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
