Java* Code Analysis

Intel® VTune™ Amplifier supports analysis of Java* applications with some limitations:

• System-wide profiling is not supported for managed code.

• Interpreted Java methods are not recognized. All interpreted methods are always shown as "Interpreter" function in the call tree

• When opening source code for a hotspot, the VTune Amplifier may attribute events or time statistics to an incorrect piece of the code. It happens due to Oracle* JDK Java VM specifics. Often the information is attributed to the first line of the hot method's source code.

• Consider events and time mapping to the source code lines as approximate.

• For the Basic Hotspots analysis type, the VTune Amplifier may display only a part of the call stack. To view the complete stack, use additional command line Oracle JDK Java VM options that change behavior of the Java VM:

  • On Linux* x86, use client Oracle JDK Java VM instead of the server Java VM: either explicitly specify -client, or simply do not specify -server Oracle JDK Java VM command line option.

  • On Linux x64, specify -XX:-UseLoopCounter command line option that switches off on-the-fly substitution of the interpreted method with the compiled version.