From: Hubert Ritzdorf <ritzdorf@XXXXXXXXXXXX>
Date: January 23, 2008 12:00:55 PM CST
To: mpi-21@XXXXXXXXXXXXX
Subject: Re: [mpi-21] Proposal EH2 & MPI_INPLACE
Reply-To: mpi-21@XXXXXXXXXXXXX



Erez Haba wrote:
> Using the send buffer pointer?
>
> Can you give an example?
>
>
If you define 2 derived datatypes send_type and recv_type, which don't
overlap,  you can execute for example MPI_Gather in the following way

{
    int buf[1000];

     MPI_Gather (buf, 1, send_type, buf, 1, recv_type, 0,  
MPI_COMM_WORLD);

   ....

}

In this case buf is send and recv buffer of MPI_Gather and
buf is IN and OUT argument of MPI_Gather in root process 0.


Hubert