df25275843
Tooling that produced the perf findings (committed for rerunnability): - scripts/bench/wasm-opt-bench.sh + o2-config-sweep.sh + sweep.conf: replay asyncify/-O2 over a cached fixture under allocator/THP/core matrices on the Hetzner runner. - scripts/bench/setup-vm.sh + cloud-init/ + vm-build.sh: local QEMU (HVF) Ubuntu guest with Docker CE to verify Linux builds without burning paid runners. - .gitignore: bench fixtures/results and the VM image stay local. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
33 lines
1.9 KiB
Text
33 lines
1.9 KiB
Text
# Parameters for the wasm-opt config sweep (.github/workflows/wasm-opt-bench.yml).
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# Edit, commit, push to a bench/** branch to launch a run.
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#
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# Config grammar: <preset>[@<cores>] (see scripts/bench/o2-config-sweep.sh)
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# presets: baseline(v121 -O2) v130-O2 v130-O1 v121-O1 v130-light v121-light
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# mimalloc-retain thp-off (last two are proven-dead controls)
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# @<cores> overrides BINARYEN_CORES for that cell (thread sweep).
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# CAP_SECONDS_CONF: >0 = windowed storm sample (~CAP/60 min/cell, whole matrix in
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# one run); 0 = run each to completion (true wall-clock). FIXTURE_RUN_ID_CONF:
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# reuse a prior run's cached fixture (blank = build it ~40 min).
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#
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# VERDICT from run #1 (27197360957): the -O2 cost is ~90% FUTEX LOCK CONTENTION
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# in Binaryen (type mutex), NOT allocator/THP (madvise=0, compaction=0, identical
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# under glibc & mimalloc; mimalloc-retain saved only 8%). So allocator/THP are
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# dead; the levers are NEWER Binaryen (devs fixed this after v121) and FEWER
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# threads, plus lighter passes. Run #2 triages those windowed (fast):
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# win_sysfrac = lock contention (LOWER better)
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# win_usercores = real-work rate (HIGHER better → shorter wall for same passes)
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# ---- Run #2: windowed triage (10 min/cell) on the cached run-#1 fixture ----
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# baseline = v121 -O2 @32c (control: expect sys_frac~0.88, user_cores~2.6)
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# v130-O2 = newer Binaryen @32c (does the version fix the lock?)
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# baseline@8 = v121 -O2 @8c (do fewer threads cut contention?)
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# v130-O2@8 = newer + fewer threads
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# v121-O1 = lighter passes @32c (does less work progress faster?)
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CONFIGS_CONF="baseline v130-O2 baseline@8 v130-O2@8 v121-O1"
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CORES_CONF=""
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FIXTURE_RUN_ID_CONF="27197360957"
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DIAGNOSTIC_CONF="0"
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CAP_SECONDS_CONF="600"
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# ---- Run #3 (planned): full run (CAP_SECONDS_CONF="0") of the winner(s) for true
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# wall-clock + output validity, then Chrome e2e. e.g. CONFIGS="v130-O2 v130-O2@8"
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