Hi Sreenidhi, you need to specify --collective as an input parameter to mpi_tile_io
kindest regards Mike On 11 May 2016 at 12:01, Sreenidhi Bharathkar Ramesh < sreenidhi-bharathkar.ram...@broadcom.com> wrote: > > Thank you so much for the details. > > > 1. while running the "Tile I/O" benchmark, I see the following message: > > $ mpirun -np 28 ./mpi-tile-io --nr_tiles_x 7 --nr_tiles_y 4 --sz_tile_x > 100 --sz_tile_y 100 --sz_element 32 --filename file1g > ... > # collective I/O off > > How do I enable collective I/O ? > > 2. I switched to using Open MPI v 2.0.0rc2 . How do I know which IO is > being used ? How do I switch between OMPIO and ROMIO ? > > > Please let me know. > > Thanks, > - Sreenidhi. > > > On Tue, May 10, 2016 at 7:14 PM, Edgar Gabriel <egabr...@central.uh.edu> > wrote: > >> in the 1.7, 1.8 and 1.10 series ROMIO remains the default. In the >> upcomgin 2.x series, OMPIO will be the default, except for Lustre file >> systems, where we will stick with ROMIO as the primary resource. >> >> Regarding performance comparison, we ran numerous tests late last year >> and early this year. It really depends on the application scenario and the >> platform that you are using. If you want to know which one should you use, >> I would definitely suggest to stick with ROMIO in the 1.10 series, since >> many of the bug fixes of OMPIO that we did in the last two years could not >> be back-ported to the 1.10 series for technical reasons. If you plan to >> switch to the 2.x series, it might be easiest to just run a couple of tests >> and compare the performance for your application on your platform, and base >> your decision on that. >> >> Edgar >> >> On 5/10/2016 6:32 AM, Sreenidhi Bharathkar Ramesh wrote: >> >> Hi, >> >> 1. During default build of OpenMPI, it looks like both ompio.la and >> romio.la are built. Which I/O MCA library is used and based on what is >> the decision taken ? >> >> 2. Are there any statistics available to compare these two - OMPIO vs >> ROMIO ? >> >> I am using OpenMPI v1.10.1. >> >> Thanks, >> - Sreenidhi. >> >> -- >> >> >> _______________________________________________ >> devel mailing list >> de...@open-mpi.org >> Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/devel >> Link to this post: >> http://www.open-mpi.org/community/lists/devel/2016/05/18951.php >> > > > _______________________________________________ > devel mailing list > de...@open-mpi.org > Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/devel > Link to this post: > http://www.open-mpi.org/community/lists/devel/2016/05/18963.php >
