Fixes for tags that affected PointQuery on some systems. #1327
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aaroncblack
reviewed
Oct 10, 2024
src/libs/relay/conduit_relay_mpi.cpp
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| { | ||
| return (tag < MPI_TAG_UB) ? ((tag >= 0) ? tag : MPI_TAG_UB) : MPI_TAG_UB; | ||
| // Get the tag upper bound for the communicator. | ||
| // MPI_Comm_get_attr with MPI_TAG_UB is not a very reliable function. |
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That's always fun :( Thanks for identifying this issue.
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On rzadams, the MPI does not like large tag values. The PointQuery algorithm (and others) were using large tag values. The mechanism put in place to query a communicator's upper tag limit was not quite right before. This PR updates some of that logic and lowers some tag values so they're more likely to work with that MPI.
Also, in relay::mpi::communicate_using_schema it was possible for a user-registered error function to prevent exceptions from being thrown when needed. The class now temporarily suspends user-registered warning/error functions so exceptions will get thrown if MPI errors or other errors occur. This should make errors easier to diagnose.