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Cache bundle analysis per output file - #100475
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wbinnssmith
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wbinnssmith
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October 20, 2026 23:55
wbinnssmith
added this pull request to stack #100487
October 20, 2026 23:55
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Analyze each emitted and traced file once in a cached task that returns its filename, chunk membership, and chunk parts with normalized sources and compressed sizes. Routes previously made 3-5 task calls per shared file, and task-graph bookkeeping for those calls dominated analysis. Splitting, compression, and membership enumeration become plain helpers under that task, since each is read once.
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Summary
Analyze each emitted and traced file once in a cached task that returns its filename, chunk membership, and chunk parts with normalized sources and compressed sizes. Routes previously made 3â5 task calls per shared file, and task-graph bookkeeping for those calls dominated analysis. Splitting, compression, and membership enumeration run as plain helpers under that task, since each is read once.
Measured on v0/chat with
next build --analyze(#99962), analysis phase only: new tasks went from 269k to 242k, calls into existing tasks from 8.49M to 5.07M, and median CPU time from 150s to 124s. All 455 data artifacts were byte-identical across 12 runs.Supersedes #100486.
Verification
cargo test -p turbopack-analyze --test split_chunkandcargo test -p next-api --lib analyzepassed.release-with-debug, installed it in v0/chat, and comparednext build --analyzeoutput against the previous binary across alternating runs.