Haskell in Nixpkgs/NixOS - Public Room Timeline

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	For discussions and questions about Haskell with Nix, cabal2nix and haskellPackages in nixpkgs \| Current Docs: https://haskell4nix.readthedocs.io/ \| More Nix: #community:nixos.org \| More Haskell: #haskell-space:matrix.org	148 Servers

Sender	Message	Time
3 Jul 2025
Teo (he/him)	I was profiling eval time of nixpkgs recently and I noticed that a lot of time was spent doing `hasPrefix` when evalling the haskell package set. I think this is caused by the hasPrefix call to check if stuff is part of amazonka and each call of `hasPrefix` re-checks if the needle is a path lol https://github.com/NixOS/nixpkgs/issues/419216 We could optimise the hasPrefix call, but maybe we should just add the list of amazonka packages to this file rather than traversing the entire haskell package set? https://github.com/NixOS/nixpkgs/blob/a44903b927ab16b829a76f51f84bca02a7f89a0f/pkgs/development/haskell-modules/configuration-common.nix#L3352	19:19:35
alexfmpe	I was profiling eval time of nixpkgs how does one even do this? I always wondered	20:24:38
Teo (he/him)	In reply to @alexfmpe:matrix.org I was profiling eval time of nixpkgs how does one even do this? I always wondered This is what I used https://github.com/NixOS/nix/pull/13220	20:30:51
alexfmpe	Ooooh	20:37:45