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Subject: [OMPI users] Progress of the asynchronous messages
From: vladimir marjanovic (mrdzy_at_[hidden])
Date: 2008-11-06 10:19:09


Hi, I am new user of Open MPI, I've used MPICH before. There is performance bug with the following scenario: proc_B: MPI_Isend(...,proc_A,..,&request) do{ sleep(1); MPI_Test(..,&flag,&request); count++ }while(!flag); proc_A: MPI_Recv(...,proc_B); For message size 8MB, proc_B calls MPI_Test 88 times. It means that point to point communication costs 88 seconds. Btw, bandwidth isn't the problem (interconnection network: InfiniBand) Obviously, there is the problem with progress of the asynchronous messages. How can I avoid this problem? Thank you very much. Vladimir