[mpich-discuss] Not able to run MPI program parallely...

[Albert Spade]

Hi I want to run my program parallely on the my small cluster. It  has 5
nodes one master and 4 compute nodes.
When I run the below program on invidual machine it works fine and give
proper output. But if I run it on cluster it gives below error.
I disabled firewall.

OUTPUT....
-----------------
[root at beowulf ~]# mpiexec -n 4 ./cpi
Process 2 of 4 is on beowulf.master
Process 3 of 4 is on beowulf.master
Process 1 of 4 is on beowulf.master
Process 0 of 4 is on beowulf.master
Fatal error in PMPI_Reduce: Other MPI error, error stack:
PMPI_Reduce(1270)...............: MPI_Reduce(sbuf=0xbfa66ba8,
rbuf=0xbfa66ba0, count=1, MPI_DOUBLE, MPI_SUM, root=0, MPI_COMM_WORLD)
failed
MPIR_Reduce_impl(1087)..........:
MPIR_Reduce_intra(895)..........:
MPIR_Reduce_binomial(144).......:
MPIDI_CH3U_Recvq_FDU_or_AEP(380): Communication error with rank 2
MPIR_Reduce_binomial(144).......:
MPIDI_CH3U_Recvq_FDU_or_AEP(380): Communication error with rank 1
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