From: Alexandre Chauvin (alexandre.chauvin_at_gmail_dot_com)
Date: Fri Nov 03 2006 - 01:30:30 PST
Hello All -- I am facing some issues when trying to run a UPC code on an Opteron Cluster environement. I am quite newbie with UPC so the answer could be very trivial. Could you please have a look? I would like to use my whole cluster to do a sort. But, if the code goes very fast when using 8GB memory with pthreads within a single node, it goes very slow as soon as I try to use multiple nodes. I tried both vapi and mpi conducts -- infiniband interconnect -- but performance was very bad. It went from 1min on 1 node to more than 20mins when using 2nodes! Is it something particular I should do to use multiple nodes mode efficiently?