ci: remove SCCACHE_GHA_ENABLED to stop cache entry explosion#373
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streamer45 merged 1 commit intomainfrom Apr 25, 2026
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ci: remove SCCACHE_GHA_ENABLED to stop cache entry explosion#373streamer45 merged 1 commit intomainfrom
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The sccache GHA backend stores one cache entry per compiled artifact, creating ~1000 tiny entries that evict the much more valuable Swatinem/rust-cache entries (full target/ snapshots) via LRU. Remove SCCACHE_GHA_ENABLED from all workflows. On hosted runners sccache falls back to local disk (harmless no-op on ephemeral VMs). On the self-hosted GPU runner it continues to work via persistent local disk cache. The other optimizations from #372 (shared-key, save-if, cache-on-failure, RUSTC_WRAPPER) remain in place. Signed-off-by: StreamKit Devin <devin@streamkit.dev> Co-Authored-By: Claudio Costa <cstcld91@gmail.com>
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Restore and save ~/.cache/sccache as a single GHA cache entry per Cargo.lock revision. This gives hosted runners compilation-level cache hits without the per-artifact entry explosion caused by SCCACHE_GHA_ENABLED (reverted in #373). Strategy: - actions/cache/restore before sccache-action starts (all hosted jobs) - actions/cache/save at end of job, main-branch only (if: always()) - Self-hosted GPU jobs skipped — they already have persistent disk cache - Plugins use a separate cache key prefix (sccache-plugins-*) Closes #374 Signed-off-by: StreamKit Devin <devin@streamkit.dev> Co-authored-by: StreamKit Devin <devin@streamkit.dev> Co-authored-by: Claudio Costa <cstcld91@gmail.com>
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Summary
Removes
SCCACHE_GHA_ENABLED: "true"from all 5 Rust workflows, added in #372.The sccache GHA backend stores one cache entry per compiled artifact. A single CI run created ~1000 tiny entries (total ~134 MiB) which evicted nearly all the
Swatinem/rust-cacheentries via LRU. Only 2 of the original rust-cache entries survived — the rest were pushed out by sccache's granular entries.The rust-cache entries are far more valuable: they snapshot the full
target/directory including linking artifacts, build scripts, and incremental compilation state. Losing them means every job starts from scratch.Without
SCCACHE_GHA_ENABLED, sccache falls back to local disk — a harmless no-op on ephemeral hosted runners, and still fully functional on the self-hosted GPU runner via its persistent local disk cache (which already achieves 100% hit rate).All other optimizations from #372 remain in place:
RUSTC_WRAPPER: sccacheinrelease.ymlandmarketplace-build.ymlshared-keygrouping (skit / skit-e2e / skit-gpu)save-if: ${{ github.ref == 'refs/heads/main' }}on hosted runner jobscache-on-failure: trueeverywhereReview & Testing Checklist for Human
v0-rust-skit-*,v0-rust-skit-e2e-*,v0-rust-skit-gpu-*) reappear after the first main-branch CI rungh cache delete --allor selectively viagh cache list | grep sccacheNotes
mozilla-actions/sccache-actionis still installed in all workflows — it provides the sccache binary whichRUSTC_WRAPPERreferences. It just won't use the GHA cache API withoutSCCACHE_GHA_ENABLED.Link to Devin session: https://staging.itsdev.in/sessions/cdf841e834eb419aa04168a565311f10
Requested by: @streamer45