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nix: better defaults settings for maxJobs/buildCores

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most users just want to use all available cores.
This commit aligns our defaults with what we do in NixOS
This commit is contained in:
Jörg Thalheim 2020-05-30 02:14:06 +01:00
parent cec42039b0
commit eb7b41a2a0
4 changed files with 9 additions and 23 deletions
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5
modules/examples/lnl.nix
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@ -469,9 +469,4 @@
users.nix.configureBuildUsers = true;
users.nix.nrBuildUsers = 32;
# You should generally set this to the total number of logical cores in your system.
# $ sysctl -n hw.ncpu
nix.maxJobs = 1;
nix.buildCores = 1;
}

5
modules/examples/ofborg.nix
View file

@ -26,9 +26,4 @@ with lib;
# Used for backwards compatibility, please read the changelog before changing.
# $ darwin-rebuild changelog
system.stateVersion = 4;
# You should generally set this to the total number of logical cores in your system.
# $ sysctl -n hw.ncpu
nix.maxJobs = 1;
nix.buildCores = 1;
}

5
modules/examples/simple.nix
View file

@ -23,9 +23,4 @@
# Used for backwards compatibility, please read the changelog before changing.
# $ darwin-rebuild changelog
system.stateVersion = 4;
# You should generally set this to the total number of logical cores in your system.
# $ sysctl -n hw.ncpu
nix.maxJobs = 1;
nix.buildCores = 1;
}

17
modules/nix/default.nix
View file

@ -82,24 +82,25 @@ in
};
nix.maxJobs = mkOption {
type = types.int;
default = 1;
type = types.either types.int (types.enum ["auto"]);
default = "auto";
example = 64;
description = ''
This option defines the maximum number of jobs that Nix will try
to build in parallel. The default is 1. You should generally
set it to the total number of logical cores in your system (e.g., 16
for two CPUs with 4 cores each and hyper-threading).
This option defines the maximum number of jobs that Nix will try to
build in parallel. The default is auto, which means it will use all
available logical cores. It is recommend to set it to the total
number of logical cores in your system (e.g., 16 for two CPUs with 4
cores each and hyper-threading).
'';
};
nix.buildCores = mkOption {
type = types.int;
default = 1;
default = 0;
example = 64;
description = ''
This option defines the maximum number of concurrent tasks during
one build. It affects, e.g., -j option for make. The default is 1.
one build. It affects, e.g., -j option for make.
The special value 0 means that the builder should use all
available CPU cores in the system. Some builds may become
non-deterministic with this option; use with care! Packages will