8d2843715b
Implement computeHostNumHardwareThreads() for FreeBSD This retrieves CPU affinity via FreeBSD's cpuset(2) API, and makes LLVM respect affinity settings configured by the user via the cpuset(1) command. In particular, this allows to reduce the number of threads used on machines with high core counts, which can interact badly with parallelized build systems. This is particularly noticable with lld, which spawns lots of threads even for linking e.g. hello_world! This fix is related to PR48193, but does not adress the more fundamental problem, which is that LLVM by default grabs as many CPUs and/or threads as possible. Reviewed By: MaskRay Differential Revision: https://reviews.llvm.org/D92271 Originally by: mjg MFC after: 1 week
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