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 This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner 2010 / 2011 Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows 7, Configuring Microsoft Certified Technology Specialist: Designing and Providing Volume Licensing Solutions to Large Organizations Microsoft Certified IT Professional: Enterprise Administrator Microsoft Certified IT Professional: Server Administrator Microsoft Certified Trainer
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May 5th, 2012 4:48pm

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