Set default MPI-IO hint cb_nodes to 1 when using OpenMPI 5.0.5 and priors #1071
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This is because OpenMPI's implementation may serialize the I/O. See open-mpi/ompi#13376
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carns
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Sep 15, 2025
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I am encountered some errors related to configure option For example, if I configure with |
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The |
Make sure it is defined in darshan-runtime/darshan-runtime-config.h
In this case, fall back to the value set in --log-path
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I think this PR is ready to be merged. |
carns
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Sep 16, 2025
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OpenMPI 5.0.5 and priors contain a bug that can corrupt the
Darshan log files. The bug is related to file locking protocols
implemented when data sieving is enabled. Setting hint cb_nodes
to 1 can avoid the bug, but may make writing log files slow.
For more information, see PR #1070,