JAVA并发,同步锁性能测试
测试主要从运行时间差来体现,数据量越大,时间差越明显,例子如下:
1 package com.xt.thinks21_2; 2 3 /** 4 * 同步锁性能测试 5 * 6 * @author Administrator 7 * 8 */ 9 public class SynchronizedTimeTest { 10 public volatile int inc = 0; 11 12 public void increase() { 13 inc++; 14 } 15 16 public static void main(String[] args) { 17 final SynchronizedTimeTest test = new SynchronizedTimeTest(); 18 for (int i = 0; i < 10; i++) { 19 new Thread() { 20 public void run() { 21 for (int j = 0; j < 10000; j++) 22 test.increase(); 23 }; 24 }.start(); 25 } 26 Long time1 = System.currentTimeMillis(); 27 while (Thread.activeCount() > 1) { 28 // 保证前面的线程都执行完 29 Thread.yield(); 30 } 31 Long time2 = System.currentTimeMillis(); 32 System.out.println("time1:" + time1 + " time2:" + time2); 33 Long timeDiff = time2 - time1; 34 System.out.println("time:" + timeDiff + "-->" + test.inc); 35 } 36 }
上面是方法未加synchronized运行结果:
time1:1429805281187 time2:1429805281187
time:0-->75809
方法添加synchronized运行结果:
time1:1429805416628 time2:1429805416645
time:17-->100000
郑重声明:本站内容如果来自互联网及其他传播媒体,其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享,并不代表本站赞同其观点和对其真实性负责,也不构成任何其他建议。