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/
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