Re: [OMPI users] Bug with 1.2.5?

[George Bosilca]

I'm not very familiar with Fortran 90, but the code looks wrong to me. Here is a snippet from the code:

     call MPI_ISEND(VTMP,int(NCFACES(I)),MPI_FP,NZINT(I)-1, &



     deallocate(VTMP)





  george.

int(GLOBINT(I)),AVUS_COMM_WORLD,REQUEST(MXIPZ +I),IERR) The problem seems to come from the fact that you start a non blocking send and then you release the buffer, which is completely illegal !!! The free should happen only once you know the send is completed, which means after the MPI_Waitall. This works with MPICH because they buffer data in some cases. And works for Open MPI on small problem sizes, because then the message can be send directly without buffering. However, once you're over the eager limit, a rendez-vous message is required, and the MPI_Isend will be completed only later. On Mar 17, 2008, at 12:33 PM, Grismer, Matthew J Civ USAF AFMC AFRL/ RBAC wrote:

I traced it down to the section of code included that is in
fail_section.F.

The platform is a Mac Pro running Mac OS X 10.5.2, but I also tried it
on Mac OS X Server 10.4.11 (Xserve Xeon) with the same result. Also
tried compiling OpenMPI with the Intel C/C++ compilers (version
10.1.012), same result.


with OpenMPI on this platform for small problems. Issue shows up when
running larger problems. Using MPICH2 on this platform with same large
problem runs fine.


end of the code section; the MPI_IRECV and MPI_ISEND statements
complete.

Any help is greatly appreciated.

_____________________________________________________
Matthew Grismer


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I've attached the requested configuration and ompi_info output, as well as the actual error messages that appear (run.out) when the code is run. The code has been run without issue on numerous HPC platforms, and runs The issue appears to occur when calling the MPI_WAITALL statement at the < run .out > < config .log .gz > < fail_section .F><mpi_info.txt.gz>_______________________________________________

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