Java Microbenchmark Harness --如何获得基准测试的持续时间？

Question

如果我有

@Benchmark
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public void foo() {
    for (int i = 0; i < 1000; i++) {
        System.out.println(i);
    }
}

它在300微秒内运行。

问:有没有办法获得价值为300的int/long？

Answer 1

您可以编程运行基准测试并访问其结果：

public class BenchmarkRunner {

  public static void main(String[] args) throws Exception {
    Options opt = new OptionsBuilder()
            .include(YourBenchmark.class.getSimpleName())
            .warmupIterations(10)
            .warmupTime(TimeValue.seconds(1))
            .measurementIterations(10)
            .measurementTime(TimeValue.seconds(2))
            .forks(5)
            .shouldFailOnError(true)
            .build();

    Collection<RunResult> runResults = new Runner(opt).run();
    runResults.forEach(runResult -> {
      Result primaryResult = runResult.getPrimaryResult();
      double score = primaryResult.getScore(); // <-- here's the score of your benchmark
    });
  }
}