I just looked at the gsend_buffer, that's actually all zeros as well, and each send_buffer is not. So i think my problem is there. On May 1, 2013, at 4:47 PM, Rajeev Thakur wrote:

The count passed to MPI_Scatter should be the local size, i.e., the amount that gets sent to each process. Looks like what is being passed is the global size.

On May 1, 2013, at 6:21 PM, Ryan Crocker wrote:

...

Hi all,

So i don't know what the issue with this code snippet is but i cannot get the scatter call to work. When i print out the recieve_buffer it comes out as all zeros. The counters without the underscore are the core domains, with the o, the global domains.

rec_count = (imaxo-imino+1)*(jmaxo-jmino+1)*(kmaxo-kmino+1) send_count = (imax_-imin_+1)*(jmax_-jmin_+1)*(kmax_-kmin_+1)

call MPI_GATHER (send_buffer, send_count, MPI_REAL, gsend_buffer, send_count, MPI_REAL, iroot, comm, ierr)

rec_count = (imaxo-imino+1)*(jmaxo-jmino+1)*(kmaxo-kmino+1) send_count = (imaxo-imino+1)*(jmaxo-jmino+1)*(kmaxo-kmino+1)

call MPI_SCATTER (gsend_buffer, send_count, MPI_REAL, recieve_buffer, rec_count, MPI_REAL, iroot, comm, ierr)

thanks for the help.

Ryan Crocker University of Vermont, School of Engineering Mechanical Engineering Department [email protected]

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Ryan Crocker University of Vermont, School of Engineering Mechanical Engineering Department [email protected] 315-212-7331