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 >
