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Use ccache in Github Actions (#3218)
This works very well for CUDA and HIP builds. However, the benefit is
relatively small for GCC, Clang and Mac builds because most of their
time are spent on clang-tidy and running tests.
There are two remaining issues. Ccache works with Intel classic compiler
icpc, but it does not work with the Intel SYCL compiler, icpx. On
Windows, MSVC works, but I cannot get ClangCl to work. We can revisit
these two issues in the future.
In earlier versions of this PR, we compiled ccache from source because
the package version on Ubuntu 20.04 is too old. Because of that, we had
to move `env: {CXXFLAGS: ...}` down to AMReX's `Build & Install` section
to avoid the flags being picked up when compiling ccache. In the current
version, we download the binary version of ccache 4.8. However, we did
not move the env setup back. It seems to make sense to keep it in the
`Build & Install` section.
To use github cache, we need to provide a primary key and optionally
restore keys. If the primary key is found, it will be used, but the
change to the cache during the CI will NOT be saved at the end of the
job. That's how github cache works. If it is not found, partially
matched restore keys will be considered and the latest one will be used.
At the end, the cache (whether it's updated or not) will be saved under
the name of the primary key. Below is an example of our setup.
```
with:
path: ~/.cache
key: ccache-${{ github.workflow }}-${{ github.job }}-git-${{ github.sha }}
restore-keys: |
ccache-clang.yml-${{ env.cache-name }}-git-
```
Here, we use the workflow string and job string as part of the names for
the keys. We also include the git commit hash `${{github.sha}}` in the
name of the primary key. In this setup, the CI will always fail to find
the primary key. This is what we want because it guarantees the latest
ccache data will be saved. Furthermore, the most recently saved cache
from the last CI job will be used to restore the cache during
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| #!/usr/bin/env bash | ||
|
|
||
| if [[ $# -eq 2 ]]; then | ||
| CVER=$1 | ||
| else | ||
| CVER=4.8 | ||
| fi | ||
|
|
||
| wget https://github.com/ccache/ccache/releases/download/v${CVER}/ccache-${CVER}-linux-x86_64.tar.xz | ||
| tar xvf ccache-${CVER}-linux-x86_64.tar.xz | ||
| sudo cp -f ccache-${CVER}-linux-x86_64/ccache /usr/local/bin/ |
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