Salve Ricardo Reis! Como vai a Radio Zero?
Doesn't this serialize the I/O operation across the processors, whereas MPI_Gather followed by rank_0 I/O may perhaps move the data faster to rank_0, and eventually to disk (particularly when the number of processes is large)? I never thought of your solution, hence I never tried/tested/compared it to my common wisdom suggestion to Derek either. So, I really don't know the answer. Abrac,o Gus Ricardo Reis wrote:
If using the master/slace IO model, would it be better to cicle through all the process and each one would write it's part of the array into the file. This file would be open in "stream" mode...like do p=0,nprocs-1 if(my_rank.eq.i)then openfile (append mode) write_to_file closefile endif call MPI_Barrier(world,ierr) enddo cheers, Ricardo Reis 'Non Serviam' PhD candidate @ Lasef Computational Fluid Dynamics, High Performance Computing, Turbulence http://www.lasef.ist.utl.pt Cultural Instigator @ Rádio Zero http://www.radiozero.pt Keep them Flying! Ajude a/help Aero Fénix! http://www.aeronauta.com/aero.fenix http://www.flickr.com/photos/rreis/ < sent with alpine 2.00 > ------------------------------------------------------------------------ _______________________________________________ users mailing list us...@open-mpi.org http://www.open-mpi.org/mailman/listinfo.cgi/users
