Hi Chafik, You can find examples using MPI_GATHERV if you google it. Here are some I found: http://mpi.deino.net/mpi_functions/MPI_Gatherv.html http://www.mpi-forum.org/docs/mpi-1.1/mpi-11-html/node70.html Please use this mailing list to ask questions related to MPICH. For general questions, I would suggest to use other developer websites, e.g., http://stackoverflow.com/. Best, Sangmin On Dec 4, 2014, at 10:27 AM, Chafik sanaa <[email protected]<mailto:[email protected]>> wrote: hi I want a simple program with the function MPI_GATHERV _______________________________________________ discuss mailing list [email protected]<mailto:[email protected]> To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss