LongAdder与AtomicInteger并发性能的简单比较测试

测试代码如下：

package lhever.JVM;import java.util.concurrent.CountDownLatch;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.atomic.AtomicLong;import java.util.concurrent.atomic.LongAdder;public class AtomicTest{    public  static final  int MAX_THREAD_COUNT = 10;    private static final int TASK_COUNT = 10;    private static final int TARGET_COUNT = 100000000;    private AtomicLong atomicLongVal = new AtomicLong(0);    private LongAdder longAdderVal = new LongAdder();    private static CountDownLatch latchForAtomicLong = new CountDownLatch(TASK_COUNT);    private static CountDownLatch latchForLongAdder = new CountDownLatch(TASK_COUNT);    public class AtomicLongThread implements Runnable {        protected String name;        protected long startTime;        public AtomicLongThread(long startTime) {         this.startTime = startTime;        }        @Override        public void run()        {            long v = atomicLongVal.get();            while(v < TARGET_COUNT) {                v = atomicLongVal.incrementAndGet();            }            long endTime = System.currentTimeMillis();            System.out.println("AtomicLongThread Spend:" + (endTime - startTime) + "ms, v = " + v);            latchForAtomicLong.countDown();        }    }    public class LongAddderThread implements Runnable {        protected String name;        protected long startTime;        public LongAddderThread(long startTime) {         this.startTime = startTime;        }        @Override        public void run()        {            long v = longAdderVal.sum();            while(v < TARGET_COUNT) {                longAdderVal.increment();                v = longAdderVal.sum();            }            long endTime = System.currentTimeMillis();            System.out.println("LongAddderThread Spend:" + (endTime - startTime) + "ms, v = " + v);            latchForLongAdder.countDown();        }    }    public void testAtomicLongThread() throws InterruptedException {        ExecutorService exe = Executors.newFixedThreadPool(MAX_THREAD_COUNT);        long startTime = System.currentTimeMillis();        AtomicLongThread atomicIntegerThread = new AtomicLongThread(startTime);        for(int i = 0; i < TASK_COUNT; i++) {            exe.submit(atomicIntegerThread);        }        latchForAtomicLong.await();        exe.shutdown();    }    public void testLongAdderThread() throws InterruptedException {        ExecutorService exe = Executors.newFixedThreadPool(MAX_THREAD_COUNT);        long startTime = System.currentTimeMillis();        LongAddderThread longAddderThread = new LongAddderThread(startTime);        for(int i = 0; i < TASK_COUNT; i++) {            exe.submit(longAddderThread);        }        latchForLongAdder.await();        exe.shutdown();    }    /**     * 下面的测试表明，AtomicLong的并发性能比LongAdder要差，在线程竞争越剧烈的场合，其表现出来的性能会更加优越     * @param args     * @throws InterruptedException     * @author lhever 2017年4月4日 下午11:10:06     * @since v1.0     */    public static void main(String[] args) throws InterruptedException {       /**        * MAX_THREAD_COUNT、TASK_COUNT的值都为3时候测试结果如下：        */        AtomicTest test = new AtomicTest();        test.testAtomicLongThread();        test.testLongAdderThread();        /*        在本人的win7 64位系统 运行结果如下        AtomicLongThread Spend:2258ms, v = 100000001        AtomicLongThread Spend:2258ms, v = 100000002        AtomicLongThread Spend:2258ms, v = 100000000        LongAddderThread Spend:2155ms, v = 100000000        LongAddderThread Spend:2155ms, v = 100000000        LongAddderThread Spend:2155ms, v = 100000000        */        /**         * MAX_THREAD_COUNT、TASK_COUNT的值都为10时候测试结果如下：         */        AtomicTest test1 = new AtomicTest();        test1.testAtomicLongThread();        test1.testLongAdderThread();       /*                     在本人的win7 64位系统 运行结果如下        AtomicLongThread Spend:2889ms, v = 100000005        AtomicLongThread Spend:2890ms, v = 100000002        AtomicLongThread Spend:2890ms, v = 100000006        AtomicLongThread Spend:2889ms, v = 100000003        AtomicLongThread Spend:2889ms, v = 100000004        AtomicLongThread Spend:2890ms, v = 100000007        AtomicLongThread Spend:2889ms, v = 100000000        AtomicLongThread Spend:2889ms, v = 100000001        AtomicLongThread Spend:2891ms, v = 100000008        AtomicLongThread Spend:2892ms, v = 100000009        LongAddderThread Spend:2054ms, v = 100000005        LongAddderThread Spend:2054ms, v = 100000003        LongAddderThread Spend:2054ms, v = 100000003        LongAddderThread Spend:2054ms, v = 100000007        LongAddderThread Spend:2054ms, v = 100000002        LongAddderThread Spend:2054ms, v = 100000006        LongAddderThread Spend:2054ms, v = 100000007        LongAddderThread Spend:2054ms, v = 100000004        LongAddderThread Spend:2054ms, v = 100000003        LongAddderThread Spend:2057ms, v = 100000008        */    }}