The inline solution to Java programs with performance problems.
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README.md

Jrofiler

The inline solution to Java programs with performance problems.

Compilation

We use Maven to handle our dependencies.

Usage

Usage of Jrofiler is very simple, and resembles that of Python's profile module.

The following code demonstrates the usage of Jrofiler.

import tk.ivybits.profiler.Profiler;

public class Main {
   public static void main(String[] args) throws Exception {
       Profiler.start();
       doWait();
       Profiler.stop();
   }

   public static void doWait() throws InterruptedException {
       Thread.sleep(1000);
   }
}

The output from the above snippet, on the call of Profiler.stop, will print something like the following to stdout:

Method                                  Time (μs)           Calls          Time (μs) / Call
-------------------------------------------------------------------------------------------
Main.doWait                             1000047             1              1000047.00
HotSpotVirtualMachine.readInt           200                 2              100.00
PipedInputStream.read                   105                 4              26.25
PipedInputStream.close                  47                  1              47.00
WindowsVirtualMachine.detach            31                  1              31.00
PipedInputStream.<init>                 21                  1              21.00

You can also specify the OutputStream to write the result to be passing an instance of the latter as an argument to Profiler.stop.

A very important thing to note is that due to the nature of the Java transformation API Jrofiler only profiles classes loaded before the Profiler.start call. Furthermore, only classes loaded by the system ClassLoader can be profiled. Most standard library classes do not fulfill this requirement.