My Oracle Support Banner

High System time with lock contention due to Oracle Database calling setitimer which calls uniqtime which locks tod_lock (Doc ID 1616790.1)

Last updated on NOVEMBER 26, 2019

Applies to:

Solaris Operating System - Version 10 3/05 and later
Information in this document applies to any platform.

Symptoms

High sytem time and possibly large run queue with lockstat showing something similar to:

 

Adaptive mutex spin: 222112 events in 2.558 seconds (86834 events/sec)

-------------------------------------------------------------------------------
Count indv cuml rcnt     nsec Lock                   Hottest Caller
217378  99%  99% 0.00   508095 tod_lock[8]            uniqtime+0x8

      nsec ------ Time Distribution ------ count     Stack
       512 |                               10        xsetitimer+0x1e4
      1024 |                               137       setitimer+0x60
      2048 |                               339       syscall_trap+0xac
      4096 |                               1583
      8192 |@@@@@@@@@@@@@@@@@@@@@@         163416
     16384 |@                              7717
     32768 |@                              12084
     65536 |                               3710
    131072 |                               1998
    262144 |                               1767
    524288 |                               1796
   1048576 |                               2459
   2097152 |                               3985
   4194304 |                               5608
   8388608 |@                              8565
  16777216 |                               1873
  33554432 |                               244
  67108864 |                               76
 134217728 |                               8
 268435456 |                               3
-------------------------------------------------------------------------------  
...
...

 

And thread stacks showing something simiar to:

...

...

00000306a7460ae0      3067704b978      3066bf7d800   1  21                0
  PC: turnstile_block+0x5fc    CMD: oraclefinindp1 (LOCAL=NO)
  stack pointer for thread 306a7460ae0: 2a109034ed1
  [ 000002a109034ed1 turnstile_block+0x5fc() ]
    mutex_vector_enter+0x428()
    uniqtime+8()
    xsetitimer+0x1e4()
    setitimer+0x60()
    syscall_trap+0xac()
...
...

 

 

 

Changes

 N/A

Cause

To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!


In this Document
Symptoms
Changes
Cause
Solution


My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.