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Some multi-threading fixes #9302

Merged
merged 2 commits into from
Aug 24, 2021
Merged

Some multi-threading fixes #9302

merged 2 commits into from
Aug 24, 2021

Commits on Aug 24, 2021

  1. ompi/request: Add a read memory barrier to sync the receive buffer so… 

    …on after wait completes.

We found an issue where with using multiple threads, it is possible for the data
to not be in the buffer before MPI_Wait() returns. Testing the buffer later after
MPI_Wait() returned would show the data arrives eventually without the rmb().

We have seen this issue on Power9 intermittently using PAMI, but in theory could
happen with any transport.

Signed-off-by: Austen Lauria <awlauria@us.ibm.com>
    @AboorvaDevarajan @awlauria
    AboorvaDevarajan authored and awlauria committed Aug 24, 2021
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  2. Allow mpi_init_thread to override the MPI_THREAD_LEVEL 

    Signed-off-by: Austen Lauria <awlauria@us.ibm.com>
    @AboorvaDevarajan @awlauria
    AboorvaDevarajan authored and awlauria committed Aug 24, 2021
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