New submission from M J Harvey <moonbug1...@gmail.com>:
multiprocessing's default assumption about Pool size is os.cpu_count() ie all
the cores visible to the OS.
This is tremendously unhelpful when running multiprocessing code inside an HPC
batch system (PBS Pro in my case), as there's no way to hint to the code that
the # of cpus actually allocated to it may be fewer.
It's quite tedious to have to explain this to every single person trying to use
Proposal: multiprocessing should look for a hint for default Pool size from the
environment variable "NCPUS" which most batch systems set. If that's not set,
or its value is invalid, fall back to os.cpu_count() as before
components: Library (Lib)
nosy: M J Harvey
title: multiprocessing, default assumption of Pool size unhelpful
versions: Python 3.6
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