PK64697; 6.1.0.17: Decrease in throughput over time when PMI is activated

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Abstract

PMI statistics are enabled by default for an Application Server and when enabled, a gradual degradation in performance might be observed.

Download Description

PK64697 resolves the following problem:

ERROR DESCRIPTION:
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.

LOCAL FIX:

Turn off PMI stats.

PROBLEM SUMMARY

USERS AFFECTED:
IBM® WebSphere® Application Server Version 6.1 users with Performance Monitoring Infrastructure (PMI) statistics enabled.

PROBLEM DESCRIPTION:
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.


RECOMMENDATION:
None

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.

PROBLEM CONCLUSION:
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 6.1.0.19.

Please refer to the Recommended Updates page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Prerequisites

Please download the UpdateInstaller below to install this fix.

URL LANGUAGE SIZE(Bytes)
UpdateInstaller US English 7250000

Installation Instructions

Please review the readme.txt for detailed installation instructions.

URL LANGUAGE SIZE(Bytes)
Readme US English 5603

Download package


Download RELEASE DATE LANGUAGE SIZE(Bytes) Download Options
What is Fix Central (FC)?
What is DD?
6.1.0-WS-WAS-IFPK64697 5/20/2008 US English 16842 FC FTP DD

Technical support

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
PK64697

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Document information


More support for:

WebSphere Application Server
Servlet Engine/Web Container

Software version:

6.1, 6.1.0.1, 6.1.0.2, 6.1.0.3, 6.1.0.5, 6.1.0.7, 6.1.0.9, 6.1.0.11, 6.1.0.13, 6.1.0.15, 6.1.0.17

Operating system(s):

AIX, HP-UX, Linux, Solaris, Windows, i5/OS

Software edition:

Base, Express, Network Deployment

Reference #:

4019260

Modified date:

2008-06-11

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