PM51889: DECREASE CLUSTER STARTUP TIME.

8.0.0.3: WebSphere Application Server V8.0 Fix Pack 3
8.0.0.4: WebSphere Application Server V8.0 Fix Pack 4
8.0.0.5: WebSphere Application Server V8.0 Fix Pack 5
8.0.0.6: WebSphere Application Server V8.0 Fix Pack 6
8.0.0.7: WebSphere Application Server V8.0 Fix Pack 7
8.0.0.8: WebSphere Application Server V8.0 Fix Pack 8
8.0.0.9: WebSphere Application Server V8.0 Fix Pack 9
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15

APAR status

• Closed as program error.

Error description

• The time to start a cluster is longer than expected.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All IBM WebSphere Application Server V8.0   *
  *                  users of Base and Network Deployment        *
  *                  editions.                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION: Excessive JIT compilation increases     *
  *                      the start time of servers and           *
  *                      clusters.                               *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The Java JIT compiler provides a performance boost by
  compiling frequently used classes in such a way that future
  invocations of those classes perform better.  However, the
  initial compilation of these classes takes additional time.
  For classes that are used often throughout the life of the
  server, it is worth taking the initial time to compile them in
  order to obtain future performance benefits.
  During server startup, numerous classes are loaded that will
  rarely be invoked after startup is complete.  Compiling all of
  these classes is often unnecessary and can increase server
  start time.  The JIT compiler should be optimzied to avoid
  unnecessary compilations during server startup.
  

Problem conclusion

• WebSphere Application Server was modified to inform the JIT
  compiler of the beginning and end of server  startup.  The JIT
  compiler can use this information to make better decisions
  about which classes to compile, thereby improving the start
  time of servers and clusters.
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 8.0.0.3.  Please refer to the Recommended Updates
  page for delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

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

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R800 PSY

     UP