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YARN Forum

how many Childs to run concurrently

  • #47026
    Sun Ww
    Participant

    Hi

    my nodemanage machines have 2*6 cores and enable hyper-threading.
    if I run max 18 YarnChilds on each machine concurrently, the cpu usage is often more than 90%. is it too high?

    if I run max 12 YarnChilds on each machine concurrently, the cpu usage is around 50%. Meanwhile I found the “r” column often shows 10~20 by using vmstat.

    which one should I choose, 18 or 12 ?

    Thank you

  • Author
    Replies
  • #47616

    18 tasks on a 12 core machine is on the edge, but is reasonable. It does look like your workload is cpu intensive, so may be use 15 to hit a balance?

    You may also want to check the number of disks. Running N containers where N > 1.5 * numDisks usually has negative impact on job performance.

    #48399
    Sun Ww
    Participant

    I’ll try it.
    Thank you.

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