OPFS sync write benchmark: all runs

Latest cross-browser report

Cross-browser comparisons

• 2026-09-17_00-07-25
  chrome, firefox · summary.md
• 2026-09-15_20-59-10
  chrome, firefox · summary.md
• 2026-09-15_19-49-35
  chrome, firefox · summary.md

Experiments

Single-browser runs, local browser builds (patched or not), fsync-free controls and traced runs. Their timings are not comparable with the runs above unless the note says so.

• 2026-09-15_22-14-16-local-wal-full-strace local build single browser traced with strace, timings inflated
  firefox · summary.md
  Local mozilla-central build 8d76a2ba4c (Firefox 158.0a1, plain opt build) with patches/0002-opfs-metadata-wal-synchronous-full.patch (PRAGMA journal_mode = WAL plus synchronous = FULL)
• 2026-09-15_22-13-00-local-wal-full local build single browser
  firefox · summary.md
  Local mozilla-central build 8d76a2ba4c (Firefox 158.0a1, plain opt build) with patches/0002-opfs-metadata-wal-synchronous-full.patch (PRAGMA journal_mode = WAL plus synchronous = FULL)
• 2026-09-15_22-12-15-local-wal-strace local build single browser traced with strace, timings inflated
  firefox · summary.md
  Local mozilla-central build 8d76a2ba4c (Firefox 158.0a1, plain opt build) with patches/0001-opfs-metadata-wal.patch (PRAGMA journal_mode = WAL)
• 2026-09-15_22-11-26-local-wal local build single browser
  firefox · summary.md
  Local mozilla-central build 8d76a2ba4c (Firefox 158.0a1, plain opt build) with patches/0001-opfs-metadata-wal.patch (PRAGMA journal_mode = WAL)
• 2026-09-15_22-10-09-local-baseline-strace local build single browser traced with strace, timings inflated
  firefox · summary.md
  Local mozilla-central build 8d76a2ba4c (Firefox 158.0a1, plain opt build), unpatched baseline
• 2026-09-15_22-08-20-local-baseline local build single browser
  firefox · summary.md
  Local mozilla-central build 8d76a2ba4c (Firefox 158.0a1, plain opt build), unpatched baseline
• 2026-09-15_20-20-08-strace traced with strace, timings inflated
  chrome, firefox · summary.md
• 2026-09-15_20-17-46-tmpfs
  chrome, firefox · summary.md
  Control run with the browser profiles on tmpfs: fsync is free there, so durability-bound rows show the CPU and IPC floor