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hang in init with high ppn #7175

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raffenet opened this issue Oct 16, 2024 · 2 comments
Open

hang in init with high ppn #7175

raffenet opened this issue Oct 16, 2024 · 2 comments
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aurora

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@raffenet
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MPI_Init hangs on Aurora. Reliably reproducible with nodes=700,ppn=96. Backtrace suggests it is stuck in PMIx_Fence, possibly in shm file handle sharing. Adding back full PMIx_Fence barrier during init works around the problem.
@hzhou
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hzhou commented Oct 17, 2024

The top suggestion is to try Openpmix latest release (5) to see if the issue reproduces.

@hzhou
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hzhou commented Nov 13, 2024

Note: while the PMIx_fence issue is not resolved, a work around is to do a PMI_Barrier at init, which prevents the PMIX_fence leak.

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@raffenet @hzhou