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The error message says process 0 tried to connect to process 1 and the connection is refused. Common reason is firewall rules. The processes listen on a random port such as 23456, so even when ssh works (port 22), the other ports may be still blocked.
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Hui Zhou</div>
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<div class="">On Jun 17, 2019, at 11:28 AM, Jinang_Shah <<a href="mailto:sjinang@iitk.ac.in" class="">sjinang@iitk.ac.in</a>> wrote:</div>
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<p class="">1) $ ./configure --prefix=/users/misc/sjinang/mpich-install</p>
<p class="">2) No. It is showing an error : mpiexec -n 2 -f hostfile ./mpi/mpich-3.3.1/examples/send_recv<br class="">
Fatal error in PMPI_Send: Unknown error class, error stack:<br class="">
PMPI_Send(159).............: MPI_Send(buf=0x7ffe5d59e2a4, count=1, MPI_INT, dest=1, tag=0, MPI_COMM_WORLD) failed<br class="">
MPID_nem_tcp_connpoll(1845): Communication error with rank 1: Connection refused</p>
<p class="">3) I have done ssh from both the sides and its working fine. So now can you see the problem...</p>
<p class="">Thanks.</p>
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<p class="">On 17-06-2019 21:28, Zhou, Hui wrote:</p>
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<!-- html ignored --><!-- head ignored --><!-- meta ignored -->Hi Jinang_Shah,
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<div class="">Could you list your configure line ( try `head config.log`)?</div>
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<div class="">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 class="">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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Hui Zhou</div>
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<div class="">On Jun 17, 2019, at 10:11 AM, Jinang_Shah via discuss <<a href="mailto:discuss@mpich.org" class="">discuss@mpich.org</a>> wrote:</div>
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<p class="">$ mpiexec -n 2 -f hostfile ./mpi/mpich-3.3.1/examples/cpi<br class="">
Process 1 of 2 is on csews2<br class="">
Process 0 of 2 is on csews1<br class="">
Fatal error in PMPI_Reduce: Unknown error class, error stack:<br class="">
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 class="">
PMPI_Reduce(509)................: <br class="">
MPIR_Reduce_impl(316)...........: <br class="">
MPIR_Reduce_intra_auto(231).....: <br class="">
MPIR_Reduce_intra_binomial(125).: <br class="">
MPIDI_CH3U_Recvq_FDU_or_AEP(629): Communication error with rank 1</p>
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<p class="">Can anyone explain this error and how to overcome it.I have installed just MPICH and not HYDRA package.</p>
<p class="">By the way this same command works fine with hello program the one where each node says their identity.</p>
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