_K_TEXT, WO_K_SCALAR};
|
||||
static const uint32_t kv_idx_meta[] = {0, 1, 0, /* [k] */
|
||||
0, 1, 1, /* [n] */
|
||||
0, 2, 0, 1 /* [k, n] */};
|
||||
static const wo_classdesc KVCLASSES[] = {
|
||||
{.name = 0, .flags = 0, .field_cnt = 2, .kinds = kv_kinds, .idx_cnt = 3,
|
||||
.idx_meta = kv_idx_meta},
|
||||
};
|
||||
|
||||
static int ids_contain(const uint64_t *ids, uint32_t n, uint64_t id) {
|
||||
for (uint32_t i = 0; i < n; i++)
|
||||
if (ids[i] == id) return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void test_idx_probe(void) {
|
||||
wo_rt rt;
|
||||
T_EQ(wo_rt_init(&rt, 1 << 20, KVCLASSES, 1), 0);
|
||||
wo_db db;
|
||||
T_EQ(wo_db_init(&db, KVCLASSES, 1, 0, 1), 0);
|
||||
const char *msg = "";
|
||||
/* rows: ("a",1) ("a",2) (nil,1) ("b",2) ("a",3); then remove the
|
||||
* second "a" so the bucket's removal path is exercised */
|
||||
wo_str *sa = wo_str_new(&rt, "a", 1);
|
||||
wo_str *sb = wo_str_new(&rt, "b", 1);
|
||||
uint64_t r1[2] = {(uint64_t)(uintptr_t)sa, 1};
|
||||
uint64_t r2[2] = {(uint64_t)(uintptr_t)sa, 2};
|
||||
uint64_t r3[2] = {0, 1};
|
||||
uint64_t r4[2] = {(uint64_t)(uintptr_t)sb, 2};
|
||||
uint64_t r5[2] = {(uint64_t)(uintptr_t)sa, 3};
|
||||
uint64_t a1 = wo_row_insert(&db, 0, r1, &msg, NULL);
|
||||
uint64_t a2 = wo_row_insert(&db, 0, r2, &msg, NULL);
|
||||
uint64_t a3 = wo_row_insert(&db, 0, r3, &msg, NULL);
|
||||
uint64_t a4 = wo_row_insert(&db, 0, r4, &msg, NULL);
|
||||
uint64_t a5 = wo_row_insert(&db, 0, r5, &msg, NULL);
|
||||
T_CHECK(a1 && a2 && a3 && a4 && a5);
|
||||
T_EQ(wo_row_remove(&db, 0, a2), 0);
|
||||
|
||||
uint64_t *ids = NULL;
|
||||
uint32_t n = 0;
|
||||
/* text key "a" on index 0 ([k]): exactly a1 and a5 */
|
||||
T_EQ(wo_idx_probe(&db, 0, 0, 0, "a", 1, &ids, &n), 1);
|
||||
T_EQ(n, 2);
|
||||
T_CHECK(ids_contain(ids, n, a1) && ids_contain(ids, n, a5));
|
||||
free(ids);
|
||||
/* nil text key (bytes == NULL): exactly a3 */
|
||||
T_EQ(wo_idx_probe(&db, 0, 0, 0, NULL, 0, &ids, &n), 1);
|
||||
T_EQ(n, 1);
|
||||
T_CHECK(ids_contain(ids, n, a3));
|
||||
free(ids);
|
||||
/* scalar key 2 on index 1 ([n]): a4 only (a2 removed) */
|
||||
T_EQ(wo_idx_probe(&db, 0, 1, 2, NULL, 0, &ids, &n), 1);
|
||||
T_EQ(n, 1);
|
||||
T_CHECK(ids_contain(ids, n, a4));
|
||||
free(ids);
|
||||
/* absent key: probed, empty */
|
||||
T_EQ(wo_idx_probe(&db, 0, 1, 77, NULL, 0, &ids, &n), 1);
|
||||
T_EQ(n, 0);
|
||||
free(ids);
|
||||
/* multi-column index 2 ([k, n]): refuses — caller falls back */
|
||||
T_EQ(wo_idx_probe(&db, 0, 2, 2, NULL, 0, &ids, &n), 0);
|
||||
/* out-of-range index: refuses, never traps */
|
||||
T_EQ(wo_idx_probe(&db, 0, 9, 2, NULL, 0, &ids, &n), 0);
|
||||
wo_db_destroy(&db);
|
||||
wo_rt_destroy(&rt);
|
||||
}
|
||||
|
||||
static void test_misuse(void) {
|
||||
const char *msg = "";
|
||||
wo_db db;
|
||||
|
|
@ -238,6 +312,7 @@ int main(void) {
|
|||
test_id_interleave_across_shards();
|
||||
test_slab_growth_and_reuse();
|
||||
test_update_field();
|
||||
test_idx_probe();
|
||||
test_misuse();
|
||||
return t_report("test_table");
|
||||
}
|
||||
|
|
|
|||
|
|
@ -189,7 +189,13 @@ def gate(metrics):
|
|||
val, tol, floor = spec["value"], spec.get("tolerance_pct", 15), spec.get("floor")
|
||||
higher_is_better = spec.get("dir", "higher") == "higher"
|
||||
if QUICK:
|
||||
# quick mode: floors only — counts are too small for stable deltas
|
||||
# quick mode: floors only — counts are too small for stable
|
||||
# deltas. mix* skipped entirely: at N=2000 the completion
|
||||
# POLL (20ms sleeps) dominates wall time, so its ops/sec is
|
||||
# an artifact of the poll quantum, not the store.
|
||||
if ".mixread." in key or ".mixwrite." in key:
|
||||
ok(f"gate.{key} (skipped: quick-mode mix is poll-bound)")
|
||||
continue
|
||||
breach = floor is not None and ((got < floor) if higher_is_better else (got > floor))
|
||||
(ok if not breach else lambda n: bad(n, f"{got} vs floor {floor}"))(f"gate.{key} (floor)")
|
||||
continue
|
||||
|
|
@ -197,7 +203,9 @@ def gate(metrics):
|
|||
rel_bad = got < val * (100 - tol) / 100
|
||||
floor_bad = floor is not None and got < floor
|
||||
else:
|
||||
rel_bad = got > val * (100 + tol) / 100
|
||||
# sub-20µs latencies are histogram quantization: 2µs vs 1µs
|
||||
# reads as "+100%" while meaning one bucket — floor-only there
|
||||
rel_bad = val >= 20 and got > val * (100 + tol) / 100
|
||||
floor_bad = floor is not None and got > floor
|
||||
if rel_bad or floor_bad:
|
||||
bad(f"gate.{key}", f"{got} vs baseline {val} (tol {tol}%, floor {floor})")
|
||||
|
|
@ -206,14 +214,31 @@ def gate(metrics):
|
|||
if WRITE_BASELINE:
|
||||
write_baseline(metrics)
|
||||
|
||||
def tolerance_for(key):
|
||||
"""The tuning POLICY lives here so --write-baseline refreshes keep it
|
||||
(the first refresh silently reset hand-edits to 15% — never again).
|
||||
mix*: scheduling-dependent small counts. read/query + all .sN.*:
|
||||
machine jitter, and at post-index-µs scale a 1µs histogram step on a
|
||||
7µs p50 is already 14%."""
|
||||
if ".mixread." in key or ".mixwrite." in key: return 50
|
||||
if ".sN." in key: return 50
|
||||
if ".read." in key or ".query." in key: return 50
|
||||
return 15
|
||||
|
||||
def write_baseline(metrics):
|
||||
base = {"_config": {"N": N, "msg_n": MSG_N, "wal_n": WAL_N, "crash_reps": CRASH_REPS,
|
||||
"note": "refresh only with a commit that says why"}}
|
||||
"note": "refresh only with a commit that says why; "
|
||||
"tolerances come from tolerance_for() in the driver"}}
|
||||
for k, v in sorted(metrics.items()):
|
||||
if k.endswith(("rss_growth_kb", "fd_growth")): continue
|
||||
higher = k.endswith(("ops_sec", "msgs_sec"))
|
||||
base[k] = {"value": v, "tolerance_pct": 15,
|
||||
"floor": (v // 4 if higher else v * 4), "dir": "higher" if higher else "lower"}
|
||||
floor_div = 8 if k.endswith("msgs_sec") else 4
|
||||
# latency floors never sit below 100µs: at post-index µs scale a
|
||||
# 4×1µs "catastrophe line" is noise; the tripwire means "µs became
|
||||
# ms" (an O(table) relapse lands at 600µs+ and is still caught)
|
||||
base[k] = {"value": v, "tolerance_pct": tolerance_for(k),
|
||||
"floor": (v // floor_div if higher else max(v * 4, 100)),
|
||||
"dir": "higher" if higher else "lower"}
|
||||
os.makedirs(os.path.dirname(BASELINE), exist_ok=True)
|
||||
json.dump(base, open(BASELINE, "w"), indent=1, sort_keys=True)
|
||||
ok(f"baseline written ({len(base) - 1} metrics)")
|
||||
|
|
|
|||
4
tests/corpus/run/query-index-probe/fixture.out
Normal file
4
tests/corpus/run/query-index-probe/fixture.out
Normal file
|
|
@ -0,0 +1,4 @@
|
|||
indexed 10 unindexed 10
|
||||
guarded 10 and 0
|
||||
mirrored-take 4
|
||||
text 1 0
|
||||
58
tests/corpus/run/query-index-probe/fixture.wo
Normal file
58
tests/corpus/run/query-index-probe/fixture.wo
Normal file
|
|
@ -0,0 +1,58 @@
|
|||
-- index selection: `where var.col == key` on a single-column-indexed
|
||||
-- column lowers to DB_PROBE; the same query on an unindexed column
|
||||
-- keeps the scan. Results must be identical either way — the where
|
||||
-- guard stays the final arbiter (probe supplies candidates only).
|
||||
@table(name: "pts", index: [k])
|
||||
class Pt {
|
||||
k: Int
|
||||
u: Int
|
||||
tag: Text
|
||||
}
|
||||
|
||||
@table(name: "named", index: [name])
|
||||
class Named {
|
||||
name: Text
|
||||
}
|
||||
|
||||
fn main() -> Int {
|
||||
let i = 0;
|
||||
while i < 30 {
|
||||
insert Pt { k: i % 3, u: i % 3, tag: "t${i % 3}" };
|
||||
i = i + 1;
|
||||
}
|
||||
insert Named { name: "alpha" };
|
||||
insert Named { name: "beta" };
|
||||
-- probe path (k indexed) vs scan path (u unindexed): same counts
|
||||
let key = 2;
|
||||
let a = 0;
|
||||
for x in from x in Pt where x.k == key select x {
|
||||
a = a + 1;
|
||||
}
|
||||
let b = 0;
|
||||
for x in from x in Pt where x.u == key select x {
|
||||
b = b + 1;
|
||||
}
|
||||
print("indexed ${a} unindexed ${b}");
|
||||
-- probe + second guard: guard still filters candidates
|
||||
let c = 0;
|
||||
for x in from x in Pt where x.k == key where x.u == 2 select x {
|
||||
c = c + 1;
|
||||
}
|
||||
let d = 0;
|
||||
for x in from x in Pt where x.k == key where x.u == 0 select x {
|
||||
d = d + 1;
|
||||
}
|
||||
print("guarded ${c} and ${d}");
|
||||
-- mirrored equality + literal key + take
|
||||
let e = 0;
|
||||
for x in from x in Pt where key == x.k take 4 select x {
|
||||
e = e + 1;
|
||||
}
|
||||
print("mirrored-take ${e}");
|
||||
-- text key probe (unique index): hit and miss
|
||||
let want = "beta";
|
||||
let hit = from n in Named where n.name == want take 1 select n;
|
||||
let miss = from n in Named where n.name == "gamma" take 1 select n;
|
||||
print("text ${len(hit)} ${len(miss)}");
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in a new issue