I have another cache related question :thread:
# generalc
curved-television-6568
05/16/2023, 6:26 PMI have another cache related question đ§”
curved-television-6568
05/16/2023, 6:30 PMI have observed this message in a post step from a GH action workflow:
Cache hit occurred on the primary key pants-named-caches-Linux-v0-d154b8007fde31179adbd61ffe987a6179fd9906aef8530cef6380a2d4675a42-9466e26d26c07b231d49f6425a26b4e6e88d5b39ca936e191991d98ee6c4e127, not saving cache.Now, this seems to me that the cache entry will hold what ever was put into that first run when this cache blob was first created. But, what if that was for a run that using
--changed-sincecurved-television-6568
05/16/2023, 6:47 PMmy idea now leans towards that we need to touch the lockfiles in order to run âallâ the tests, and that should be close to âgoodâ in that sense. So hereâs a gotcha that if you make changes or touch the âgha-cache-keyâ in order to âbust the cachesâ you may get a really small cache blob that is practically useless. (I went from 3G to 12MâŠwhich wasnât what I was looking for) đ
b
broad-processor-92400
05/16/2023, 7:17 PMYour observation is correct, for GHAs default caching action.
I think the only way to reliably get good caches when caching coarsely with it is to avoid âchanged-since⊠or to capture the changes in the cache key itself.
It looks like thereâs now the possibility to explicitly save a cache, which might allow overwriting, but the docs arenât exactly encouraging: https://github.com/actions/cache#using-a-combination-of-restore-and-save-actions
c
curved-television-6568
05/16/2023, 7:27 PMthanks for confirming. also having changed since in the cache key feels like it would be a bit chicken-and-egg problem (or resolve to using bare
gitcurved-television-6568
05/16/2023, 7:31 PMand thanks for the nudge about cache/save, good to know about
b
broad-processor-92400
05/16/2023, 8:44 PMAnother option would be only using changed-since if the cache action reports a hit, and doing a âfullâ build if not.
That said, depending on the ârealâ caching, processes may not actually run to fill out the named caches, even without the changed-since filtering?
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