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Author of Groovy modules: GBench, GProf, Co-author of a Java book パーフェクトJava, Game Developer at GREE

Friday, July 6, 2012

GBench 0.3.1 released!

Today I released GBench 0.3.1 with one bug fix for Groovy 2.0.

Release note: http://code.google.com/p/gbench/wiki/ReleaseNotes031.

Here is an example that compares execution time with and without @CompileStatic (new feature of Groovy 2.0) using GBench:
import gbench.BenchmarkBuilder 
import groovy.transform.CompileStatic 
int fib(int n) { 
    if (n < 2) return n 
    return fib(n - 1) + fib(n - 2)  
int fib2(int n) { 
    if (n < 2) return n 
    return fib2(n - 1) + fib2(n - 2)  
new BenchmarkBuilder().run { 
    int n = 20  
    "Normal Version" { fib n } 
    "@CompileStatic Version" { fib2 n } 
The output of the example:
* Groovy: 2.0.0
* JVM: Java HotSpot(TM) 64-Bit Server VM (23.0-b21, Oracle Corporation)
    * JRE: 1.7.0_04
    * Total Memory: 98.25 MB
    * Maximum Memory: 1157.375 MB
* OS: Mac OS X (10.7.4, x86_64) 

* Warm Up: Auto 
* CPU Time Measurement: On

                         user  system    cpu   real

Normal Version          89945      14  89959  89961
@CompileStatic Version  39219       4  39223  39222


  1. Hi Nagai, we use GBench in us project, and we are looking it very useful.
    Thanks. Tom

  2. Hi,
    Combining your two posts together and trying to run this gbench example with -indy is giving me an error. Have you successfully done this? (Sorry at work at the moment so I can't give the exact error but it is from the jvm saying the class file is an incorrect version and a digit 15 in there somewhere...)

    1. hi, sorry for late reply.
      i tried to run gbench 0.3.1 with groovy 2.0.0 indy but any error didn't occur.
      if you still have have the error, let me know more info.
      thanks :)