PQ59932: TRY/FINALLY BLOCKS FOR JSP CUSTOM TAGS ARE CAUSING PERFORMANCE PROBLEMS DURING GARBAGE COLLECTION USING SOLARIS JDK 1.3.0/1.3.1

 A fix is available

PQ59932, 4.0.1, 4.0.2: JSP custom tags causes slow performance



APAR status
Closed as program error.

Error description
The problem appears to be that the JVM classloader handles
nested blocks.
Factors that affect the bug are:
1)How deeply nested the blocks are.
2)The number of try/catch blocks.
3)The complexity of the try/catch blocks.
The memory usage is exponential.
Garbage collection also appears to be effected.
When the blocks were flattened out the GC times went away.
Local fix Problem summary
****************************************************************
* USERS AFFECTED: WebSphere Application Server developers      *
*                 using custom tags and jsp's.                 *
****************************************************************
* PROBLEM DESCRIPTION: Performance problem when jsp contains   *
*                      nested custom tags.                     *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Java Garbage Collection time increases exponentially with
each try/finally block on a page causing slow response
times.
Problem conclusion
Removed try/finally blocks for each custom tag to get
around JDK performance problem.
Temporary fix
//wasdoc0/apars/pq59932/4.0.2
Comments
APAR information
APAR number PQ59932
Reported component name WEBSPHERE AE SO
Reported component ID 5630A2202
Reported release 400
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Submitted date 2002-04-09
Closed date 2002-04-11
Last modified date 2002-04-11

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Modules/Macros
JSP          

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 #: PQ59932
IBM Group: Software Group
Modified date: Apr 11, 2002