actions/cache
1
0
Fork 0
mirror of https://code.forgejo.org/actions/cache.git synced 2025-04-23 09:13:56 +08:00
Code Issues Projects Releases Packages Wiki Activity

Release compression related changes for windows

Browse source
This commit is contained in:
Sampark Sharma 2022-12-23 05:59:01 +00:00 • committed by GitHub
parent c17f4bf466
commit 95a9c77002
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
9 changed files with 962 additions and 422 deletions
Download patch file Download diff file Expand all files Collapse all files

18
tips-and-workarounds.md
View file

@ -19,24 +19,6 @@ A cache today is immutable and cannot be updated. But some use cases require the
## Use cache across feature branches
Reusing cache across feature branches is not allowed today to provide cache [isolation](https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#restrictions-for-accessing-a-cache). However if both feature branches are from the default branch, a good way to achieve this is to ensure that the default branch has a cache. This cache will then be consumable by both feature branches.
## Improving cache restore performance on Windows/Using cross-os caching
Currently, cache restore is slow on Windows due to tar being inherently slow and the compression algorithm `gzip` in use. `zstd` is the default algorithm in use on linux and macos. It was disabled on Windows due to issues with bsd tar(libarchive), the tar implementation in use on Windows.
To improve cache restore performance, we can re-enable `zstd` as the compression algorithm using the following workaround. Add the following step to your workflow before the cache step:
```yaml
- if: ${{ runner.os == 'Windows' }}
name: Use GNU tar
shell: cmd
run: |
echo "Adding GNU tar to PATH"
echo C:\Program Files\Git\usr\bin>>"%GITHUB_PATH%"
```
The `cache` action will use GNU tar instead of bsd tar on Windows. This should work on all Github Hosted runners as it is. For self-hosted runners, please ensure you have GNU tar and `zstd` installed.
The above workaround is also needed if you wish to use cross-os caching since difference of compression algorithms will result in different cache versions for the same cache key. So the above workaround will ensure `zstd` is used for caching on all platforms thus resulting in the same cache version for the same cache key.
## Force deletion of caches overriding default cache eviction policy
Caches have [branch scope restriction](https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#restrictions-for-accessing-a-cache) in place. This means that if caches for a specific branch are using a lot of storage quota, it may result into more frequently used caches from `default` branch getting thrashed. For example, if there are many pull requests happening on a repo and are creating caches, these cannot be used in default branch scope but will still occupy a lot of space till they get cleaned up by [eviction policy](https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#usage-limits-and-eviction-policy). But sometime we want to clean them up on a faster cadence so as to ensure default branch is not thrashing. In order to achieve this, [gh-actions-cache cli](https://github.com/actions/gh-actions-cache/) can be used to delete caches for specific branches.