Fix (APAR):  PI28492

Status:  Fix

Release:  8.5.5.3

Operating System:  AIX,HP-UX,IBM i,Inspur K-UX,Linux,Mac OS,Solaris,Windows,i5/OS,z/OS

Supersedes Fixes:  

CMVC Defect:  xxxxxx

Byte size of APAR:  268970

Date: 2014-11-04

Abstract:  System garbage collection(gc) is getting called very frequently in ND 8.5.5.3 and causing High Cpu Usage.

Description/symptom of problem:  
PI28492 resolves the following problem:

ERROR DESCRIPTION:                                              
System garbage collection(gc) is getting called explicitly      
every 5 seconds, causing very high CPU.                         

LOCAL FIX:                                                      
Reduce maxpercent to less than 100, such as 99, then the        
frequency of the GC should go down.                             

PROBLEM SUMMARY

USERS AFFECTED:
 All users of IBM WebSphere Application
Server

PROBLEM DESCRIPTION:
Extensive calls to Garbage
collection (gc) are causing high CPU
usage

RECOMMENDATION:
None

System garbage colletion(gc) is called at short intervals
which is causing high CPU usage

PROBLEM CONCLUSION:                                             
To avoid frequent garbage colletion(gc)calls we corrected       
the garbage colletion calculation.                              
                                                                
The fix for this APAR is currently targeted for inclusion in    
fix pack 8.5.5.4.  Please refer to the Recommended Updates      
page for delivery information:                                  
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980   


Directions to apply fix:  
Fix applies to Editions:
Release 8.0
__ Application Server (Express or BASE)
_X_ Network Deployment (ND)
__ Edge Components
__ Developer

Install Fix to all WebSphere installations unless special instructions are included below.

Special Instructions: None

NOTE:
The user must:
* Logged in with the same authority level when unpacking a fix, fix pack or refresh pack.
* Be at V1.4.3 or newer of the Installation Manager. Certain iFixes may require a newer version of the Installation Manager and the Installation Manager will inform you during the installation process if a newer version is required.

The IBM Information Center can provide details, if needed, on the use of the Installation Manager to apply the iFixes.
http://publib.boulder.ibm.com/infocenter/install/v1r4/index.jsp.  Shutdown WebSphere Application Server before applying the iFixes.  Restart WebSphere Application Server after applying the iFixes.



Directions to remove fix:  

The IBM Information Center can provide details, if needed, on the use of the Installation Manager to remove the iFixes.
http://publib.boulder.ibm.com/infocenter/install/v1r4/index.jsp.  Shutdown WebSphere Application Server before removing the iFixes.  Restart WebSphere Application Server after removing the iFixes.



Directions to re-apply fix:  
1) Shutdown WebSphere Application Server.

2) Follow the Fix instructions to apply the fix.

3) Restart WebSphere Application Server.





Additional Information: