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nixos: default nix.maxJobs to auto

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Instead of making the configuration less portable by hard coding the number of
jobs equal to the cores we can also let nix set the same number at runtime.
This commit is contained in:
Jörg Thalheim 2020-04-07 08:21:02 +01:00
parent 5d3f4e9c0b
commit e6a15db534
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GPG key ID: 003F2096411B5F92
2 changed files with 6 additions and 9 deletions
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4
nixos/modules/installer/tools/nixos-generate-config.pl
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@ -91,9 +91,6 @@ sub hasCPUFeature {
} }
# Detect the number of CPU cores.
my $cpus = scalar (grep {/^processor\s*:/} (split '\n', $cpuinfo));
# Determine CPU governor to use # Determine CPU governor to use
if (-e "/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors") { if (-e "/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors") {
@ -562,7 +559,6 @@ my $hwConfig = <<EOF;
boot.kernelModules = [$kernelModules ]; boot.kernelModules = [$kernelModules ];
boot.extraModulePackages = [$modulePackages ]; boot.extraModulePackages = [$modulePackages ];
$fsAndSwap $fsAndSwap
nix.maxJobs = lib.mkDefault $cpus;
${\join "", (map { " $_\n" } (uniq @attrs))}} ${\join "", (map { " $_\n" } (uniq @attrs))}}
EOF EOF

11
nixos/modules/services/misc/nix-daemon.nix
View file

@ -92,13 +92,14 @@ in
maxJobs = mkOption { maxJobs = mkOption {
type = types.either types.int (types.enum ["auto"]); type = types.either types.int (types.enum ["auto"]);
default = 1; default = "auto";
example = 64; example = 64;
description = '' description = ''
This option defines the maximum number of jobs that Nix will try This option defines the maximum number of jobs that Nix will try to
to build in parallel. The default is 1. You should generally build in parallel. The default is auto, which means it will use all
set it to the total number of logical cores in your system (e.g., 16 available logical cores. It is recommend to set it to the total
for two CPUs with 4 cores each and hyper-threading). number of logical cores in your system (e.g., 16 for two CPUs with 4
cores each and hyper-threading).
''; '';
}; };