The cache seems to be restored: https://github.com/bitcoin/bitcoin/actions/runs/18740171534/job/53454677246?pr=33677#step:7:212
However, the following "Generate Build System" step takes more than 30 minutes: https://github.com/bitcoin/bitcoin/actions/runs/18740171534/job/53454677246?pr=33677#step:8:1
This does not seem expected?
Was there any image update in between?
Not sure how to check that. Also, looks like the cache was deleted, so this will likely fix itself on the next run on the default branch. Though, it could make sense to still investigate this.
As expected, this fixed itself after the cache was cycled. However, the cache-id is the same, while the file sizes are different:
https://github.com/bitcoin/bitcoin/actions/runs/18751000329/job/53490344269?pr=33686#step:7:210
Not sure what to make of this one, it's using GH runners (as Cirrus don't offer Windows runners yet) and, as you spotted, the only clue we have is that the size differs while the id remains the same...
This could mean that we arre not hashing all relevant files to generate the id? But in any case I would assume that restoring a partially-matching cache should still result in some speedups (if not all)? At least this is what we aim for with depends/ccache restores on linux/macos.
Is this what is expected on Windows with this binary cache too? I am afraid I am so unfamiliar with Windows that I don't know.
Is this what is expected on Windows with this binary cache too? I am afraid I am so unfamiliar with Windows that I don't know.
Yeah, I am not familiar with GHA, nor Windows, so I can't really help here either.
Just for reference, it seems to be back at being broken: Cache restore, but slow Generate:
https://github.com/bitcoin/bitcoin/actions/runs/18778024349/job/53577115580?pr=33677#step:7:211
However, the following "Generate Build System" step takes more than 30 minutes:
Looks like it can take up to 51 minutes: https://github.com/bitcoin/bitcoin/actions/runs/18837851942/job/53742910238#step:8:200.
I checked the last 200 runs to see if this was still happening, and it does seem to, but a lot less frequently than when this was opened.
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</details>
I think what is going on is:
save cache step:
If it's a while between the cache eviction and the next merge, we will see all intermediate PR jobs take a long time to run, as there is no cache for them to hit on until the next merge.
Not sure there is any fix for this, other than using a 3rd party cache (like S3), increasing our GH cache allowance (heard rumours this may come, but probably only for Enterprise I'd guess) or move these jobs to hosted runners which have better caching. The only provider I had in mind here would be Warp, but they say their cache doesn't work on Windows machines.
No good options from me still.
Cache is evicted for some reason, presumably due to low space
Good find. I guess this could be due to several branches writing windows caches. For example, right now I see win64-native-vcpkg-binary-04fcf06a88f8571c75c5068ea9f67b8012e86d99ba204a334c696f0ec5e79551 2.6 GB cached 5 hours ago [29.x](https://github.com/bitcoin/bitcoin/tree/29.x) Last used 5 hours ago. I don't think there is any value in saving caches for non-main branches, as there won't be any pull requests that could use them within the one-week cache duration limit (except for some rare backport pulls).
So the fix would be to to only write the cache on the default branch?
So the fix would be to to only write the cache on the default branch?
Agreed.