PM13002: JAVA JIT - HIGH CPU IN TR_IPROFILER::SEARCHFORSAMPLE()

APAR status

• Closed as duplicate of another APAR.

Error description

• Error Message: A TProf profile shows many TR_IProfiler related
  methods taking CPU in the JIT library.
  40202 26.17 java.exe_0834
    MOD  24421 15.90 C:\jre\bin\j9jit24.dll
     SYM 8520 5.55  TR_IProfiler::searchForSample
     SYM 2214 1.44  TR_IProfiler::bcHash
     SYM 2204 1.43  TR_IProfiler::addSampleData
     SYM 2175 1.42  parseBuffer
     SYM 1665 1.08  TR_IProfiler::findOrCreateEntry
  .
  Stack Trace: N/A
  .
  The "JIT Code Cache" segments (listed in javacore files) have
  consumed the maximum amount of memory allowed by the JVM
  resulting in the JIT refusing the compile any more methods
  forcing uncompiled methods to remain executing in the
  interpreter.
  

Local fix

• The problem can be avoided by using the following java command
  line option: -Xjit:disableInterpreterProfiling
  Note: This option will effect the quality of the code that the
  JIT generates and therefore may have a impact on performance,
  but in cases where this problem is occurring the performance
  loss will be more then made up for by avoiding the interpreter
  profiling overhead.
  

Problem summary

Problem conclusion

Temporary fix

Comments

• PM13002 was taken to deliver a ++APAR for IZ69136. PM13002 is
  being closed DUP of PM12251 because PM12251 will document the
  delivery of SDK 1.6 SR8, which will contain the fix for IZ69136.
  

APAR Information

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

  IZ69136

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

Fix information

Applicable component levels