Hello, can you reproduce the error with a minimal code example: Just create the communicator and call the collective as in your application? Such code would make it easier for people to help you with the issue. Probably understand, whether the issue is in the code or in the MPI library. Best Joachim Am 29.04.20 um 03:43 schrieb hritikesh semwal via discuss:
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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-- Dipl.-Inf. Joachim Protze IT Center Group: High Performance Computing Division: Computational Science and Engineering RWTH Aachen University Seffenter Weg 23 D 52074 Aachen (Germany) Tel: +49 241 80- 24765 Fax: +49 241 80-624765 [email protected] www.itc.rwth-aachen.de