release/18.x: [OpenMP] Fix child processes to use affinity_none (#91391) #91479
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@jhuber6 What do you think about merging this PR to the release branch? |
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@jhuber6 , Sorry, I'm not used to backporting. Are you the right person for this? |
When a child process is forked with OpenMP already initialized, the child process resets its affinity mask and sets proc-bind-var to false so that the entire original affinity mask is used. This patch corrects an issue with the affinity initialization code setting affinity to compact instead of none for this special case of forked children. The test trying to catch this only testing explicit setting of KMP_AFFINITY=none. Add test run for no KMP_AFFINITY setting. Fixes: llvm#91098 (cherry picked from commit 73bb8d9)
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Hi @jpeyton52 (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR. |
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Backport 73bb8d9
Requested by: @jpeyton52