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nix-daemon: improve open files for NixOS VM tests and thundering effects for GC

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Raito Bezarius 2023-07-01 13:00:27 +02:00
parent 7fd10c28cb
commit 5e9b7b7732
1 changed files with 10 additions and 2 deletions
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12
modules/nix-daemon.nix
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@ -24,11 +24,19 @@ in
config = {
warnings = lib.optionals (config.simd.arch == null) [ "Please set simd.arch for ${config.networking.hostName}" ];
# Allow more open files for non-root users to run NixOS VM tests.
security.pam.loginLimits = [
{ domain = "*"; item = "nofile"; type = "-"; value = "20480"; }
];
nix = {
# Garbage-collect often
gc.automatic = true;
gc.dates = "03:15";
gc.options = "--delete-older-than 30d";
gc.dates = "*:45";
gc.options = ''--max-freed "$((128 * 1024**3 - 1024 * $(df -P -k /nix/store | tail -n 1 | ${pkgs.gawk}/bin/awk '{ print $4 }')))"'';
# Randomize GC to avoid thundering herd effects.
gc.randomizedDelaySec = "1800";
# 2.11, 2.12 suffers from a bug with remote builders…
package = pkgs.nixVersions.nix_2_13;