apache中ab命令做压力测试

D:\Program Files\Apache Software Foundation\Apache2.2\bin>ab -n1000 -c10 http://
localhost/
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Completed 1000 requests
Finished 1000 requests


Server Software:        Apache/2.2.11
Server Hostname:        localhost
Server Port:            80

Document Path:          /
Document Length:        44 bytes

Concurrency Level:      10
Time taken for tests:   0.906 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      314000 bytes
HTML transferred:       44000 bytes
Requests per second:    1103.94 [#/sec] (mean)
Time per request:       9.058 [ms] (mean)
Time per request:       0.906 [ms] (mean, across all concurrent requests)
Transfer rate:          338.51 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   1.6      0      16
Processing:     0    9   7.9     16      31
Waiting:        0    8   7.9     16      31
Total:          0    9   7.9     16      31
WARNING: The median and mean for the waiting time are not within a normal deviat
ion
        These results are probably not that reliable.

Percentage of the requests served within a certain time (ms)
  50%     16
  66%     16
  75%     16
  80%     16
  90%     16
  95%     16
  98%     16
  99%     16
 100%     31 (longest request)

?-n1000

????? 代表总请求数位1000

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-c10

????? 表示并发用户数为10

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http://localhost/

????? 表示这些请求的目标URL

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Server Software

????? 表示被测试的Web服务器软件名称

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Server Hostname

????? 表示请求的URL中的主机部分名称

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Server Port

????? 表示被测试的web服务器软件的监听端口

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Document Path

????? 表示请求的URL中的根绝对路径

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Document Length

????? 表示HTTP响应数据的正文长度

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Concurrency Level

????? 表示并发用户数，这是我们设置的参数

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Time taken for tests

????? 表示所有这些请求被处理完成所花费的总时间

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Complete requests

????? 表示总请求数，这是我们设置的参数

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Failed requests

????? 表示失败的请求书

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Total transferred

?????? 表示所有请求的响应数据长度总和，包括每个HTTP响应数据的头信息和正文数据的长度。这里不包括HTTP请求数据的长度，即代表了从web服务器流向用户PC的应用层数据总长度

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HTML transferred

????? 表示所有请求的响应数据中正文数据的总和，也就是Total transferred中HTTP响应数据中头信息的长度

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Requests per second

????? 重点关注的吞吐率，它等于Complete requests / Time taken for tests

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Time per request

????? 用户平均请求等待时间，它等于Time taken for tests / (Complete requests / Concurrency Level)

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Time per request(across all concurrent requests)

????? 服务器平局请求处理时间，它等于Time taken for test / Complete requests。它是吞吐率的倒数，同时，它也等于Time per request / Concurrency Level

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Transfer rate

????? 表示这些请求在单位时间内从服务器获取的数据长度，它等于Total trasferred / Time taken for tests。这个统计项可以很好地说明服务器在处理能力达到极限时，其出口带宽的需求量

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Percentage of the request served within a certain time(ms)

????? 这部分数据用户描述每个请求处理时间的分布情况，比如上面的测试结果显示99%的请求的处理时间都不超过1ms

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