More in depth, total execution time without Barrier is about 10000 sec.
Total execution time with Barrier+Reduce is 9453, with 128 procs. 2010/9/9 Terry Frankcombe <te...@chem.gu.se> > Gabriele, > > Can you clarify... those timings are what is reported for the reduction > call specifically, not the total execution time? > > If so, then the difference is, to a first approximation, the time you > spend sitting idly by doing absolutely nothing waiting at the barrier. > > Ciao > Terry > > > -- > Dr. Terry Frankcombe > Research School of Chemistry, Australian National University > Ph: (+61) 0417 163 509 Skype: terry.frankcombe > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > > -- Ing. Gabriele Fatigati Parallel programmer CINECA Systems & Tecnologies Department Supercomputing Group Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy www.cineca.it Tel: +39 051 6171722 g.fatigati [AT] cineca.it
