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Subject: [OMPI users] trouble_MPI
From: Alidoust (phymalidoust_at_[hidden])
Date: 2012-09-18 17:14:27

Dear Madam/Sir,

I have a serial Fortran code (f90), dealing with matrix diagonalizing
subroutines, and recently got its parallel version to be faster in some
unfeasible parts via the serial program.
I have been using the following commands for initializing MPI in the code
    call MPI_INIT(ierr)
    call MPI_COMM_SIZE(MPI_COMM_WORLD, p, ierr)
    call MPI_COMM_RANK(MPI_COMM_WORLD, my_rank, ierr)

CPU requirement >> pmem=1500mb,nodes=5:ppn=8 <<
Everything looks OK when matrix dimensions are less than 1000x1000. When I
increase the matrix dimensions to some larger values the parallel code gets
the following error
mpirun noticed that process rank 6 with PID 1566 on node node1082 exited on
signal 11 (Segmentation fault)
There is no such error with the serial version even for larger matrix
dimensions than 2400x2400. I then thought it might be raised by the number
of nodes and memory space I'm requiring. Then changed it as follows


which is more or less similar to what I'm using for serial jobs (
mem=10gb,nodes=1:ppn=1). But the problem persists still. Is there any
limitation on MPI subroutines for transferring data size or the issue would
be raised by some cause else?

Best of Regards,