PQ72579: PERFORMANCE DEGRATION AFTER UPGRADING FROM WAS 4.0.3 TO WAS WAS 4.0.5

 A fix is available

4.0.7: WebSphere Application Server Version 4.0 Fix Pack 7



APAR status
Closed as program error.

Error description
The problem occurs once the application is moved from 4.0.3 to
4.0.5.  Upon moving to 4.0.5, the response time and garbage
collection goes up - sometimes almost 200%.  In looking at
traces, it looks like 4.0.3 is using less of the ORB and in
4.0.5 it looks like more.  The user has
com.ibm.CORBA.iiop.noLocalCopies=true specified in both 4.0.3
and 4.0.5.
Local fix Problem summary
****************************************************************
* USERS AFFECTED: WebSphere Application Server Developers      *
*                 using the ORB.                               *
****************************************************************
* PROBLEM DESCRIPTION: com.ibm.CORBA.iiop.ClientDelegate       *
*                      .is_local() causes unnecessary          *
*                      lookups assuming the servant is         *
*                      disconnected.                           *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
com.ibm.CORBA.iiop.ClientDelegate.is_local() does a check to
see if a servant is disconnected. If so, it will perform a new
lookup. The check was too strict and causes unnecessary
lookups that are expansive.
Problem conclusion
Corrected the check in ClientDelegate.is_local(). The code no
longer requires the servant lookup when it is not needed.
Temporary fix Comments
APAR information
APAR number PQ72579
Reported component name WEBSPHERE AE AI
Reported component ID 5630A2200
Reported release 400
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Submitted date 2003-03-27
Closed date 2003-05-12
Last modified date 2003-05-12

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Modules/Macros
Orb          

SRLS

Fix information

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 #: PQ72579
IBM Group: Software Group
Modified date: May 12, 2003