Fixed unnecessary Pool creation in searchlight#386
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When pool_size=1 the creation of a multiprocessing pool is unnecessary and wasteful because data needs to be copied and sent to other process. This would double the needed memory for each MPI task. In addition, fork() can cause unpredictable behaviour in some MPI implementations, see: https://www.open-mpi.org/faq/?category=tuning#fork-warning
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Can one of the admins verify this patch? |
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Collaborator
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Can one of the admins verify this patch? |
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Jenkins, add to whitelist. |
Member
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Jenkins, retest this please. |
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Author
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Do we need a unit test for pool_size = 1 to get coverage up? Am I reading this correctly? |
Member
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Precisely! |
Contributor
Author
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Ok, I copied one of the previous tests with the only difference being pool_size=1. Test passes and coverage was good on my end. Third times the charm hopefully :) |
mihaic
approved these changes
Oct 16, 2018
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Thanks a lot, @davidt0x! This should make some people happy. :) |
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When pool_size=1 the creation of a multiprocessing pool is unnecessary
and wasteful because data needs to be copied and sent to other process.
This would double the needed memory for each MPI task. In addition,
fork() can cause unpredictable behaviour in some MPI implementations,
see:
https://www.open-mpi.org/faq/?category=tuning#fork-warning