MultiThread/multithreading_init/src/main/java/jmh/JMHExample05.java

package jmh;

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;

@BenchmarkMode(Mode.AverageTime)
@Fork(1)
@Warmup(iterations = 5)
@Measurement(iterations = 10)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public class JMHExample05 {

    public static void main(String[] args) throws RunnerException {
        Options options = new OptionsBuilder()
                .include(JMHExample05.class.getSimpleName())
                .build();

        new Runner(options).run();
    }

    // 在线程组test，在线称中有三个线程不断对Test实例write方法进行调用
    @GroupThreads(3)
    @Group("test")
    @Benchmark
    public void testWrite(MyState state) {
        state.write();
    }

    // 在线程组test，在线程中有三个线程对testRead方法进行调用
    @GroupThreads(3)
    @Group("test")
    @Benchmark
    public void testRead(MyState state) {
        state.read();
    }

    @State(Scope.Benchmark)
    public static class MyState {
        public MyState() {
            System.out.println("create instance");
        }

        public void write() {
            System.out.println("write");
        }

        public void read() {
            System.out.println("read");
        }
    }
}