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Thread: long spins

  1. #1
    Join Date
    Apr 2004
    Location
    zxczxczxc
    Posts
    52

    Unanswered: long spins

    hi,

    The below output shows the number of long spins occured on a resource. how is it possible to reduce these spins.


    Informix Dynamic Server Version 9.30.FC2W8 -- On-Line -- Up 1 days 05:14:48 -- 11053768 Kbytes

    Spin locks with waits:
    Num Waits Num Loops Avg Loop/Wait Name
    50 594714338 11894286.76 mtcb vproc_sync_lock
    25 5338037 213521.48 mtcb tcb_queue_lock
    16 489833 30614.56 mtcb vproc_list_lock
    82 4901068 59769.12 mtcb notify_lock
    2 21715 10857.50 cond lock, name = netnorm
    1 12032 12032.00 tcb lock, tid = 70
    3 150022 50007.33 tcb lock, tid = 2935
    103049 1295334176 12570.08 shmcb sh_lock
    58 904733 15598.84 pool po_lock, name = aio


    bye.
    zxczxczc

  2. #2
    Join Date
    Aug 2003
    Location
    Argentina
    Posts
    780
    Hi Pathri

    What is the problem ??

  3. #3
    Join Date
    Apr 2004
    Location
    zxczxczxc
    Posts
    52

    long spins

    Hi,
    The Avg wait/loop column in the output shows that the value is exceeded more than 10000(10000 loops make 1 long spin). This means on the particular resource (in Name column) the system has to wait to acquire it. I want to know what does the names like "mtcb vproc_sync_lock","mtcb tcb_queue_lock","mutex lock, name = tx" mean so that i can increase the values for this parameters to reduce the waits on them.


    bye.
    zxczxczc

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