Improves CI performance - #22995
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WIP
tl/dr: ~45m -> ~21m; this is CI-only stuff -- everything in #22917 reduces further.
Results
f47a44e
Faster Windows CI through parallel builds/tests and overlapping database setup
Cache hit rate: ~95%.
8e526f1
Benchmark checkout avoids downloading unnecessary historical file contents
d2b0d08
Keeps non-Windows compiler caches fresh
Before: the older the weekly cache, the lower the hit rate. 2026-07-27 was ~99% (0:30s) while 2026-08-02 was only ~25% (6:52). Rolling cache solves that. 1
Cache hit rate: ~99%.
9de2a2e
Skip unused setup in the ordinary Linux ASAN job
Saves 1:37 per ASAN run. Depending on download speeds shaves off 1–3 min.
7507629
Run Function JIT tests concurrently
This will currently not reduce total CI time, because they are not the longest running job. However, runnign them in parallel gives earlier feedback. This will help when all the other non-CI PRs landed.
Footnotes
each new master commit rolls the cache forward. ↩
when cache not fresh. ↩