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Non blocking scatter and gather #96

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SStroteich opened this issue Sep 23, 2022 · 1 comment
Open

Non blocking scatter and gather #96

SStroteich opened this issue Sep 23, 2022 · 1 comment

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@SStroteich
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Right now the redistribution function uses blocking send and receive commands. This makes the communication very inefficient and should be fixed by using the non blocking commands in redistribute.f90.

@d7919
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d7919 commented Sep 28, 2022

Yes, our experience in GS2 is that swapping for non-blocking communications (and ideally persistent versions of this) can give a good performance improvement in most cases. It's possible on some systems for some problems that posting all send/receive calls at once can cause hardware contention issues which degrade performance but such instances are rare. It may be relatively simple to port the changes from GS2/AGK here?

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