Package org.apache.jackrabbit.oak.commons

Class Profiler

  • All Implemented Interfaces:
    Runnable
    public class Profiler
extends Object
implements Runnable
    A simple CPU profiling tool similar to java -Xrunhprof. It can be used in-process (to profile the current application) or as a standalone program (to profile a different process, or files containing full thread dumps).

    • Field Detail

      • interval

        public int interval

      • depth

        public int depth

      • paused

        public boolean paused

      • sumClasses

        public boolean sumClasses

      • sumMethods

        public boolean sumMethods

    • Constructor Detail

      • Profiler

        public Profiler()

    • Method Detail

      • premain

        public static void premain​(String agentArgs,
                           Instrumentation inst)
        This method is called when the agent is installed.
        Parameters:
        agentArgs - the agent arguments
        inst - the instrumentation object

      • getInstrumentation

        public static Instrumentation getInstrumentation()
        Get the instrumentation object if started as an agent.
        Returns:
        the instrumentation, or null

      • main

        public static void main​(String... args)
        Run the command line version of the profiler. The JDK (jps and jstack) need to be in the path.
        Parameters:
        args - the process id of the process - if not set the java processes are listed

      • startCollecting

        public Profiler startCollecting()
        Start collecting profiling data.
        Returns:
        this

      • stopCollecting

        public Profiler stopCollecting()
        Stop collecting.
        Returns:
        this

      • run

        public void run()
        Specified by:
        run in interface Runnable

      • getTop

        public String getTop​(int count)
        Get the top stack traces.
        Parameters:
        count - the maximum number of stack traces
        Returns:
        the stack traces.