【架构师训练营】week 7 homework

public class CocurrentUtil {
    /**
     * @param concurrentNums 并发数
     * @param reqNums 请求次数
     * @param url 请求链接
     */
    public static void doRequest(long concurrentNums, int reqNums,String url) throws Exception{
        ExecutorService executor = Executors.newFixedThreadPool((int) concurrentNums);
        List<Long> timeList = new ArrayList<>();
        long startTimeMillis = System.currentTimeMillis();
        CountDownLatch latch = new CountDownLatch(reqNums);
        HttpUtil.get(url);
        for(int i = 0; i < reqNums; i++) {
            executor.execute(() ->{
                long start = System.currentTimeMillis();
                HttpUtil.get(url);
                latch.countDown();
                timeList.add(System.currentTimeMillis()-start);
            });
        }
        latch.await();
        executor.shutdown();
        Collections.sort(timeList);
        long totalCostTimeMillis = System.currentTimeMillis() - startTimeMillis;
        System.out.println("concurrent threads: " + concurrentNums + ", times: "
                + reqNums);
        System.out.println("total cost time(ms): " + totalCostTimeMillis
                + ",avg time(ms): " + ((double) totalCostTimeMillis / reqNums)
                + ",95 percent time(ms):" + timeList.get(95*reqNums/100));
    }
}

public static void main(String[] args) {
    try {
        CocurrentUtil.doRequest(10,100,"https://www.baidu.com");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

concurrent threads: 10, times: 100
total cost time(ms): 3821,avg time(ms): 38.21,95 percent time(ms):205

> ab -n 100 -c 10 https://www.baidu.com/

Server Software:        BWS/1.1
Server Hostname:        www.baidu.com
Server Port:            443
SSL/TLS Protocol:       TLSv1.2,ECDHE-RSA-AES128-GCM-SHA256,2048,128

Document Path:          /
Document Length:        227 bytes

Concurrency Level:      10
Time taken for tests:   1.219 seconds
Complete requests:      100
Failed requests:        0
Total transferred:      108195 bytes
HTML transferred:       22700 bytes
Requests per second:    82.03 [#/sec] (mean)
Time per request:       121.904 [ms] (mean)
Time per request:       12.190 [ms] (mean, across all concurrent requests)
Transfer rate:          86.67 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:       40   95  43.9     84     250
Processing:     9   22  16.7     17     100
Waiting:        8   22  16.7     17      99
Total:         53  117  48.2    101     267

Percentage of the requests served within a certain time (ms)
  50%    101
  66%    131
  75%    147
  80%    162
  90%    198
  95%    216
  98%    238
  99%    267
 100%    267 (longest request)