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Julian Sommer
12408268be
The cache was a union that only grew: each run restored everything, added what it compiled and saved the result, so objects superseded by later commits stayed for Go's full five-day window. Deleting every entry and letting it rebuild took Build and Test from 3434 MB to 478 MB, restore from 75s to 13s and save from 64s to 7s. Dropping entries nothing has touched in four hours holds it near that. Go bumps an entry's mtime when a run uses it, so the working set survives; the step runs after the tests, so a pruned entry costs a later run a partial recompile at worst and never the current one.