在本章中，我们将使用重要标志描述 -n 和 -c 的各种组合，以逐渐增加网络服务器的负载.
您应该主要关注以下指标在增加负载和减去时如何变化;
每秒请求数
连接时间(毫秒)
在特定时间(ms)内提供的请求百分比
当服务器开始卡住并且你开始收到失败的请求时，你也应该注意到阈值.
让我们按单个用户执行100次连续页面加载 :
$ ab -l -r -n 100 -c 1 -k -H"Accept-Encoding:gzip，deflate"http://127.0.0.1:8000/
This is ApacheBench, Version 2.3 <$Revision: 1604373 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, https://img01.yuandaxia.cn/Content/img/tutorials/apache_bench/yuebofa.php Licensed to The Apache Software Foundation, https://img01.yuandaxia.cn/Content/img/tutorials/apache_bench/ Benchmarking 127.0.0.1 (be patient).....done Server Software: Rocket Server Hostname: 127.0.0.1 Server Port: 8000 Document Path: / Document Length: Variable Concurrency Level: 1 Time taken for tests: 0.045 seconds Complete requests: 100 Failed requests: 0 Non-2xx responses: 100 Keep-Alive requests: 0 Total transferred: 27700 bytes HTML transferred: 6600 bytes Requests per second: 2206.24 [#/sec] (mean) Time per request: 0.453 [ms] (mean) Time per request: 0.453 [ms] (mean, across all concurrent requests) Transfer rate: 596.80 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 0 0.0 0 0 Processing: 0 0 0.0 0 0 Waiting: 0 0 0.0 0 0 Total: 0 0 0.0 0 1 Percentage of the requests served within a certain time (ms) 50% 0 66% 0 75% 0 80% 0 90% 1 95% 1 98% 1 99% 1 100% 1 (longest request)
此案例对应于网站上的峰值负载，每月点击次数超过50,000次.
$ ab -l -r -n 10 -c 5 -k -H"Accept-Encoding:gzip，deflate"http://127.0.0.1 :8000/
在以下后续输出中，为清晰起见，我们将省略公共标题.
... Requests per second: 2009.24 [#/sec] (mean) Time per request: 2.488 [ms] (mean) Time per request: 0.498 [ms] (mean, across all concurrent requests) Transfer rate: 543.52 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 1 0.5 1 2 Processing: 0 1 0.5 1 2 Waiting: 0 1 0.5 1 1 Total: 2 2 0.4 3 3 ERROR: The median and mean for the total time are more than twice the standard deviation apart. These results are NOT reliable. Percentage of the requests served within a certain time (ms) 50% 3 66% 3 75% 3 80% 3 90% 3 95% 3 98% 3 99% 3 100% 3 (longest request)
此测试对应10个不同并发用户的100页加载，每个用户正在执行10个连续页面加载.
$ ab -r -n 10 -c 10 -k -H"Accept-Encoding:gzip，deflate"http://127.0.0.1:8000/
... Requests per second: 2225.68 [#/sec] (mean) Time per request: 4.493 [ms] (mean) Time per request: 0.449 [ms] (mean, across all concurrent requests) Transfer rate: 602.07 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 1 2 0.7 2 3 Processing: 0 2 1.0 2 3 Waiting: 0 1 1.0 2 3 Total: 4 4 0.3 4 4 WARNING: The median and mean for the waiting time are not within a normal deviation These results are probably not that reliable. Percentage of the requests served within a certain time (ms) 50% 4 66% 4 75% 4 80% 4 90% 4 95% 4 98% 4 99% 4 100% 4 (longest request)
此测试对应20个不同并发用户的400页加载，每个用户正在进行20次连续页面加载.
$ ab -r -n 20 -c 20 -k -H"Accept-Encoding:gzip，deflate"http://127.0.0.1:8000/
... Requests per second: 1619.96 [#/sec] (mean) Time per request: 12.346 [ms] (mean) Time per request: 0.617 [ms] (mean, across all concurrent requests) Transfer rate: 438.21 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 2 6 2.3 6 10 Processing: 1 5 2.9 5 10 Waiting: 0 5 2.9 5 9 Total: 10 11 0.6 11 12 Percentage of the requests served within a certain time (ms) 50% 11 66% 11 75% 12 80% 12 90% 12 95% 12 98% 12 99% 12 100% 12 (longest request)
此测试对应于30个不同并发用户的900页加载，每个用户正在执行30个连续页面加载.
$ ab -r -n 30 -c 30 -k -H"Accept-Encoding:gzip，deflate"http://127.0.0.1:8000/
... Requests per second: 2283.45 [#/sec] (mean) Time per request: 13.138 [ms] (mean) Time per request: 0.438 [ms] (mean, across all concurrent requests) Transfer rate: 617.69 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 2 6 2.7 6 11 Processing: 1 6 3.1 6 11 Waiting: 0 5 3.2 5 10 Total: 11 12 0.5 12 13 Percentage of the requests served within a certain time (ms) 50% 12 66% 12 75% 12 80% 12 90% 13 95% 13 98% 13 99% 13 100% 13 (longest request)
我们现在已经学会了如何在网站上逐渐增加负载并测试其性能.
