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Perf regression: nuget/rescan wall +31% (f3c6313a..17793173; #1340/#1341)

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Bewertung

Schwierigkeit
4/5
Geschätzter Aufwand
3-5 Tage
Anfängerfreundlichkeit
45/100
Issue-Typ
Bug
Klarheit
Größtenteils klar
Aktivitätsstatus
Aktiv
Tech-Stack
rust
Bereich
cli, performance

Rechercherichtung

Start by reproducing the nuget/hosted and nuget/rescan regression with the provided interleaved compare command, then inspect scan::hosted::run_redirect_selected_untracked, hosted::engine::confirm, and patch::redirect::presence::groups_present. The profile points to automaton construction and repeated parsing of obj/project.assets.json; use the listed commits as candidates to investigate. Done means identifying the cause and showing the benchmark no longer has the regression.

Vom Indexierungsmodell aus dem Issue-Text verfasst.

Beschreibung

agent:triaged bench perf-regression pm:nuget priority:p3

[agent] Bench: nuget/rescan wall time is +31% and nuget/hosted +28% on today's main (17793173), compared with f3c6313a (the previous bench run, 2026-10-09). Request counts are unchanged (53).

Culprit: not bisected. The candidates are the two commits in f3c6313a..17793173 that add NuGet inputs to the hosted engine's discovery and confirm step: e7d8bae4 (#1340, NuGet lock discovery for member and named locks) and ee14e7d7 (#1341, NuGet mapping exclusivity and inherited sources). 10874cc3 (#1344, the stale global-packages warning) is a third, less likely candidate.

Same-machine interleaved compare

Base f3c6313a → head 17793173, on a 4 vCPU Intel Xeon @ 2.10GHz cloud sandbox. An A/A run on the same machine was clean.

scenario round base wall head wall Δ wall [95% CI] Δ CPU requests
nuget/hosted 1 (15+10 pairs) 81.9 ms 100.9 ms +28.4% [+12.5, +34.0] +20.0% 53
nuget/hosted 2 (20+10 pairs) 77.9 ms 95.7 ms +28.2% [+20.6, +38.1] +21.7% 53
nuget/rescan 1 65.1 ms 88.9 ms +34.5% [+24.6, +48.5] +24.7% 53
nuget/rescan 2 61.9 ms 80.8 ms +30.7% [+24.2, +37.2] +23.9% 53

(These numbers use the bench fixture from #1422, which allows #1344's new redirect_nuget_stale_global_package warning. Without that change the head fails validation on main.)

Hot spot

Callgrind on the head binary, nuget/rescan (900 packages, 25 patched, restored project with obj/project.assets.json), inclusive instructions:

41.7%  scan::hosted::run_redirect_selected_untracked
34.8%    hosted::engine::confirm
34.6%      patch::redirect::presence::groups_present
23.5%        aho_corasick::AhoCorasick::new          (automaton build, 1 call)
11.0%        Automaton::try_find_overlapping (27 texts)
14.6%  crawlers::nuget_crawler::parse_project_assets  (4 calls: 2× restore_scope, 2× read_project_assets)
14.8%  vex::discover::nuget::extract

About a third of the scan goes to groups_present, which builds a DFA and scans 27 texts. The new NuGet discovery entries (NUGET_LOCKS_KEY / inherited-sources texts, plus the extra lock files read in) now feed into it. obj/project.assets.json is also parsed into a serde_json::Value four times per scan.

Repro
export CARGO_PROFILE_PERF_INHERITS=release CARGO_PROFILE_PERF_LTO=thin CARGO_PROFILE_PERF_STRIP=none
git worktree add /tmp/base f3c6313a && (cd /tmp/base && CARGO_TARGET_DIR=/tmp/tb cargo build --locked --profile perf -p socket-patch-cli)
CARGO_TARGET_DIR=/tmp/th cargo build --locked --profile perf -p socket-patch-cli -p socket-patch-bench
/tmp/th/perf/socket-patch-bench compare --base /tmp/tb/perf/socket-patch --head /tmp/th/perf/socket-patch -f '^nuget/' --runs 20

Runner: nproc 4, Intel(R) Xeon(R) Processor @ 2.10GHz.

Generated by Claude Code

Vorherrschende Sprache
Rust
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8
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19 Std. 1 Min.
Gemergte PRs (30 T.)
473

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