PQ65717: PERFORMANCE DEGRADATION BEING CAUSED BECAUSE OF DELAY IN GARBAGECOLLECTION OF SESSION OBJECTS.

A fix is available
WebSphere Application Server Version 3.5 Fix Pack 7 (3.5.7)

APAR

APAR status
Closed with unknown close code.

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 GC Finalizer
Local 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 information
APAR numberPQ65717
Reported component nameWEBSPHERE AE SO
Reported component ID5648C8402
Reported release350
StatusCLOSED
PENoPE
HIPERNoHIPER
Submitted date2003-03-03
Closed date2003-03-03
Last modified date2003-03-26

APAR is sysrouted FROM one or more of the following:
PQ67566

APAR is sysrouted TO one or more of the following:APAR is sysrouted FROM one or more of the following:PQ67566


Modules/Macros
SESSIONS
APAR is sysrouted TO one or more of the following:Modules/Macros

Fix information
Fixed component nameWEBSPHERE AE SO
Fixed component ID5648C8402

Applicable component levels
R400 PSYUP











Document Information

Product categories: Software, Application Servers, Distributed Application & Web Servers, WebSphere Application Server, General
Software version: 350
Reference #: PQ65717
IBM Group: Software Group
Modified date: 2003-03-26