to use ompio mpirun --mca io ompio ... to use romio (v2.x) mpirun --mca io romio314 ... to use romio (v1.10) mpirun --mca io romio ...
Cheers, Gilles On Wednesday, May 11, 2016, Michael Rezny <michael.re...@monash.edu> wrote: > 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 > <javascript:_e(%7B%7D,'cvml','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 >> <javascript:_e(%7B%7D,'cvml','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 <javascript:_e(%7B%7D,'cvml','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 <javascript:_e(%7B%7D,'cvml','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 >> > >
