CI: prune stale caches to prevent LRU eviction #13917
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Replace github.run_id with github.sha in cache keys (run_id creates new immutable entries every run, sha enables reuse) Add 3-level restore-keys: base_ref, master, bare prefix (PR builds can restore from master's cache on first push)
Cache referenced non-existent steps.get-date.outputs.today causing 100% miss rate. Use hashFiles of conda recipe files with restore-keys for proper cache behavior.
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I would have thought that letting GitHub remove the least-recently used cache entries is what we want. Can you help clarify why it isn't? |
Each CI run creates ~16 immutable cache entries (one per matrix job). Without cleanup, old entries accumulate until the 10GB repo limit triggers LRU eviction of ccache entries. Add reusable cleanup-cache action that each job calls after saving its cache - deletes older entries with the same prefix on the same branch. Add cache_cleanup.yml to purge all caches on branch deletion.
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What does this PR do?
Add automatic cache cleanup to prevent the 10GB repo limit from evicting ccache entries.
Each CI run creates ~16 immutable cache entries (one per matrix job). Without cleanup, old entries accumulate until GitHub's LRU eviction wipes valuable ccache entries.
Cache count bounded at ~16-20 per active branch.
Note: Requires
actions: writepermission forgh cache delete. Added only to workflows that use the cleanup step.Tasklist