IV72274: FAILED COMPILATION DUE TO EXCESSIVE COMPLEXITY

APAR status

• Closed as program error.

Error description

• Error Message: Some applications showed a 15-33% regression
  compared with earlier Java releases. Verbose log shows
  compilationExcessiveComplexity failure on some of the hottest
  methods.
  .
  Stack Trace: N/A
  .
  This regression is seen on all platform (x,p,z).
  

Local fix

• The issue can be worked around using the
  -Xjit:disableLoopVersioner option.
  

Problem summary

• The problem is caused when optimizer reaches number of loops
  limit. If the limit is reached, JIT will abort the current
  compilation and try to recompile the method at a lower
  optimization level.
  

Problem conclusion

• Number of loops limit has been increased for veryhot/scorching
  methods to prevent this issue.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR1 (8.0.1.0)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
   https://www.ibm.com/developerworks/java/jdk/
  

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:

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R130 PSY

     UP