春季啓動負載測試：一些請求卡住

我負載測試與嵌入式碼頭/ tomcat春季啓動應用程序，我得到了奇怪的行爲。我使用apache ab進行測試春季啓動負載測試：一些請求卡住

ab -n 100000 -c 1000 http://127.0.0.1:8080/ping 

Server Software:   
Server Hostname:  127.0.0.1 
Server Port:   8080 

Document Path:   /ping 
Document Length:  2 bytes 

Concurrency Level:  1000 
Time taken for tests: 5.253 seconds 
Complete requests:  100000 
Failed requests:  0 
Total transferred:  17000000 bytes 
HTML transferred:  200000 bytes 
Requests per second: 19038.05 [#/sec] (mean) 
Time per request:  52.526 [ms] (mean) 
Time per request:  0.053 [ms] (mean, across all concurrent requests) 
Transfer rate:   3160.61 [Kbytes/sec] received 

Connection Times (ms) 
       min mean[+/-sd] median max 
Connect:  0 37 222.1  0 3006 
Processing:  0 7 21.9  3  855 
Waiting:  0 7 21.7  3  853 
Total:   0 44 228.0  4 3052 

Percentage of the requests served within a certain time (ms) 
    50%  4 
    66%  7 
    75%  9 
    80%  11 
    90%  22 
    95%  39 
    98% 1004 
    99% 1017 
100% 3052 (longest request)

所以有些請求卡在某處。
隨着碼頭我嘗試不同的值：

_maxThreads, _minThread

和Tomcat：

max-connections, max-threads, min-spare-threads

在探查我找到了下：

org.eclipse.jetty.util.thread.QueuedThreadPool$2.run()    16,215ms 
    org.eclipse.jetty.util.thread.QueuedThreadPool.access$800 
     org.eclipse.jetty.util.thread.QueuedThreadPool.iddleJobPoll 
      org.eclipse.jetty.util.BlockingArrayQueue.poll   13,915ms

謝謝！

來源

2016-10-27 Nick Shishov

我不確定我真的明白是什麼讓你覺得某些請求被卡住了？ – jchampemont

嗨。爲什麼98％是1秒？ 98％的requeseets是好的。但2％的時間很長。奇怪的東西。與-k（keepAlive）選項結果是更好的 –