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<p>1) $ ./configure --prefix=/users/misc/sjinang/mpich-install</p>
<p>2) No. It is showing an error : mpiexec -n 2 -f hostfile ./mpi/mpich-3.3.1/examples/send_recv<br /> Fatal error in PMPI_Send: Unknown error class, error stack:<br /> PMPI_Send(159).............: MPI_Send(buf=0x7ffe5d59e2a4, count=1, MPI_INT, dest=1, tag=0, MPI_COMM_WORLD) failed<br /> MPID_nem_tcp_connpoll(1845): Communication error with rank 1: Connection refused</p>
<p>3) I have done ssh from both the sides and its working fine. So now can you see the problem...</p>
<p>Thanks.</p>
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<p>On 17-06-2019 21:28, Zhou, Hui wrote:</p>
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<div>Could you list your configure line ( try `head config.log`)?</div>
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<div>If you try a simple example where process 0 sends a short message to process 1, would you result in similar error?</div>
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<div>Can csews1 and csews2 connect to each other freely, i.e. is there firewall, router, etc. between these two hosts?</div>
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<div>On Jun 17, 2019, at 10:11 AM, Jinang_Shah via discuss <<a href="mailto:discuss@mpich.org">discuss@mpich.org</a>> wrote:</div>
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<p>$ mpiexec -n 2 -f hostfile ./mpi/mpich-3.3.1/examples/cpi<br /> Process 1 of 2 is on csews2<br /> Process 0 of 2 is on csews1<br /> Fatal error in PMPI_Reduce: Unknown error class, error stack:<br /> PMPI_Reduce(523)................: MPI_Reduce(sbuf=0x7ffeab580c10, rbuf=0x7ffeab580c18, count=1, datatype=MPI_DOUBLE, op=MPI_SUM, root=0, comm=MPI_COMM_WORLD) failed<br /> PMPI_Reduce(509)................: <br /> MPIR_Reduce_impl(316)...........: <br /> MPIR_Reduce_intra_auto(231).....: <br /> MPIR_Reduce_intra_binomial(125).: <br /> MPIDI_CH3U_Recvq_FDU_or_AEP(629): Communication error with rank 1</p>
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<p>Can anyone explain this error and how to overcome it.I have installed just MPICH and not HYDRA package.</p>
<p>By the way this same command works fine with hello program the one where each node says their identity.</p>
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