Personal Nix setup
Activate sysctl iogpu changes on startup
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modules/base/macos-vram.nix
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modules/base/macos-vram.nix
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with lib;
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let
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cfg = config.modules.vram;
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setWiredLimitMb = optionalString (cfg.wiredLimit != null) ''
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wired_memsize_mb=$(($(sysctl -n hw.memsize) / 1024 / 1024))
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sysctl -w iogpu.wired_limit_mb="$((wired_memsize_mb - ${toString (cfg.wiredLimit * 1024)}))"
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'';
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setWiredLowWaterMarkMb = optionalString (cfg.wiredLowWatermark != null) ''
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sysctl -w iogpu.wired_lwm_mb="$((${toString (cfg.wiredLowWatermark * 1024)}))"
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'';
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in helpers.darwinAttrs {
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options.modules.vram = {
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wiredLimit = mkOption {
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};
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config = mkIf (cfg.wiredLimit != null || cfg.wiredLowWatermark != null) {
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system.activationScripts.postActivation.text = let
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setWiredLimitMb = optionalString (cfg.wiredLimit != null) ''
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wired_memsize_mb=$(($(sysctl -n hw.memsize) / 1024 / 1024))
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sysctl -w iogpu.wired_limit_mb="$((wired_memsize_mb - ${toString (cfg.wiredLimit * 1024)}))"
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'';
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setWiredLowWaterMarkMb = optionalString (cfg.wiredLowWatermark != null) ''
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sysctl -w iogpu.wired_lwm_mb="$((${toString (cfg.wiredLowWatermark * 1024)}))"
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'';
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in ''
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system.activationScripts.postActivation.text = ''
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${setWiredLimitMb}
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${setWiredLowWaterMarkMb}
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'';
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launchd.daemons."sysctl-wired-limit" = {
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serviceConfig.RunAtLoad = true;
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script = ''
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${setWiredLimitMb}
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${setWiredLowWaterMarkMb}
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'';
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};
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};
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}
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