[mpich-discuss] gather, send

[Rajeev Thakur]

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
> rcrocker at uvm.edu
> 
> 
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