[New-bugs-announce] [issue33171] multiprocessing won't utilize all of platform resources

[yanir hainick]

New submission from yanir hainick <yanirh at gmail.com>:

I'm using either multiprocessing package or concurrent.futures for some embarrassingly parallel application.

I performed a simple test: basically making n_jobs calls for a simple function - 'sum(list(range(n)))', with n large enough so that the operation is a few seconds long - where n_jobs > n_logical_cores.

Tried it on two platforms:

first platform:
server with X4 Intel Xeon E5-4620 (8 physical, 16 logical), running 
a 64bit Windows Server 2012 R2 Standard.

***

second platform:
server with X2 Intel Xeon Gold 6138 (20 physical, 40 logical), running a 64bit Windows Server 2016 Standard.

***

first platform reaches 100% utilization.
second platform reaches 25% utilization.

----------
components: Windows
messages: 314600
nosy: paul.moore, steve.dower, tim.golden, yanirh, zach.ware
priority: normal
severity: normal
status: open
title: multiprocessing won't utilize all of platform resources
type: behavior
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33171>
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