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CCache: Difference between revisions
use sandbox-paths
imported>Milahu |
imported>Milahu (use sandbox-paths) |
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with ccache, recompile time can be reduced from many hours to a few minutes | with ccache, recompile time can be reduced from many hours to a few minutes | ||
== | == add ccache to sandbox == | ||
add to <code>/etc/nixos/configuration.nix</code> | add to <code>/etc/nixos/configuration.nix</code> | ||
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<pre> | <pre> | ||
nix.extraOptions = '' | nix.extraOptions = '' | ||
sandbox = | extra-sandbox-paths = /nix/var/cache/ccache | ||
''; | ''; | ||
</pre> | </pre> | ||
todo: use <code>nix.sandboxPaths</code>? [https://github.com/NixOS/nixpkgs/issues/153343] | |||
run <code>sudo nixos-rebuild switch</code> | run <code>sudo nixos-rebuild switch</code> | ||
now <code>/etc/nix/nix.conf</code> should have <code>sandbox = | now <code>/etc/nix/nix.conf</code> should have <code>sandbox-paths = /nix/var/cache/ccache</code> | ||
create the cache folder | |||
<pre> | |||
sudo mkdir -m0770 -p /nix/var/cache/ccache | |||
# Linux | |||
sudo chown --reference=/nix/store /nix/var/cache/ccache | |||
# macOS workaround for chown --reference | |||
nix-shell -p coreutils --run 'sudo chown --reference=/nix/store /nix/var/cache/ccache' | |||
</pre> | |||
== derivation ccache == | |||
to enable ccache only for one derivation | |||
patch the <code>default.nix</code> file | patch the <code>default.nix</code> file | ||
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preConfigure = '' | preConfigure = '' | ||
export CCACHE_DIR=/var/cache/ccache | export CCACHE_DIR=/nix/var/cache/ccache | ||
export CCACHE_UMASK=007 | export CCACHE_UMASK=007 | ||
'' | '' | ||
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<pre> | <pre> | ||
# watch ccache size | # watch ccache size | ||
sudo watch du -sh /var/cache/ccache | sudo watch du -sh /nix/var/cache/ccache | ||
# watch ccache stats | # watch ccache stats | ||
sudo watch ccache --dir /var/cache/ccache --show-stats --verbose | sudo watch ccache --dir /nix/var/cache/ccache --show-stats --verbose | ||
</pre> | </pre> | ||
== see also == | |||
* https://leanprover.github.io/lean4/doc/make/nix.html | |||
* [https://nixos.org/manual/nix/stable/command-ref/conf-file.html sandbox-paths in nix.conf] | |||