CCache - Revision history

Xz: Not related to NixOS, read https://ccache.dev/manual/4.8.2.html#_cache_statistics and run ccache -vs

2024-06-18T16:02:42Z

Not related to NixOS, read https://ccache.dev/manual/4.8.2.html#_cache_statistics and run ccache -vs

← Older revision		Revision as of 16:02, 18 June 2024
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	Be warned that this configuration option might affect reproducibility of builds, and could lead to cache poisoning.		Be warned that this configuration option might affect reproducibility of builds, and could lead to cache poisoning.
	See [https://github.com/NixOS/nixpkgs/issues/109033 issue 109033] for more details.		See [https://github.com/NixOS/nixpkgs/issues/109033 issue 109033] for more details.

	~~== Uncacheable ==~~

	~~TODO: why are some compilations "uncacheable" according to <code>ccache --show-stats</code>?~~

	== See also ==		== See also ==

Xz: Sloppiness

2024-06-15T16:36:25Z

Sloppiness

@@ Line 155: / Line 155: @@
 sudo watch ccache --dir /nix/var/cache/ccache --show-stats
 </pre>
 == Uncacheable ==

imported>Pupbrained: Typo fixes

2023-02-10T02:19:59Z

Typo fixes

← Older revision		Revision as of 02:19, 10 February 2023
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	== Non-NixOS ==		== Non-NixOS ==

	~~Ceate~~ the cache folder:		Create the cache folder:

	<pre>		<pre>
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	== Uncacheable ==		== Uncacheable ==

	TODO: why are some compilations "uncacheable" according to <code>ccache --show-stats</code>		TODO: why are some compilations "uncacheable" according to <code>ccache --show-stats</code>?

	== See also ==		== See also ==

imported>Terinjokes at 14:29, 18 January 2023

2023-01-18T14:29:49Z

← Older revision		Revision as of 14:29, 18 January 2023
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	</syntaxhighlight>		</syntaxhighlight>

	Note, that if the package is a top-level package, you ~~can also~~ add it to the <code>programs.ccache.packageNames</code> list.		Some packages do not use <code>stdenv</code> directly. You may need to plumb it through other dependencies first.

			Note, that if the package is a top-level package, you may instead add it to the <code>programs.ccache.packageNames</code> list.

	<syntaxhighlight lang="nix">		<syntaxhighlight lang="nix">
	programs.ccache.packageNames = [ "ffmpeg" ];		programs.ccache.packageNames = [ "ffmpeg" ];
	</syntaxhighlight>		</syntaxhighlight>

	~~Some packages do not use <code>stdenv</code> directly. You may need to plumb it through other dependencies first.~~

	=== System CCache ===		=== System CCache ===

imported>Terinjokes: rewrote to use NixOS module and to cleanup non-nixos instructions

2023-01-18T14:26:53Z

rewrote to use NixOS module and to cleanup non-nixos instructions

Show changes

imported>Atry at 19:49, 5 October 2022

2022-10-05T19:49:30Z

← Older revision		Revision as of 19:49, 5 October 2022
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	export CCACHE_DIR=/nix/var/cache/ccache		export CCACHE_DIR=/nix/var/cache/ccache
	export CCACHE_UMASK=007		export CCACHE_UMASK=007
	''		'';

	# ...		# ...

imported>Fufexan: Capitalize, add category

2022-08-09T20:18:38Z

Capitalize, add category

← Older revision		Revision as of 20:18, 9 August 2022
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	~~ccache~~ is useful for [[Packaging]] large packages with [[Incremental builds]]		CCache is useful for [[Packaging]] large packages with [[Incremental builds]].

	~~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 CCache to sandbox ==

	~~add~~ to <code>/etc/nixos/configuration.nix</code>		Add to <code>/etc/nixos/configuration.nix</code>

	<~~pre~~>		<syntaxhighlight lang="nix">
	nix.extraOptions = ''		nix.extraOptions = ''
	extra-sandbox-paths = /nix/var/cache/ccache		extra-sandbox-paths = /nix/var/cache/ccache
	'';		'';
	</~~pre~~>		</syntaxhighlight>

	~~todo~~: use <code>nix.sandboxPaths</code>? [https://github.com/NixOS/nixpkgs/issues/153343]		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-paths = /nix/var/cache/ccache</code>		Now <code>/etc/nix/nix.conf</code> should have <code>sandbox-paths = /nix/var/cache/ccache</code>

	~~create~~ the cache folder		Ceate the cache folder

	<pre>		<pre>
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	</pre>		</pre>

	== ~~derivation ccache~~ ==		== Derivation CCache ==

	~~to enable ccache only for one derivation~~

	patch the <code>default.nix</code> file		To enable CCache only for one derivation, patch the <code>default.nix</code> file

	<~~pre~~>		<syntaxhighlight lang="nix">
	{ stdenv		{ stdenv
	, ccacheStdenv		, ccacheStdenv
Line 52:		Line 50:

	# ...		# ...
	</~~pre~~>		</syntaxhighlight>

	~~add~~ <code>ccacheStdenv</code> to dependencies		Add <code>ccacheStdenv</code> to dependencies.

	~~run~~ <code>nix-build</code>		Run <code>nix-build</code>.

	== ~~system ccache~~ ==		== System CCache ==

	todo		todo

	== ~~monitor ccache~~ status ==		== Monitor CCache status ==

	<pre>		<pre>
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	</pre>		</pre>

	== ~~uncacheable~~ ==		== Uncacheable ==

	~~todo~~: why are some compilations "uncacheable" according to <code>ccache --show-stats</code>		TODO: why are some compilations "uncacheable" according to <code>ccache --show-stats</code>

	== ~~see~~ also ==		== See also ==

	* https://leanprover.github.io/lean4/doc/make/nix.html		* 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]		* [https://nixos.org/manual/nix/stable/command-ref/conf-file.html sandbox-paths in nix.conf]

			[[Category: Development]]

imported>Milahu at 17:04, 19 January 2022

2022-01-19T17:04:58Z

← Older revision		Revision as of 17:04, 19 January 2022
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	sudo watch ccache --dir /nix/var/cache/ccache --show-stats --verbose		sudo watch ccache --dir /nix/var/cache/ccache --show-stats --verbose
	</pre>		</pre>

			== uncacheable ==

			todo: why are some compilations "uncacheable" according to <code>ccache --show-stats</code>

	== see also ==		== see also ==

imported>Milahu: use sandbox-paths

2022-01-06T19:26:30Z

use sandbox-paths

← Older revision		Revision as of 19:26, 6 January 2022
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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

	== ~~derivation~~ ccache ==		== add ccache to sandbox ==

	~~to enable ccache only for one derivation~~

	add to <code>/etc/nixos/configuration.nix</code>		add to <code>/etc/nixos/configuration.nix</code>
Line 11:		Line 9:
	<pre>		<pre>
	nix.extraOptions = ''		nix.extraOptions = ''
	sandbox = ~~false~~		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 = ~~false~~</code>		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]

imported>Milahu: Milahu moved page Ccache to CCache

2022-01-06T18:56:19Z

Milahu moved page Ccache to CCache

← Older revision		Revision as of 18:56, 6 January 2022
(No difference)