GBench - easy code benchmarking

//source: http://nagaimasato.blogspot.jp/2012/07/gbench-031-released.html
//requires Groovy 2.0.0+

@Grab('com.googlecode.gbench:gbench:0.3.1-groovy-2.0') 
import gbench.BenchmarkBuilder
import groovy.transform.CompileStatic
 
int fib(int n) {
    if (n < 2) return n 
    return fib(n - 1) + fib(n - 2)  
} 
 
@CompileStatic 
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 } 
}.prettyPrint()