AIX: osysmond.bin High CPU Usage
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APPLIES TO:
Oracle Database - Enterprise Edition - Version 11.2.0.3 and laterIBM AIX on POWER Systems (64-bit)
SYMPTOMS
11gR2 or 12cR1 Grid Infrastructure on AIX, observed high CPU usage by osysmond.bin
Name PID CPU% PgSp Owner PageIn 0 PAGING SPACE
osysmond 11993226 16.7 153.1 root PageOut 0 Size,MB
20480
root 14286918 1 7 Jan 06 - 1121:16/grid/product/11.2.0/bin/osysmond.bin ##>> high accumulated CPU usage
oracle 17760308 17367264 19 Jan 06 - 388:35 /grid/product/11.2.0/bin/ocssd.bin
root 7602414 1 23 Jan 06 - 381:56 /grid/product/11.2.0/bin/crsd.bin reboot
CAUSE
SOLUTION
Case 1 - high number of disks
The issue happens when there's high number of disks. The disk stat collection is expensive on AIX, this isn't an Oracle issue, it's being jointly worked by IBM and Oracle via bug 13987807
Duplicate bugs: bug 13605859 bug 13614667 bug 13705498 bug 13950866 bug 14221669 bug 14213360
If the high CPU usage has an impact, while IBM is still working to improve disk stat collection API, fix for bug 13987807 should be applied. Refer to note 13987807.8 for details of fixed version. The fix will disable disk stat collection if there's more than 100 disks.
Case 2 - high number of open file descriptor
The issue happens when there's high number of open file descriptor. The traverse of open file descriptor is expensive on AIX, this isn't an Oracle issue, it's being jointly worked by IBM and Oracle via bug 16901346
Duplicate bugs: bug 17056186 bug 18543509
If the issue has an impact, while IBM is still working to enhance the code, fix for bug 16901346 should be applied. Refer to note 16901346.8 for more information.
REFERENCES
BUG:13605859 - AIX: OSYSMOND.BIN USES MORE CPU THAN OCSSD.BIN CRSD.BIN AND EVMD.BIN COMBUG:13614667 - 11.2.0.3 OSYSMOND HIGH CPU USAGE
原来这个进程那么多bug...
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