[mpich-discuss] error with MPI_Reduce running cpi

[Jinang_Shah]

>> $ mpiexec -n 2 -f hostfile ./mpi/mpich-3.3.1/examples/cpi
>> Process 1 of 2 is on csews2
>> Process 0 of 2 is on csews1
>> Fatal error in PMPI_Reduce: Unknown error class, error stack:
>> PMPI_Reduce(523)................: MPI_Reduce(sbuf=0x7ffeab580c10, rbuf=0x7ffeab580c18, count=1, datatype=MPI_DOUBLE, op=MPI_SUM, root=0, comm=MPI_COMM_WORLD) failed
>> PMPI_Reduce(509)................: 
>> MPIR_Reduce_impl(316)...........: 
>> MPIR_Reduce_intra_auto(231).....: 
>> MPIR_Reduce_intra_binomial(125).: 
>> MPIDI_CH3U_Recvq_FDU_or_AEP(629): Communication error with rank 1 
>> 
>> Can anyone explain this error and how to overcome it.I have installed just MPICH and not HYDRA package. 
>> 
>> By the way this same command works fine with hello program the one where each node says their identity.
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