GBench 是 Groovy 的壓力測試模塊，提供 @Benchmark / Benchmark AST Transformation 用于實際程序測試以及 BenchmarkBuilder 用于微測試。

你可以通過在 groovy 文件中增加下面一行代碼即可，想起請看 Installation

@Grab('com.googlecode.gbench:gbench:0.3.1-groovy-2.0') // v0.3.1 for Groovy 2.0

@Benchmark 實例:

import gbench.*

class Task {
    @Benchmark void run() {
        // task
    }
}
/ Output:
Task  void run()  user:847000 system:1777000 cpu:2624000 real:4918000/</pre> 
BenchmarkBuilder 實例:
import gbench.*

new BenchmarkBuilder().run {
    'StringBuilder' {
        def sb = new StringBuilder()

        sb.append('foo')
        sb.append('bar')
        sb.append('baz')
        sb.toString()
    }
    'StringBuffer' {
        def sb = new StringBuffer()

        sb.append('foo')
        sb.append('bar')
        sb.append('baz')
        sb.toString()
    }
}.prettyPrint()
/* Output:
Environment

Groovy: 2.0.0
JVM: Java HotSpot(TM) 64-Bit Server VM (23.0-b15, Oracle Corporation)

JRE: 1.7.0_04-ea
Total Memory: 99.4375 MB
Maximum Memory: 1169.8125 MB


OS: Mac OS X (10.7.3, amd64) 

Options

Warm Up: Auto 
CPU Time Measurement: On

         user  system  cpu  real


StringBuilder   236       0  236   237
StringBuffer    263       0  263   267
*/</pre> 

http://code.google.com/p/gbench/