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No parallelism in nix run shells #2418

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ElvishJerricco opened this issue Sep 13, 2018 · 2 comments
Closed

No parallelism in nix run shells #2418

ElvishJerricco opened this issue Sep 13, 2018 · 2 comments

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@ElvishJerricco
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Spawning multiple tasks in a nix run shell puts all of them on the same CPU, because nix run pins itself to a single CPU (presumably for unrelated Nix build reasons), thus pinning all children to that CPU.

$ stress -c 4

4 CPUs will be at 100%

$ nix run nixpkgs.hello -c stress -c 4

1 CPU will be at 100%
@edolstra
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I think this was fixed in cc7b438.

@ElvishJerricco
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Ah! My bad. That's almost certainly it. Thanks.

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@edolstra @ElvishJerricco