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  • 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:

      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 }
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  • 原文地址:https://www.cnblogs.com/shihao/p/2939116.html
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