Issue using UPC on Opteron Cluster

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From: Alexandre Chauvin (alexandre.chauvin_at_gmail_dot_com)
Date: Fri Nov 03 2006 - 01:30:30 PST

  • Next message: Dan Bonachea: "Re: Issue using UPC on Opteron Cluster" 
    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?
  • Next message: Dan Bonachea: "Re: Issue using UPC on Opteron Cluster"
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