IV55848: POSSIBLE PERFORMANCE DROP WHEN MULTIPLE JVMS ATTEMPT TO LOAD AND STORE THE SAME CLASS WHEN RUNNING WITH -XSHARECLASSES

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: N/A
  .
  

Local fix

Problem summary

• Problem is caused when multiple JVMs connected to same shared
  class cache attempt to load same class simultaneously, the class
  is not contained in the shared cache and is loaded from disk and
  then stored into the shared cache. This issue potentially
  neutralizes the JVM's capability to optimize scenarios where
  multiple JVMs are trying to load and store the same class.
  

Problem conclusion

• This APAR will be fixed in the following Java Releases:
     7 R1 SR1       (7.1.1.0)
     7    SR7       (7.0.7.0)
     6 R1 SR8       (6.1.8.0)
  .
  The JVM has been updated to fix the issue.
  

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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R270 PSY

     UP

• R260 PSY

     UP