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94 lines
2.9 KiB
Nix
94 lines
2.9 KiB
Nix
{ lib
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, config
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, pkgs
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, inputs
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, ...
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}:
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let
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gcc-system-features = arch: lib.optionals (arch != null) ([ "gccarch-${arch}" ]
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++ map (x: "gccarch-${x}") lib.systems.architectures.inferiors.${arch});
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in
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{
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options = {
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simd.arch = lib.mkOption {
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type = with lib.types; nullOr str;
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default = null;
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description = ''
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Microarchitecture string for nixpkgs.hostPlatform.gcc.march and to generate system-features.
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Can be determined with: gcc -march=native -Q --help=target | grep march
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'';
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};
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};
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imports = [ ./builder.nix ];
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config = {
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warnings = lib.optionals (config.simd.arch == null) [ "Please set simd.arch for ${config.networking.hostName}" ];
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# Allow more open files for non-root users to run NixOS VM tests.
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security.pam.loginLimits = [
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{ domain = "*"; item = "nofile"; type = "-"; value = "20480"; }
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];
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# Makes the computer go faster.
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nixos.jobserver.enable = true;
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# Memory accounting techniques
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systemd.services.nix-daemon.serviceConfig = {
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MemoryAccounting = true;
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MemoryMax = "225G";
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MemoryHigh = "220G";
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MemorySwapMax = "2G";
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ManagedOOMSwap = "kill";
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ManagedOOMMemoryPressure = "kill";
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MemoryPressureWatch = "on";
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};
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nix = {
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# Garbage-collect often
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gc.automatic = true;
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gc.dates = "*:45";
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gc.options = ''--max-freed "$((128 * 1024**3 - 1024 * $(df -P -k /nix/store | tail -n 1 | ${pkgs.gawk}/bin/awk '{ print $4 }')))"'';
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# Randomize GC to avoid thundering herd effects.
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gc.randomizedDelaySec = "1800";
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# Inchallah, it works.
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package = pkgs.nixVersions.nix_2_18;
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# package = lib.mkForce inputs.nixpkgs-unstable.legacyPackages.x86_64-linux.nixVersions.nix_2_17;
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# should be enough?
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nrBuildUsers = 128;
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settings = {
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keep-outputs = false;
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keep-derivations = false;
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use-cgroups = true;
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http-connections = 0;
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auto-allocate-uids = true;
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cores = 0;
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max-jobs = 2; # Do not build more than 2 derivations at once in the event, both of them are too big, yes this is stupid, fix it in Nix.
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fsync-metadata = true;
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substituters = [
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"https://nix-community.cachix.org"
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"https://tum-dse.cachix.org"
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];
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system-features = [ "benchmark" "big-parallel" "kvm" "nixos-test" ] ++ gcc-system-features config.simd.arch;
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trusted-public-keys = [
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"nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
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"tum-dse.cachix.org-1:v67rK18oLwgO0Z4b69l30SrV1yRtqxKpiHodG4YxhNM="
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];
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experimental-features = [
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"auto-allocate-uids"
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# "ca-derivations" this feature is really extremely broken.
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"cgroups"
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"fetch-closure"
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"impure-derivations"
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];
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};
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};
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nixpkgs.config.allowUnfree = true;
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};
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}
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