forked from lix-project/lix
![]() 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:🧵:hardware_concurrency() if cgroups v2 is not detected.
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.. | ||
build-remote | ||
libcmd | ||
libexpr | ||
libfetchers | ||
libmain | ||
libstore | ||
libutil | ||
nix | ||
nix-build | ||
nix-channel | ||
nix-collect-garbage | ||
nix-copy-closure | ||
nix-env | ||
nix-instantiate | ||
nix-store | ||
resolve-system-dependencies | ||
toml11 |