JUnitBenchmark

如果你希望用 JUnit 来测试一些性能问题，那么 JUnitBenchmark 可以帮到你，主要特性：

• 记录执行时间
• 监控垃圾收集
• 测试热身

• 示例测试：

  view source print ?

  01	package org.javabenchmark;

  02

  03	import com.carrotsearch.junitbenchmarks.AbstractBenchmark;

  04	import com.carrotsearch.junitbenchmarks.BenchmarkOptions;

  05	import javolution.text.TextBuilder;

  06	import org.junit.Test;

  07

  08

  /**

  09	* Benchmark for String concatenation. Compares StringBUilder (JDK) and

  10	* TextBuilder (Javolution).

  11

  */

  12	public class StringConcatenationBenchmark extends AbstractBenchmark {

  13

  14	public static final long LOOPS_COUNT = 10000000;

  15

  16

  @Test

  17	@BenchmarkOptions(benchmarkRounds = 3, warmupRounds = 1)

  18	public void stringBuilderBenchmark()  {

  19

  20	StringBuilder builder = new StringBuilder();

  21	for (long i = 0; i < LOOPS_COUNT; i++) {

  22	builder.append('i').append(i);

  23

  }

  24	System.out.println(builder.toString().length());

  25

  }

  26

  27

  @Test

  28	@BenchmarkOptions(benchmarkRounds = 3, warmupRounds = 1)

  29	public void textBuilderBenchmark()  {

  30

  31	TextBuilder builder = new TextBuilder();

  32	for (long i = 0; i < LOOPS_COUNT; i++) {

  33	builder.append('i').append(i);

  34

  }

  35	System.out.println(builder.toString().length());

  36

  }

  37

  }