Question

在Jason Brittain与Ian F.Darwin撰写的 Tomcat The Definitive Guide 一书中，当使用ab工具进行基准测试时，写作者说，

您应该通过运行至少100,000个HTTP请求进行基准测试。此外，您可以配置测试客户端以生成任意数量的客户端线程，但如果将其设置为高于在Tomcat的conf / server.xml文件中为您设置的maxThreads，则不会得到有用的结果。默认情况下，它设置为150。

然后写作者推荐149。

在我的情况下，使用 149 客户端线程，运行结果为：

[user@apachetomcat ~]$ ab -k -n 100000 -c 149 http://10.138.0.2:8080/test.html
This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking 10.138.0.2 (be patient)
Completed 10000 requests
Completed 20000 requests
Completed 30000 requests
Completed 40000 requests
Completed 50000 requests
Completed 60000 requests
Completed 70000 requests
Completed 80000 requests
Completed 90000 requests
Completed 100000 requests
Finished 100000 requests

Server Software:        
Server Hostname:        10.138.0.2
Server Port:            8080
Document Path:          /test.html
Document Length:        13 bytes
Concurrency Level:      149
Time taken for tests:   45.527 seconds
Complete requests:      100000
Failed requests:        0
Write errors:           0
Keep-Alive requests:    99106
Total transferred:      23195530 bytes
HTML transferred:       1300000 bytes
Requests per second:    2196.48 [#/sec] (mean)
Time per request:       67.836 [ms] (mean)
Time per request:       0.455 [ms] (mean, across all concurrent requests)
Transfer rate:          497.54 [Kbytes/sec] received
Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   6.8      0      70
Processing:    66   67   5.6     67     870
Waiting:       66   67   5.6     67     870
Total:         66   68   8.8     67     870
Percentage of the requests served within a certain time (ms)
  50%     67
  66%     67
  75%     67
  80%     67
  90%     67
  95%     68
  98%     69
  99%    133
 100%    870 (longest request)

增加到 1000 客户端线程后，结果为：

[user@apachetomcat ~]$ ab -k -n 100000 -c 1000 http://10.138.0.2:8080/test.html
This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking 10.138.0.2 (be patient)
Completed 10000 requests
Completed 20000 requests
Completed 30000 requests
Completed 40000 requests
Completed 50000 requests
Completed 60000 requests
Completed 70000 requests
Completed 80000 requests
Completed 90000 requests
Completed 100000 requests
Finished 100000 requests
Server Software:        
Server Hostname:        10.138.0.2
Server Port:            8080
Document Path:          /test.html
Document Length:        13 bytes
Concurrency Level:      1000
Time taken for tests:   7.205 seconds
Complete requests:      100000
Failed requests:        0
Write errors:           0
Keep-Alive requests:    99468
Total transferred:      23197340 bytes
HTML transferred:       1300000 bytes
Requests per second:    13879.80 [#/sec] (mean)
Time per request:       72.047 [ms] (mean)
Time per request:       0.072 [ms] (mean, across all concurrent requests)
Transfer rate:          3144.28 [Kbytes/sec] received
Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   8.1      0      68
Processing:    66   69  22.3     67    1141
Waiting:       66   69  22.3     67    1141
Total:         66   70  27.5     67    1141
Percentage of the requests served within a certain time (ms)
  50%     67
  66%     67
  75%     68
  80%     68
  90%     69
  95%     71
  98%     87
  99%    139
 100%   1141 (longest request)

每秒请求数从2196.48 /秒增加到13879.80 /秒，所以我认为这种变化很有意义。
当我们将它设置为高于maxThreads时，作者为什么认为它没有用呢？在我的情况下，每秒请求的增量意味着什么？我对每秒的请求感到困惑。在本书的后续章节中理解作者的基准非常重要。

使用ab进行基准测试时，我可以增加客户端线程数量而不是Tomcat的maxThreads吗？

0 个答案: