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 <terry_at_[hidden]>
> 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.
> Dr. Terry Frankcombe
> Research School of Chemistry, Australian National University
> Ph: (+61) 0417 163 509 Skype: terry.frankcombe
> users mailing list
Ing. Gabriele Fatigati
CINECA Systems & Tecnologies Department
Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
www.cineca.it Tel: +39 051 6171722
g.fatigati [AT] cineca.it