26480863994
85%
master: 84%

Ran 26 May 2026 11:57PM UTC

Jobs 1

Files 661

Run time 2min

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Committed 26 May 2026 11:22PM UTC coverage: 84.004% (+0.02%) from 83.984%

Build # 26480863994

Build Type

push

github

Committed by

web-flow

Commit Message

ci(cmake): gate ccache save to main + set max-size to stop PR-run eviction (#1009) (#1010)

The cmake CI build time regressed from ~1 min to ~9-16 min per job. Root cause
is ccache eviction, not code: the [fast] Build step went 55s -> 566s while the
Test step stayed flat (~20s), and the ccache hit rate dropped to ~1% (6/510) on
a cold run vs ~99% when warm.

Both ccache blocks used `key: ${{ matrix.artifact }}` with no save-gating and no
max-size, so every PR/branch run saved a fresh (~500MB) cache. Under GitHub's
10GB per-repo cache limit (LRU eviction), a burst of CI activity creates many
caches and evicts the warm main ones; subsequent runs restore a near-empty cache
and pay full cold-compile cost.

Fix:
- save: only on pushes to main -- PR/branch runs restore the warm main cache
  (high hit rate for unchanged files) but no longer create new caches, which
  eliminates the eviction storm.
- max-size: "1G" so a full build's objects fit without ccache-internal eviction
  (affordable now that few caches are created).

Coverage/ASan/UBSan jobs don't use ccache and are inherently slow (Debug -O0 +
instrumentation) -- out of scope (see #1007).

Resolves #1009

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Coverage Stats

46816 of 55731 relevant lines covered (84.0%)

5774913.15 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	26480863994.1	26 May 2026 11:57PM UTC	661	84.0	GitHub Action Run

stillwater-sc / universal / 26480863994
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master: 84%

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