PI11450: SLOW PERFORMANCE CAUSED BY ITCAM'S BYTE CODE INSTRUMENTATION PROCESSING DYNAMICALLY CREATED CLASSES DUE TO JAVASCRIPT

ITCAM for J2EE V7.1.1 Fixes
IBM Tivoli Composite Application Manager for Application Diagnostics V7.1 fixes

APAR status

• Closed as program error.

Error description

• ITCAM's byte code instrumentation is slowing the threads due to
  a very large number of dynamically created classes due to
  javascript (classes like org/mozilla/javascript/gen/c61260).
  Threads are dynamically generating such classes and waiting for
  inspection by ITCAM whether they need to be monitored.
  

Local fix

• These are the configuration steps to exclude the dynamically
  generated javascript classes from being monitored:
  
  1. Create a new file in <DC_HOME>/runtime/custom called
     excludes.xml.  For example:
  
     ITM/aix533/yn/wasdc/7.1.0.3.7/runtime/custom/excludes.xml
  
  2. Add the following XML content to the above file:
  
     <?xml version="1.0"?>
     <gpe>
       <bci>
         <classExcludes>
           <exclude>org.mozilla.javascript.gen.*</exclude>
         </classExcludes>
        </bci>
     </gpe>
  
  2. In the same directory, edit the
     toolkit_global_custom.properties file and add the following
     property to the end of the file:
  
     am.camtoolkit.gpe.customxml.classes.exclude=/ITM/aix533/yn/
     wasdc/7.1.0.3.7/runtime/custom/excludes.xml
  
     (Note the full absolute path to the file created in step 1
     should be provided for this property value).
  
     In this example, this exclusion will apply to all the data
     collectors that are configured  uner 7.1.0.3.7/runtime
     directory.
  
  3. Restart the WebSphere application server instance(s) and
     verify that the thread slowdown no longer happens.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  
  Applications monitored by ITCAM that use dynamically generated
  classes by javascript at runtime.
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  
  If there a large number of dynamically generated classes by
  javascript, the performance of the server becomes slow as ITCAM
  analyzes them and injects byte code into each one of them.  A
  few classes should not cause the problem but typically
  javascript generates a large number.
  
  ****************************************************************
  

Problem conclusion

• This APAR fix excludes org.mozilla.javascript.gen.* package
  classes from byte code injection.  This means that the
  monitoring of these classes will not be available, by default.
  
  The fix for this APAR is contained in the following maintenance
  releases:
  
    | Interim Fix | 7.1.0.3-TIV-ITCAMAD-IF0009
    | Interim Fix | 7.1.1-TIV-ITCAM_J2EE-IF0001
    | Interim Fix | 7.2.0.0-TIV-ITCAM_DC-IF0011
    | Interim Fix | 7.2.0.0-TIV-ITCAMAD_WS-IF0006
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  TCAM AD WAS DC

• Fixed component ID

  5724Y92DC

Applicable component levels

• R710 PSY

     UP

• R720 PSY

     UP