Add workflow to clear persistent cache dirs on self-hosted runners #20755
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benjyw
approved these changes
Apr 4, 2024
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Yeah, but I could imagine it being made a bit smarter (e.g. only clear if there's not much space left, to avoid an unnecessary cache flush) and then run on a cron job. I'm not personally planning on doing that in the near future though. |
huonw
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Apr 5, 2024
… resilient (#20756) In #20755, I had a typo: formatting the jobs as a list, with `name`s keys... but that's the syntax for steps. Jobs need to be a dict with the ID as the key. This also squashes any errors from `rm -rf ....`: on Mac, it seems that attempts to delete directories that the runner doesn't have permission for (particularly system ones in `~/Library/Caches`). But that's fine, we'll still delete all of the caches created by "day-to-day" actions runs, which are the big ones. (Why wasn't this caught in #20755? I attempted to run the workflow before merging, and got errors, but incorrectly assumed this was because the workflow didn't exist on `main`, but they were actually because it's invalid.) This has now successfully run and cleared hundreds of gigs over two runs: - https://github.com/pantsbuild/pants/actions/runs/8562624080 (required the "squash `rm` errors fix) - https://github.com/pantsbuild/pants/actions/runs/8562947394/job/23467155450 (with that fix).
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We have a few long-lived runners that have cache directories that grow and grow until the machine runs out of space. This workflow is a stop-gap measure that makes it easier for anyone to give the machine more space, by making workflow to do it, rather than requiring someone with credentials to SSH in and do it manually.
For instance, on March 18, the macOS 11 runner had:
~/Library/Caches/nce~/.cache~/.rustup~/.pex~/.nceThis PR set-ups automatic deletion of these directories with some logging.