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js-on-sx: parallel test262 runner with raw-fd line buffer

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Rework test262-runner.py to support --workers N parallel shards, each running
a long-lived sx_server session. Replace thread-per-readline with a select-based
raw-fd line buffer.

On 2-core machines, 1 worker still beats 2 (OCaml eval is CPU-bound and starves
when shared). Auto-defaults n_workers=1 on <=2 CPU, nproc-1 (up to 8) otherwise.

Throughput baseline: ~1.1 Math tests/s serial on 2-core (unchanged; the
evaluator dominates). The runner framework is now ready to scale on bigger
machines without further code changes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-04-24 06:18:48 +00:00
parent 20a1a81d15
commit 65d4c70638
3 changed files with 261 additions and 168 deletions
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lib/js/test262-scoreboard.md
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@@ -1,31 +1,30 @@
# test262 scoreboard
Pinned commit: `d5e73fc8d2c663554fb72e2380a8c2bc1a318a33`
Wall time: 275.0s
Wall time: 426.2s
**Total:** 66/288 runnable passed (22.9%). Raw: pass=66 fail=206 skip=39 timeout=16 total=327.
**Total:** 67/288 runnable passed (23.3%). Raw: pass=67 fail=204 skip=39 timeout=17 total=327.
## Top failure modes
- **94x** ReferenceError (undefined symbol)
- **79x** Test262Error (assertion failed)
- **31x** TypeError: not a function
- **16x** Timeout
- **30x** TypeError: not a function
- **17x** Timeout
- **1x** Unhandled: Not callable: {:random <js-math-random()> :trunc <js-math-tr
- **1x** SyntaxError (parse/unsupported syntax)
## Categories (worst pass-rate first, min 10 runnable)
| Category | Pass | Fail | Skip | Timeout | Total | Pass % |
|---|---:|---:|---:|---:|---:|---:|
| built-ins/Math | 66 | 206 | 39 | 16 | 327 | 22.9% |
| built-ins/Math | 67 | 204 | 39 | 17 | 327 | 23.3% |
## Per-category top failures (min 10 runnable, worst first)
### built-ins/Math (66/288 — 22.9%)
### built-ins/Math (67/288 — 23.3%)
- **94x** ReferenceError (undefined symbol)
- **79x** Test262Error (assertion failed)
- **31x** TypeError: not a function
- **16x** Timeout
- **30x** TypeError: not a function
- **17x** Timeout
- **1x** Unhandled: Not callable: {:random <js-math-random()> :trunc <js-math-tr