Topic
2 replies Latest Post - ‏2013-07-08T18:00:13Z by RFS
RFS
RFS
2 Posts
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Pinned topic P7 795 Run Queue Size Question

‏2013-07-02T18:58:04Z |

I have a P7 795 (SMT-4)  LPAR with 1.5 entitled CPUs and 8 virtual CPUs.  I create daily NMON files with 1 minute snapshots.

During my peak busy period there are at most 3 physical CPU units used.  Generally, during steady state there are 1.8  physical CPU units used on average.

However, I noticed the RunQueue is continually reporting an averaage value of 4.

Why is my RunQueue always occupied when I have 8 virtual CPUs?

  • enmanasu
    enmanasu
    25 Posts
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    Re: P7 795 Run Queue Size Question

    ‏2013-07-08T13:22:34Z  in response to RFS

    Hi,

    Is there lot of i/o happening ...? 

     

    shan

    • RFS
      RFS
      2 Posts
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      Re: P7 795 Run Queue Size Question

      ‏2013-07-08T18:00:13Z  in response to enmanasu

      I am seeing an average < 2,000 IO/s when the run queue is at the highest.

      See attached graph.

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