4 ms·

The author is probably clueless, not dishonest, in this particular mistake, but the Nix/NixOS installation command used is the slow one. Nix doesn't have versio

The author is probably clueless, not dishonest, in this particular mistake, but the Nix/NixOS installation command used is the slow one. Nix doesn't have versions for packages in the traditional sense. A fairer pair of test commands: nix-env -iA nixpkgs.ack nix-env -iA nixpkgs.qemu This is because Nix considers an entire tree of Nix expressions at once, rather than examining each package in isolation. When nix-env is run without the -A flag, it must evaluate the entirety of nixpkgs and then search for the desired package amongst the complete tree. With -A instead, it is possible to evaluate only the portions of the tree which are relevant to the named package.

tln 7y ago
Yeah, this is much speedier! On my machine, for the original command I get: created 56 symlinks in user environment real 0m 25.64s For your command I get: created 56 symlinks in user environment real 0m 4.39s
Sean1708 7y ago
To be fair `nix-channel --update` does take a ridiculously long time: $ time nix-channel --update unpacking channels... created 2 symlinks in user environment nix-channel --update 1.92s user 16.58s system 15% cpu 1:56.62 total $ time nix-env -iA nixpkgs.ack installing 'perl5.28.2-ack-3.0.2' these paths will be fetched (0.06 MiB download, 0.19 MiB unpacked): /nix/store/43rvd2kinid0g48ng07d782dsqb497g1-perl5.28.2-ack-3.0.2 /nix/store/k3f819h2ncadkd6g8yzyzg24wn3vr609-perl5.28.2-ack-3.0.2-man /nix/store/p82srjihmh7vnq4szl9q83adcl9r6j2v-perl5.28.2-File-Next-1.16 copying path '/nix/store/k3f819h2ncadkd6g8yzyzg24wn3vr609-perl5.28.2-ack-3.0.2-man' from 'https://cache.nixos.org'... copying path '/nix/store/p82srjihmh7vnq4szl9q83adcl9r6j2v-perl5.28.2-File-Next-1.16' from 'https://cache.nixos.org'... copying path '/nix/store/43rvd2kinid0g48ng07d782dsqb497g1-perl5.28.2-ack-3.0.2' from 'https://cache.nixos.org'... building '/nix/store/p765c3dxn32zccl4q9xjgr74n2ljgiky-user-environment.drv'... created 134 symlinks in user environment nix-env -iA nixpkgs.ack 0.19s user 0.24s system 36% cpu 1.158 total

tln 7y ago

Yeah, this is much speedier! On my machine, for the original command I get: created 56 symlinks in user environment real 0m 25.64s For your command I get: created 56 symlinks in user environment real 0m 4.39s

Sean1708 7y ago

To be fair `nix-channel --update` does take a ridiculously long time: $ time nix-channel --update unpacking channels... created 2 symlinks in user environment nix-channel --update 1.92s user 16.58s system 15% cpu 1:56.62 total $ time nix-env -iA nixpkgs.ack installing 'perl5.28.2-ack-3.0.2' these paths will be fetched (0.06 MiB download, 0.19 MiB unpacked): /nix/store/43rvd2kinid0g48ng07d782dsqb497g1-perl5.28.2-ack-3.0.2 /nix/store/k3f819h2ncadkd6g8yzyzg24wn3vr609-perl5.28.2-ack-3.0.2-man /nix/store/p82srjihmh7vnq4szl9q83adcl9r6j2v-perl5.28.2-File-Next-1.16 copying path '/nix/store/k3f819h2ncadkd6g8yzyzg24wn3vr609-perl5.28.2-ack-3.0.2-man' from 'https://cache.nixos.org'... copying path '/nix/store/p82srjihmh7vnq4szl9q83adcl9r6j2v-perl5.28.2-File-Next-1.16' from 'https://cache.nixos.org'... copying path '/nix/store/43rvd2kinid0g48ng07d782dsqb497g1-perl5.28.2-ack-3.0.2' from 'https://cache.nixos.org'... building '/nix/store/p765c3dxn32zccl4q9xjgr74n2ljgiky-user-environment.drv'... created 134 symlinks in user environment nix-env -iA nixpkgs.ack 0.19s user 0.24s system 36% cpu 1.158 total