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| 27 Nov 2024 |
 Leonardo Santiago | I have about 150~ machines under nixosConfigurations in a single flake, and nix flake check takes around 30 minutes to run. Any tips on how to make it faster? | 13:50:59 |
 @adam:robins.wtf | maybe nix-fast-build? | 14:09:30 |
 hexa | wondering how many nixpkgs you are instantiating 🤔 | 14:09:54 |
| @adam:robins.wtf | is check on a nixosConfig just an eval? | 14:10:38 |
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 magic_rb | It also builds iirc | 22:51:04 |
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| Leonardo Santiago |
wondering how many nixpkgs you are instantiating 🤔
should be just one, they're all using the same one.
| 13:21:34 |
| Leonardo Santiago | *
wondering how many nixpkgs you are instantiating 🤔
should be just one, they're all using the same one.
| 13:21:44 |
| Leonardo Santiago |
It also builds iirc
yes, but even with --no-build it's still painfully slow. it's the same default check, and most of the structure should be shared for all of them, it seems to me that nix must be re-evaluating a ton for it to take that much time
| 13:22:48 |
 ElvishJerricco | In reply to @o-santi:matrix.org
wondering how many nixpkgs you are instantiating 🤔
should be just one, they're all using the same one.
Just because they're using the same nixpkgs flake input doesn't mean they're using the same nixpkgs instance. Each nixos config by default re-imports nixpkgs (re-evaluates it) so that it can apply its custom nixpkgs.* nixos options to the import | 13:36:58 |
| Leonardo Santiago | hmm, but they should all be using the exact same nixpkgs.lib.nixosSystem call. is there any way to avoid re-evaluating nixpkgs? | 13:37:49 |
| ElvishJerricco | right but each of those calls does (effectively) import ./. { /* ... */ } in the nixpkgs flake | 13:38:34 |
| ElvishJerricco | You can avoid re-evaluating by setting pkgs in the nixosSystem call, I believe. Or by setting the nixpkgs.pkgs nixos option. Either of this will break anything in the nixpkgs.* nixos options (though I think that module yells at you about that now so it'll be obvious) | 13:39:59 |
