Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Open MPI User's mailing list

Subject: Re: [OMPI users] trouble_MPI
From: Jeff Squyres (jsquyres) (jsquyres_at_[hidden])
Date: 2012-09-18 17:36:27


This type of error usually occurs when you try to allocate too much memory on the stack. Try allocating your array from the heap.

Sent from my phone. No type good.

On Sep 18, 2012, at 5:16 PM, "Alidoust" <phymalidoust_at_[hidden]<mailto:phymalidoust_at_[hidden]>> wrote:

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

pmem=10gb,nodes=20:ppn=2

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,
Mohammad
_______________________________________________
users mailing list
users_at_[hidden]<mailto:users_at_[hidden]>
http://www.open-mpi.org/mailman/listinfo.cgi/users