Eelco Dolstra <[email protected]> skribis:
> On 15/12/13 19:14, James Cook wrote:
>
>> Thanks for pointing out the option, though; somehow I had assumed
>> NixOS enabled that by default... is there a reason not to?
>
> Yes, chroot builds are slow. https://github.com/NixOS/nix/issues/179
That reads:
--8<---------------cut here---------------start------------->8---
with import <nixpkgs> {};
with lib;
let deps = map (n: runCommand "depM-${toString n}" {} "touch $out") (range 1
100);
in runCommand "foo" { x = deps; } "touch $out"
(i.e. a trivial build with 100 trivial dependencies) takes 4.7s to build on my
laptop without chroot, but 39.6s
with chroot.
--8<---------------cut here---------------end--------------->8---
How representative of real life is it?
Not much I presume. When you do have 100 derivations to build, their
body will typically take longer than ‘touch $out’. At this point, the
overhead shouldn’t matter this much.
But it would matter when using Nix as a Make replacement.
Ludo’.
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