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Perf regression: bun-isolated/rescan wall +21% (cc938aa6..17793173; #1279 candidate)

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Bewertung

Schwierigkeit
5/5
Geschätzter Aufwand
Über eine Woche
Anfängerfreundlichkeit
8/100
Issue-Typ
Bug
Klarheit
Muss geklärt werden
Aktivitätsstatus
Aktiv
Tech-Stack
bun, rust
Bereich
cli, performance

Rechercherichtung

This is a performance investigation, not a patch request. The bisect points at commit dcdc1043 (#1279, removal of vendoring code) and 4c800ac5 (#1370), with the rest of the regression in eca5d247..17793173. Start by rebuilding the perf profile and running socket-patch-bench compare on bun-isolated/rescan as given in the repro. Done means the wall-time regression is traced to a specific change and fixed, confirmed by a CI that excludes zero.

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Beschreibung

agent:triaged bench enhancement perf-regression pm:bun priority:p1

[agent] Bench: confirmed weekly regression in bun-isolated/rescan (and a smaller one in bun-isolated/hosted / bun/hosted).

Base cc938aa6 (main, 2026-10-09) → head 657fce2b (main, 2026-10-15). Same machine, interleaved pairs. Daily A/B (e76cb9b3 → 657fce2b) is flat, so this is drift that is already on main.

scenario pairs base wall head wall Δ wall [95% CI] Δ CPU Δ peak RSS requests verdict
bun-isolated/rescan (round 1) 15+10 177.3 ms 212.2 ms +22.9% [+12.7, +30.4] +16.0% +3.9% 127 regression
bun-isolated/rescan (confirm) 25+15 205.0 ms 244.7 ms +21.3% [+12.7, +32.7] +12.1% +5.8% 127 regression
bun-isolated/hosted (confirm) 25+15 243.6 ms 281.1 ms +15.6% [+8.4, +22.9] +14.0% +8.0% 127 regression
bun/hosted (confirm) 25+15 212.9 ms 234.5 ms +12.9% [+9.7, +16.5] +7.0% +4.3% 127 regression

Request counts are unchanged. The 2026-10-12 daily run already saw bun-isolated/rescan +15% (f3c6313a..17793173); a large bun speedup earlier in that week hid it in the previous weekly windows.

Bisect (3 builds over the 151 commits cc938aa6..17793173, bun-isolated/rescan, 15 pairs each vs cc938aa6):

build Δ wall
1438b1a7 (#1356) +5.8% [-0.5, +16.2] ≈
a43cf327 (#1332) +12.4% [+6.5, +23.2]
eca5d247 (#1330) +11.5% [+2.1, +20.6]
657fce2b (today) +21.3%

So about half lands in 1438b1a7..a43cf327 (19 commits). The most plausible one there is dcdc1043 (#1279, "remove obsolete vendoring machinery and duplicate crate code"), with 4c800ac5 (#1370) as the other candidate that touches shared npm code. The rest lands after eca5d247, in eca5d247..17793173. Not narrowed further: the bisect budget is spent.

Repro

export CARGO_PROFILE_PERF_INHERITS=release CARGO_PROFILE_PERF_LTO=thin CARGO_PROFILE_PERF_STRIP=none
git worktree add /tmp/base cc938aa6 && (cd /tmp/base && CARGO_TARGET_DIR=/tmp/tb cargo build --locked --profile perf -p socket-patch-cli)
cargo build --locked --profile perf -p socket-patch-cli -p socket-patch-bench
target/perf/socket-patch-bench compare --base /tmp/tb/perf/socket-patch --head target/perf/socket-patch -f '^bun-isolated/' -f '^bun/hosted$' --runs 25

Runner: 4 vCPU, Intel(R) Xeon(R) Processor @ 2.80GHz (cloud sandbox). A/A on the same runner was clean (npm/hosted -3.9%, pip/hosted -3.1%, cargo/hosted +5.1%, all ≈).

Progress log: https://github.com/SocketDev/socket-patch/discussions/575


Generated by Claude Code

Vorherrschende Sprache
Rust
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8
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16 Std. 19 Min.
Gemergte PRs (30 T.)
586

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