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Description of problem: I noticed that support for MPI_THREAD_MULTIPLE has been turned on. As I understand it, that causes a significant performance hit and doesn't work correctly with all BTLs in 1.10, specifically not openib, which is why it's not the default. I haven't done the experiment, though. Apologies if that's wrong, but it's worth confirming the situation. I'd thought before of suggesting it could be enabled in a parallel package that's selectable via modules for that reason. It actually seems rarely needed; there's only one thing I've installed that had to be built with mvapich. Version-Release number of selected component (if applicable): 1.10.4-4.fc25
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This bug appears to have been reported against 'rawhide' during the Fedora 30 development cycle. Changing version to '30.
At this point, this isn't even an option to enable or disable in openmpi.