Java 怎么通过openjdk jmh测试原子long

2019年7月29日19:52:03Java 怎么通过openjdk jmh测试原子long已关闭评论 441 1146字阅读3分49秒

1.简介

Java 怎么通过openjdk jmh测试原子long?——请看下文。

2.示例代码

/**
 * 版权所有 编程十万个怎么办(www.tah1986.com)
 */


import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;


public class TestAtomicLong {
    public static final int[] threadsCountArray = new int[] { 1, 2, 4, 8,
            16, 32, 48, 64 };

    @State(Scope.Benchmark)
    public static class AtomicLongWrapper {
        public AtomicLong value = new AtomicLong(0l);
    }

    @Benchmark
    @BenchmarkMode(Mode.SingleShotTime)
    @OutputTimeUnit(TimeUnit.MILLISECONDS)
    public Long incrementAtomicLoop(
            final AtomicLongWrapper atomicLongWrapper) {
        for (int i = 0; i < 1_000_000; i++) {
            atomicLongWrapper.value.incrementAndGet();
        }
        return atomicLongWrapper.value.get();
    }

    public static void main(String[] args) throws RunnerException {
        for (final int threadsCount : threadsCountArray) {
            Options opt = new OptionsBuilder()
                    .include(TestAtomicLong.class.getSimpleName())
                    .jvmArgs("-server", "-Xmx2G").warmupIterations(10)
                    .measurementIterations(25).forks(1)
                    .threads(threadsCount).build();
            new Runner(opt).run();
        }
    }
}

 
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