Alex Wied
1af5d798a4
By default, Nix sets the "cores" setting to the number of CPUs which are physically present on the machine. If cgroups are used to limit the CPU and memory consumption of a large Nix build, the OOM killer may be invoked. For example, consider a GitLab CI pipeline which builds a large software package. The GitLab runner spawns a container whose CPU is limited to 4 cores and whose memory is limited to 16 GiB. If the underlying machine has 64 cores, Nix will invoke the build with -j64. In many cases, that level of parallelism will invoke the OOM killer and the build will completely fail. This change sets the default value of "cores" to be ceil(cpu_quota / cpu_period), with a fallback to std::thread::hardware_concurrency() if cgroups v2 is not detected.
Nix
Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.
Installation
On Linux and macOS the easiest way to install Nix is to run the following shell command (as a user other than root):
$ curl -L https://nixos.org/nix/install | sh
Information on additional installation methods is available on the Nix download page.
Building And Developing
See our Hacking guide in our manual for instruction on how to build nix from source with nix-build or how to get a development environment.
Additional Resources
- Nix manual
- Nix jobsets on hydra.nixos.org
- NixOS Discourse
- Matrix - #nix:nixos.org
- IRC - #nixos on libera.chat
License
Nix is released under the LGPL v2.1.