PQ58984: SIGNIFICANT PERFORMANCE DEGRADATION IS NOTED WHEN SMF EVENT AND ACTIVITY RECORDING IS ENABLED FOR WEBSPHERE | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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![]() APAR status Closed as program error. Error description Problem Without any activity or interval SMF records being written by th server or container, the application ran at approximately 400 transactions/second with a .04 second response time as observed the (Mercury LoadRunner) client. SMF Interval Records: With SMF server & container interval records being written at an interval of five minutes, the same appl. ran at approximately 130 transactions/second with a .16 second response time.Local fix Do not enable SMF recording for the WAS container.Problem summary **************************************************************** * USERS AFFECTED: All users of WebSphere Application Server * * V4.0.1 for z/OS and OS/390 * **************************************************************** * PROBLEM DESCRIPTION: Turning SMF recording on causes * * performance to deteriorate * * significantly. * **************************************************************** * RECOMMENDATION: * **************************************************************** Tuning SMF recording on causes performance to deteriorate significantly. Improvement modifications in SMF Recording are needed.Problem conclusion Performance during SMF recording has been improved by doing the following: 1. SMF recording support has been modified such that unguarded calls to Trace methods are no longer done. Testing is now done to determine if Tracing is enabled before calling the method. 2. The many calls to tputv have been removed. 3. The implementation of ws390uuid.class created a large number of Java String Objects. ws390wsuuid has been restructured to make one return String on the toString method. In addition, the create of the hashcode is not done until it is called for. APAR PQ58984 is associated with SERVICE LEVEL W401060 of WebSphere Application Server V4.0.1 for z/OS and OS/390.Temporary fix Comments
APAR is sysrouted FROM one or more of the following: APAR is sysrouted TO one or more of the following: UQ66083 Modules/Macros
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Document Information |
Product categories: Software > Application Servers >
Distributed Application & Web Servers > WebSphere Application
Server for z/OS
Operating system(s):
Software version: 401
Software edition:
Reference #: PQ58984
IBM Group: Software Group
Modified date: Jun 5, 2002
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