PQ92267: INCREASED CPU USAGE MIGRATING FROM V4 TO V5 WITH WEBSPHERE APPLICATION SERVER FOR Z/OS V5 | |||||||||||||||||||||||||||||||||||||||||||
![]() |
|||||||||||||||||||||||||||||||||||||||||||
![]() APAR status Closed as program error. Error description Customers may experience an increase in CPU utilization in WebSphere Application Server for z/OS v5. This increase may be caused by automatic reload. Reload is set in in the ibm-web-ext.xmi file. WebSphere Studio Applicaton Developer v5 enables reload in this file by default.Local fix There are two methods of providing relief for this problem: First, at the admin console, click on Applications - Enterprise Applications, and for each application installed, check the 'Reload Enabled' checkbox, and set the 'Reload Enabled' value to 0, and save/sync the changes. Alternatively, manually edit the ibm-web-ext.xmi file and set reloadInterval="0" and reloadingEnabled="true"Problem summary **************************************************************** * USERS AFFECTED: All users of WebSphere Application Server * * V5.0 for z/OS * **************************************************************** * PROBLEM DESCRIPTION: Excessive CPU utilization during Server * * idle time. * **************************************************************** * RECOMMENDATION: * **************************************************************** WebSphere Application Server for z/OS has excessive CPU utilization during server idle time when customer migrated from version 4.0 to 5.0. In version 4.0 application class reload was disabled so the class reload settings in the application were ignored. In version 5.0 application class reload was enabled and because the default settings for Web Applications is set to enabled, server class reload started to check for changed classes in the installed Web Application on the server. The default interval for the changed class check in Web Applications is 3 seconds.Problem conclusion WebSphere class loading function was updated to use WebSphere Alarms instead of Java Timers. Doing this will allow class reload to be switched to a mode in which it will only run at the end of request processing in the server. So, if there are not any requests being processed by the server then the class reload function will not be running. To enable this function requires Alarm Manager quiet mode be activated. Documentation for setting Alarm Manager to quiet mode can be found in the WebSphere Information Center by searching for 'Alarm Manager to quiet mode' or com.ibm.ejs.am.mode.workbased APAR PQ92267 is associated with SERVICE LEVEL W502016 of WebSphere Application Server V5.0 for z/OS.Temporary fix Comments
APAR is sysrouted FROM one or more of the following: APAR is sysrouted TO one or more of the following: PQ93423 Modules/Macros
Publications Referenced
|
Document Information |
Current web document: swg1PQ92267.html
Product categories: Software > Application Servers >
Distributed Application & Web Servers > WebSphere Application
Server for z/OS
Operating system(s):
Software version: 500
Software edition:
Reference #: PQ92267
IBM Group: Software Group
Modified date: Nov 1, 2004
(C) Copyright IBM Corporation 2000, 2009. All Rights Reserved.