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Add cross-os caching to the zstd workaround section.

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Lovepreet Singh 2022-08-26 09:00:35 +00:00
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@ -248,10 +248,10 @@ A cache today is immutable and cannot be updated. But some use cases require the
#### Use cache across feature branches #### 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. 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 #### Improving cache restore performance on Windows/Using cross-os caching
Currently, cache restore is slow on Windows due to both tar being slow and the compression algorithm being used is `gzip`. Zstd was disabled on windows due to issues with bsd tar(libarchive) which is 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 by using GNU tar instead. 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.
Add the following step to your workflow before the cache step: 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 ```yaml
- if: ${{ runner.os == 'Windows' }} - if: ${{ runner.os == 'Windows' }}
@ -262,8 +262,9 @@ Add the following step to your workflow before the cache step:
echo C:\Program Files\Git\usr\bin>>"%GITHUB_PATH%" echo C:\Program Files\Git\usr\bin>>"%GITHUB_PATH%"
``` ```
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 `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.
## Contributing ## Contributing
We would love for you to contribute to `actions/cache`, pull requests are welcome! Please see the [CONTRIBUTING.md](CONTRIBUTING.md) for more information. We would love for you to contribute to `actions/cache`, pull requests are welcome! Please see the [CONTRIBUTING.md](CONTRIBUTING.md) for more information.