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[Runtime] use pthread_getaffinity_np to determine default worker count

Merged [Runtime] use pthread_getaffinity_np to determine default worker count
aj46ezos/emper:improve-default-worker-count into master
Merged Florian Fischer requested to merge aj46ezos/emper:improve-default-worker-count into master
  1. Jul 05, 2021
    • Florian Fischer's avatar
      [Runtime] use pthread_getaffinity_np to determine default worker count · 7cb1a828
      Florian Fischer authored 
      The value reported by std::thread::hardware_concurrency() can be more
than the available CPUs to the current process for example if EMPER runs
in a container or qemu.
GNU nproc(1) does the right thing and we can take inspiration from them.
The solution is to use pthread_getaffinity_np which fills a CPU set with
all CPU a pthread can be scheduled on.
We use this more precise CPU count if possible.
      7cb1a828