IZ69167: JAVA JIT - HIGH CPU IN TR_IPROFILER::SEARCHFORSAMPLE()
Closed as program error.
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.
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.
When the JIT is unable to compile new methods because the maximum allowable memory has already been consumed, all uncompiled methods will execute in the interpreter causing an increase in the overhead due to interpreter profiling.
This defect will be fixed in: 6.0.0 SR8 5.0.0 SR12 . The JIT has been modified so that interpreter profiling will be discontinued when JIT memory is low and new methods are unlikely to be compiled. . To obtain the fix: Install build 20100210 or later
Reported component name
JAVA 5 JIT
Reported component ID
Last modified date
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fixed component name
JAVA 5 JIT
Fixed component ID
Applicable component levels