To measure time, just write "time" in the command line when you execute your application:
time mpirun -np 16 myapplication
I'm not sure how you'd do what you want with MPI_Gather, but since only the root process will have the 2 dimensinal array, you could do it using MPI_Send in all the processes and various MPI_Recv on the root process, according to the rank of the sending process you can identify in which position of the 2 dimensional array the data will be placed.
example (supposing you hava an array of int):
//root process
if (my_rank==0){
for (i = 1; i<array_size; i++){
MPI_Recv(&matrix[i][0], array_size, MPI_INT, i, 0, MPI_COMM_WORLD, &status)
}
}else{ //every other process
MPI_Send(array, array_size, MPI_INT, 0, 0, MPI_COMM_WORLD)
}
Good luck!
--- Em qua, 28/10/09, lam-request_at_[hidden] <lam-request_at_[hidden]> escreveu:
De: lam-request_at_[hidden] <lam-request_at_[hidden]>
Assunto: lam Digest, Vol 1285, Issue 1
Para: lam_at_[hidden]
Data: Quarta-feira, 28 de Outubro de 2009, 14:00
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