Yes, Bruck for barrier is a variant of the dissemination algorithm as described in: - Debra Hensgen, Raphael Finkel, and Udi Manbet. Two algorithms for barrier synchronization. International Journal of Parallel Programming, 17(1):1–17, 1988.
George. On Jun 29, 2013, at 12:05 , Ronny Brendel <ronnybren...@gmail.com> wrote: > Hi, > > I am digging through openmpi to find out what algorithm the barrier actually > uses. > seems to be bruck/dissemination. > > However i stumbled upon something odd. > in: ompi/mca/coll/tuned/coll_tuned_barrier.c > function: ompi_coll_tuned_barrier_intra_bruck > > I think you intend (by the comments and the function name) to send to the > previous node and receive from the next. But actually it looks like you are > doing the reverse. (which should then be the dissemination algorithm) > > It's no big deal, I'm just a bit confused right now, and wonder if I'm > missing something. I hope you can help me understand. > > cheers, > Ronny > _______________________________________________ > devel mailing list > de...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/devel
