[mpich-discuss] Error in MPI call.

[hritikesh semwal]

Hello all,

Greetings of the day.

I am working on the development of a parallel CFD solver in which I am
using distributed graph communicator with MPI neighbourhood
collective operation MPI_Neighbor_alltoallw. While running on 2 and 4
processors, the code is working fine but when I tried it on 8 processors it
is showing following error,

Fatal error in PMPI_Neighbor_alltoallw: Unknown error class, error stack:
PMPI_Neighbor_alltoallw(299)..............:
 MPI_Neighbor_alltoallw(sendbuf=0x2fa8c20, sendcounts=0x1cd2300,
sdispls=0x1cd2270, sendtypes=0x1cd2180, recvbuf=0x2fac1d0,
recvcounts=0x7f167615d010, rdispls=0x7f1667ace010,
recvtypes=0x7f1660786010, comm=comm=0x84000002)
PMPI_Neighbor_alltoallw(285)..............:
MPIR_Neighbor_alltoallw_impl(174).........:
MPIR_Neighbor_alltoallw_intra_auto(93)....:
MPIR_Neighbor_alltoallw_nb(33)............:
MPIR_Wait_impl(77)........................:
MPIDI_CH3i_Progress_wait(242).............: an error occurred while
handling an event returned by MPIDI_CH3I_Sock_Wait()
MPIDI_CH3I_Progress_handle_sock_event(479):
MPIDI_CH3I_Socki_handle_read(4013)........: connection failure
(set=0,sock=1,errno=104:Connection reset by peer)

Can anyone tell me what is the solution to this problem? This would be a
great help.

Thank you.
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