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Systems

CPU usage low BUT queue high

    • JerrySu
      Subscriber

      hello there,

      I am new to the Fluent, and in my case, My server's CPU is 2 Intel 8280, and while I run the ansys fluent, it never go full 100%, and it looks like can't use 100% CPU capacity.

      as below screenshot, the server total has 112 logical processors .

      what I did try: as below , Set Processes to 112 or 56 (real Core), But the cpu still not running 100% each core or logical processors. 

      and my monitor server told the CPU queue is high. what Did I missed?

    • Karthik R
      Administrator
      Hello I've two thoughts:
      I believe the 8280's are quad sockets and not recommended because of performance issues with the bus being overloaded but confirm if these are quad.
      It could be they have hyperthreading enabled. Could you please disable this?
      Please let me know your findings.
      Karthik
    • JerrySu
      Subscriber
      As I check, the 8180 is quad CPU, but 8280 is dual.
      I disabled the hypertherading and the preformance seems more worse ...
    • Karthik R
      Administrator
      Hello Could you please start a transcript file Read cas and dat
      do 100 iterations or so
      Go to the Usage menu to print out usage data
      Stop transcript file
      Could you please share the screenshot of the usage here?
      Karthik
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