libstore+nix-build: add load-limit setting and use its value for NIX_LOAD_LIMIT en var #8105
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…LOAD_LIMIT env var Aimed at solving issue NixOS#7091 Signed-off-by: Antoine Viallon <[email protected]>
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Closes: NixOS#7091 Closes: NixOS#6855 Closes: NixOS#8105 Co-authored-by: Alex Wied <[email protected]>
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Closes: NixOS#7091 Closes: NixOS#6855 Closes: NixOS#8105 Co-authored-by: Alex Wied <[email protected]>
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Closes: NixOS#7091 Closes: NixOS#6855 Closes: NixOS#8105 Co-authored-by: Alex Wied <[email protected]>
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Fixes #7091
Motivation & Context
As explained in issue #7091, NixOS/nixpkgs#192447 removed
-lflag from all buildsystem invocations in nixpkgs, in order to improve Hydra efficiency.However, this had several drawbacks, as this removed the ability to limit CPU load, causing OOM issues or extreme system loads in some bad scenarios (
ninjabuildsystem building something with-flto=autoenabled).This patch aims to reintroduce the possibility to limit system load (together with PR NixOS/nixpkgs#192799), while still allowing Hydra to have full build efficiency.
Checklist for maintainers
Maintainers: tick if completed or explain if not relevant
tests/**.shsrc/*/teststests/nixos/*Priorities
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