PQ67566: PERFORMANCE DEGRADATION BEING CAUSED BECAUSE OF DELAY IN GARBAGECOLLECTION OF SESSION OBJECTS. | |||||||||||||||||||||||||||||||||||||||
![]() |
|||||||||||||||||||||||||||||||||||||||
![]() APAR status Closed as program error. Error description Customer was running a high stress testcase. After a period of time they noticed a significant performance degradation. When they looked at GC stats, the heap utilization was increasing and the amount of time that the jvm was taking to do GC was increasing. An analysis of the java heap showed that there were a number of HttpSession objects in the heap that were not getting garbage collected. KeyWords: slow performance heap growth GCLocal fix Problem summary **************************************************************** * USERS AFFECTED: WebSphere Application Server -- Session * * Manager Users * **************************************************************** * PROBLEM DESCRIPTION: Performance slowdown is being caused * * by delay in garbage collection of * * Session Objects. * **************************************************************** * RECOMMENDATION: * **************************************************************** The Session Objects after getting timed out are eligible for removal from the JVM by the garbage collection thread. Since the session object overrides the finalize method the garbage collecton thread takes longer to perform the removal operation of the session object from the JVM leading to performance degradation.Problem conclusion This fix removes the overridden finalize method implementation from the session object causing its removal from the JVM to take place much more quickly.Temporary fix Comments
APAR is sysrouted FROM one or more of the following: APAR is sysrouted TO one or more of the following: PQ65717 Modules/Macros
SRLS
|
Document Information |
Product categories: Software > Application Servers >
Distributed Application & Web Servers > WebSphere Application
Server > General
Operating system(s):
Software version: 400
Software edition:
Reference #: PQ67566
IBM Group: Software Group
Modified date: Nov 11, 2002
(C) Copyright IBM Corporation 2000, 2006. All Rights Reserved.