Hi All, We have a parallel program running on a cluster. We recently found a case, which decreases the CPU usage and increase the run-time when increases Nodes. Below is the results table. The particular run requires a lot of data communication between nodes. Any thoughts about this phenomena? Or is there any way we can improve the CPU usage when using higher number of nodes? Average CPU Usage (%) Number of Nodes Number of Threads/Node 100 1 8 92 2 8 50 3 8 40 4 8 35 5 8 30 6 8 25 7 8 20 8 8 20 8 4 Thanks! -- _________________________________________________________________________ The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer. _________________________________________________________________________ _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss