Files

giles 65d4c70638 js-on-sx: parallel test262 runner with raw-fd line buffer

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>

2026-04-24 06:18:48 +00:00

969 B

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test262 scoreboard

Pinned commit: d5e73fc8d2c663554fb72e2380a8c2bc1a318a33 Wall time: 426.2s

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)
30x TypeError: not a function
17x Timeout
1x Unhandled: Not callable: {:random <js-math-random()> :trunc <js-math-tr

Categories (worst pass-rate first, min 10 runnable)

Category	Pass	Fail	Skip	Timeout	Total	Pass %
built-ins/Math	67	204	39	17	327	23.3%

Per-category top failures (min 10 runnable, worst first)

built-ins/Math (67/288 — 23.3%)

94x ReferenceError (undefined symbol)
79x Test262Error (assertion failed)
30x TypeError: not a function
17x Timeout
1x Unhandled: Not callable: {:random <js-math-random()> :trunc <js-math-tr

969 B Raw Blame History