Commits on Aug 25, 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>
   (cherry picked from commit 12192f1)

   

   AboorvaDevarajan authored and awlauria committed Aug 25, 2021
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