I encountered an error with send/recv pairs on AMD64. The first send completes successfully, but subsequent send/recv pairs hang. I also believe that MPI_Bcast also hangs under simmilar conditions, but have not created an explicit testcase for this (it happened in the code I was working on). Both machines are running AMD64 processors.
The problem only manifests when the tasks are on seperate machines. The problem does not occur on x86 (32-bit) machines. Thanks! Charles Shuller
mpi_send_recv_test.tar.bz2
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