IZ92808: JAVA 6 JIT COMPILER LOOPS WITH HIGH CPU USAGE

APAR status

• Closed as program error.

Error description

• Error Message: The Java 6 JIT compiler loops with high CPU usage
  for a very long time while compiling a method. The compilation
  eventually finishes (after an hour or more) and execution of the
  Java program continues normally. The method may contain a very
  large compound arithmetic expression.
  .
  Stack Trace: TR_SinkStores::treeIsSinkableStore
  .
  

Local fix

• This issue can be worked around using the
  -Xjit:disableStoreSinking option.
  

Problem summary

• The problem is caused when a complex expression tree causes a
  recursive algorithm in the JIT compiler to consume an excessive
  amount of CPU time.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR10
  .
  The JIT compiler algorithm has been updated to prevent the deep
  recursion.
  .
  To obtain the fix:
  Install build 20110123 or later
  

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

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R600 PSN

     UP