actions
/
cache
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add zstd workaround to README. Add yaml formatting to code blocks. Move Cache segment restore to Known Practices section.

This commit is contained in:
Lovepreet Singh 2022-08-25 13:14:23 +00:00
parent 7e7820edca
commit eb8b610ee6
1 changed files with 18 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
README.md
View File

@ -234,7 +234,7 @@ A cache gets downloaded in multiple segments of fixed sizes (`1GB` for a `32-bit
#### Update a cache #### Update a cache
A cache today is immutable and cannot be updated. But some use cases require the cache to be saved even though there was a "hit" during restore. To do so, use a `key` which is unique for every run and use `restore-keys` to restore the nearest cache. For example: A cache today is immutable and cannot be updated. But some use cases require the cache to be saved even though there was a "hit" during restore. To do so, use a `key` which is unique for every run and use `restore-keys` to restore the nearest cache. For example:
``` ```yaml
- name: update cache on every commit - name: update cache on every commit
uses: actions/cache@v3 uses: actions/cache@v3
with: with:
@ -248,6 +248,23 @@ 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
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.
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%"
```
This should work on all Github Hosted runners as it is. For self-hosted runners, please ensure you have GNU tar and `zstd` installed.
## 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.