CPU utilization problem when running parallel Fluent on Windows HPC 2008R2
Hello,
I have just reinstalled Windows HPC 2008R2 on a small cluster costituted of one head node and nine compute nodes (8 cores each), where we are running some CFD codes such as Fluent or Star-CCM+.
When I am running some benchmarks with both codes, I get a good scalability up to 16 cores (on 2 nodes), but the performance drops suddenly when adding one more core. Moreover when monitoring the task manager, I figured out that the CPU utilization
on the compute nodes was varying between 25% and 50% when I submitted a computation on three nodes while it was 100% on two nodes (16 cores). I have to precise that in a previous installation of Windows HPC 2008R2 on the same nodes, I could reach good
scalability when increasing the number of nodes.
I would be very grateful if someone had any idea on the source of the problem. Thank you!
Antoine
May 5th, 2012 4:03pm
I would have ask here.
http://social.microsoft.com/Forums/is/windowshpcitpros/threads
Thanks
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May 5th, 2012 4:11pm
Thank you very much, it is indeed better suited to this topic. I just moved it there.
May 5th, 2012 4:26pm
Link to the new thread: http://social.microsoft.com/Forums/en-US/windowshpcitpros/thread/35beb50f-a1d2-4235-a77f-32badcf43f5a/#35beb50f-a1d2-4235-a77f-32badcf43f5a
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May 5th, 2012 4:48pm