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LOP - Low Overhead Profiler for Java

LOP is a very simplistic profiler for Java that uses bytecode instrumentation via Javassist.

Usage

  1. Create a file profiler.properties in the root directory of your Java program.
  2. In this file, add a set of lines following the scheme <class-name>=<method-name-1>,<method-name-2>..., for example org.deidentifier.arx.example.Example=test1,test2, telling LOP to profile the according methods of the given class. LOP will automatically handle aspects such as class hierarchies, method overloading etc for you.
  3. Add the following parameter when launching the JVM: -javaagent:lop-1.0.0.jar.
  4. For JDK 7 and newer, also add: -XX:-UseSplitVerifier.

This will result in output such as (see org.deidentifier.arx.example.Example):

     Total time [ms] |     Invocation count | Method 
----------------------------------------------------
                   0 |                    0 | org.deidentifier.arx.example.Example.test1() 
                   0 |                    0 | org.deidentifier.arx.example.Example.test1(int) 
                   0 |                    0 | org.deidentifier.arx.example.Example.test1(int,String) 
                  42 |                 2000 | org.deidentifier.arx.example.Example.test2()

Download

A binary version (JAR file) is available for download here.