Mahmoud Hanafi wrote:
here is my mpirun command
mpirun -np 128 -env I_MPI_DEVICE rdma:OpenIB-cma -env I_MPI_DEBUG 2
/home/hanafim/HPL/xhpl
What IB adapter are you using and what F/W version (ibstat)?
This might be related to following bug with large RDMA reads:
https://bugs.openfabrics.org//show_bug.cgi?id=736
Try the following:
Set "-env I_MPI_RDMA_MAX_MSG_SIZE 4194304" to workaround the issue. If
it does not help, set I_MPI_RDMA_RNDV_WRITE to enable to use RDMA Write
rendezvous protocol instead of the default RDMA Read.
-arlin
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