Simon Gardling
d48f27701f
xmrig's RandomX pollutes the L3 cache, making other processes appear ~3-8% busier. With a single 5% threshold for both stopping and resuming, the script oscillates: start xmrig -> cache pressure inflates CPU -> stop xmrig -> CPU drops -> restart -> repeat. Split into CPU_STOP_THRESHOLD (15%) and CPU_RESUME_THRESHOLD (5%). The stop threshold sits above xmrig's indirect pressure, so only genuine workloads trigger a pause. The resume threshold confirms the system is truly idle before restarting.
36 lines
950 B
Nix
36 lines
950 B
Nix
{
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config,
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lib,
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pkgs,
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...
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}:
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lib.mkIf config.services.xmrig.enable {
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systemd.services.xmrig-auto-pause = {
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description = "Auto-pause xmrig when other services need CPU";
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after = [ "xmrig.service" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${pkgs.python3}/bin/python3 ${./xmrig-auto-pause.py}";
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Restart = "always";
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RestartSec = "10s";
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NoNewPrivileges = true;
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ProtectHome = true;
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ProtectSystem = "strict";
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PrivateTmp = true;
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RestrictAddressFamilies = [
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"AF_UNIX" # systemctl talks to systemd over D-Bus unix socket
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];
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MemoryDenyWriteExecute = true;
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StateDirectory = "xmrig-auto-pause";
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};
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environment = {
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POLL_INTERVAL = "3";
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GRACE_PERIOD = "15";
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CPU_STOP_THRESHOLD = "15";
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CPU_RESUME_THRESHOLD = "5";
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STARTUP_COOLDOWN = "10";
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STATE_DIR = "/var/lib/xmrig-auto-pause";
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};
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};
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}
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