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Idea: Coalesce cache scans for batched source removal

Aperta
  • Qualcosa non va?
#620 0 commenti 0 reazioni 0 assegnatari Vedi su GitHub

I maintainer di solito rispondono entro 1 giorno

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Valutazione

Difficoltà
5/5
Tempo stimato
Più di una settimana
Idoneità per principianti
25/100
Tipo di issue
Funzionalità
Chiarezza
Abbastanza chiara
Stato di attività
Attiva
Stack tecnologico
rust
Ambito
compilers

Direzione di ricerca

No source files, tests, or entry points are named. Begin by collecting a real branch-switch or folder-removal trace, then measure time to fresh diagnostics as requested; the work is justified only if it shows a noticeable stall and preserves mixed-event ordering.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

ideas

Deferred idea

Removing a source file currently scans module ownership and the derived-query caches to discard affected entries. When one batch removes many warmed sources, those scans run again for every file. Consecutive removal-only events could be coalesced and retired together, so each cache is scanned only once. Any other event would first flush the pending removals, which keeps mixed-event ordering intact.

This is an idea to evaluate later, not a request to land the existing prototype.

Evidence so far

The benchmarks used real sources from the combined core+acme dependency closure: 631 packages and 7,371 sources, with modules checked before removal. The deletion scenarios themselves were constructed. They show the algorithmic cost but don't show a common workflow. For example, removing 100 sources cut the LSP watched-file handler median from 287 ms to 38 ms. Removing a single source doesn't benefit.

Why defer

  • Deletions in a repository are usually sparse. Restarting the language server is a reasonable workaround for an occasional large batch.
  • Branch switching might benefit, but it hasn't been measured. It also produces a mix of events rather than long runs of removals.

Revisit this after a real branch-switch or folder-removal trace shows a noticeable stall. At that point, measure the time to fresh diagnostics rather than claiming full-editor or cold-build gains.

Detailed measurements and prototype patches are in the investigation thread (Amp access required).

Lingua principale
Rust
Stelle
118
Fork
12
Merge medio
7h 23m
PR unite (30g)
100

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