Java多線程實現性能測試

1、創建多線程和線程池的代碼：

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

int threadSize = 100;  //開啓的線程數
//創建線程池
ExecutorService executorService = Executors.newFixedThreadPool(threadSize);
long start = System.currentTimeMillis();
//讓線程池中的每一個線程都開始工作
for (int j = 0; j < threadSize; j++) {
    //執行線程
    executorService.execute(new TestPerformance(threadSize));
}
//等線程全部執行完後關閉線程池
executorService.shutdown();
executorService.awaitTermination(Integer.MAX_VALUE, TimeUnit.DAYS);
long end = System.currentTimeMillis();
System.out.println("測試次數：" + TestPerformance.atomicInteger.get());
System.out.println("用時：" + (end - start));
System.out.println("速度：" + TestPerformance.atomicInteger.get() * 1000 / (end - start) + "次/秒");

2、具體要測試性能的代碼：

package com.test.performance;


import java.util.concurrent.atomic.AtomicInteger;

/**
 * 測試性能.
 */
public class TestPerformance implements Runnable {

    //每個線程的執行次數
    private int size;

    //記錄多線程的總執行次數，保證高併發下的原子性
    public static AtomicInteger atomicInteger = new AtomicInteger(0);

    public TestPerformance(int size) {
        this.size = size;
    }

    @Override
    public void run() {

        int count = 0;
        while (count < size) {
            count++;

            atomicInteger.getAndIncrement();

            ///////////////
	    //在此寫入需要測試性能的代碼塊
	    ///////////////

            System.out.println("線程ID與對應的執行次數：" + Thread.currentThread().getId() + "--->" + count);
        }
    }
}