shoney.arickathil
a873cf7331
- `randread N R` in the sample: fill N rows, read R across the WHOLE range - Weyl order `i*2654435761 mod n` — no RNG in the language, none needed; both legs read the SAME key order so residency is the only variable - `randread` driver leg: control (256 MiB, does not bind) vs over-cap (6 MiB + swap), sizes kept modest — quick resolves it in ~5s - gates the RATIO, not the absolutes: over-cap reads/sec belongs to the box's swap device, the factor between two runs belongs to the engine - reads must all resolve (hits == R) or the leg fails; a collapse measured over unresolved reads is noise - 133 checks, 0 failures; gate bites on a doctored collapse_x Measured — this closes the gap the swap leg left: - resident 1 851 166 reads/sec, p50 0us p99 1us - over-cap 6 771 reads/sec, p50 128us p99 487us - 273x throughput, ~480x p99, all 20 000 reads resolving in both - so the two access patterns sit ~270x apart under identical pressure: append-mostly insert ~1%, random read 273x - departure is a STEP not a curve (1us -> 487us, nothing between), which is why p99_departure_decile finds no knee — there is none - caveat recorded, NOT inherited: this is demand-paged anonymous memory through swap (4 KiB/fault, no readahead). `resident: keys` preads via the page cache — should be better, but databasev2 2 task 7 must measure its own read path. New criterion added there Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
687 lines
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12 KiB
JSON
687 lines
No EOL
12 KiB
JSON
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