Hi, I am looking too for a file example of rules for dynamic collectives, Have anybody tried it ? Where can I find a proper syntax for it ?
thanks. Lenny. On Thu, Jul 23, 2009 at 3:08 PM, Igor Kozin <i.n.ko...@googlemail.com>wrote: > Hi Gus, > I played with collectives a few months ago. Details are here > http://www.cse.scitech.ac.uk/disco/publications/WorkingNotes.ConnectX.pdf > That was in the context of 1.2.6 > > You can get available tuning options by doing > ompi_info -all -mca coll_tuned_use_dynamic_rules 1 | grep alltoall > and similarly for other collectives. > > Best, > Igor > > 2009/7/23 Gus Correa <g...@ldeo.columbia.edu>: > > Dear OpenMPI experts > > > > I would like to experiment with the OpenMPI tuned collectives, > > hoping to improve the performance of some programs we run > > in production mode. > > > > However, I could not find any documentation on how to select the > > different collective algorithms and other parameters. > > In particular, I would love to read an explanation clarifying > > the syntax and meaning of the lines on "dyn_rules" > > file that is passed to > > "-mca coll_tuned_dynamic_rules_filename ./dyn_rules" > > > > Recently there was an interesting discussion on the list > > about this topic. It showed that choosing the right collective > > algorithm can make a big difference in overall performance: > > > > http://www.open-mpi.org/community/lists/users/2009/05/9355.php > > http://www.open-mpi.org/community/lists/users/2009/05/9399.php > > http://www.open-mpi.org/community/lists/users/2009/05/9401.php > > http://www.open-mpi.org/community/lists/users/2009/05/9419.php > > > > However, the thread was concentrated on "MPI_Alltoall". > > Nothing was said about other collective functions. > > Not much was said about the > > "tuned collective dynamic rules" file syntax, > > the meaning of its parameters, etc. > > > > Is there any source of information about that which I missed? > > Thank you for any pointers or clarifications. > > > > Gus Correa > > --------------------------------------------------------------------- > > Gustavo Correa > > Lamont-Doherty Earth Observatory - Columbia University > > Palisades, NY, 10964-8000 - USA > > --------------------------------------------------------------------- > > _______________________________________________ > > users mailing list > > us...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/users > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
