PQ67566: PERFORMANCE DEGRADATION BEING CAUSED BECAUSE OF DELAY IN GARBAGECOLLECTION OF SESSION OBJECTS.

 Fixes are available

PQ67566, 4.0.2, 4.0.3, 4.0.4: GarbageCollection causes performance degradation
PQ67566, 4.0.2, 4.0.3, 4.0.4: GarbageCollection causes performance degradation



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 GC
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 number PQ67566
Reported component name WEBSPHERE AE SO
Reported component ID 5630A2202
Reported release 400
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Submitted date 2002-10-24
Closed date 2002-11-07
Last modified date 2002-11-11

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:
PQ65717

Modules/Macros
SESSIONS          

SRLS

Fix information
Fixed component name WEBSPHERE AE SO
Fixed component ID 5630A2202

Applicable component levels
R400 PSY    UP


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