PMI statistics are enabled by default for an Application Server and when enabled, a gradual degradation in performance might be observed.
PK64697 resolves the following problem:
On tests with Performance Monitoring Infrastructure (PMI) activated, there is a decrease in IBM® WebSphere® Portal throughput over time as measured by the Loadrunner controller. Without PMI, no such decrease is observed.
Turn off PMI stats.
IBM® WebSphere® Application Server Version 6.1 users with Performance Monitoring Infrastructure (PMI) statistics enabled.
PMI statistics are enabled by default for an Application Server and when enabled, a gradual degradation in performance might be observed. This can lead to a denial of service.
When PMI statistics are enabled, irrespective of whether individual statistics are enabled or disabled, sufficient memory can be consumed to cause a gradual degradation in performance over time.
Relevant individual PMI statistics have been modified to no longer consume memory when disabled and further have been moved from the "basic" set of PMI Statistics to the "all" set so that they are not enabled by default.
Note that if a "custom" PMI statistics set is in use the enablement/disablement of individual stats is unaffected by this APAR.
This APAR affects the granularity with which some PMI statistics can be enabled at runtime. To undo the effects of this APAR and return to the previous behavior, after applying this APAR please set the Webcontainer custom property com.ibm.ws.webcontainer.RuntimeURIStatEnablement to true.
The fix for this APAR is currently targeted for inclusion in Fix Pack 18.104.22.168.
Please refer to the Recommended Updates page for delivery information:
Please download the UpdateInstaller below to install this fix.
Please review the readme.txt for detailed installation instructions.
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|6.1.0-WS-WAS-IFPK64697||5/20/2008||US English||16842||FC FTP DD|
Contact IBM Support using SR (http://www-306.ibm.com/software/support/probsub.html), visit the WebSphere Application Server Support Web site (http://www.ibm.com/software/webservers/appserv/was/support/), or contact 1-800-IBM-SERV(U.S. only).
Problems (APARS) fixed