[mpich-discuss] Error in MPI call.

Joachim Protze protze at itc.rwth-aachen.de
Wed Apr 29 08:26:30 CDT 2020


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.


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
protze at itc.rwth-aachen.de

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