使用Apache自帶的ab測試工具，10個並發是會有多少請求量，並發量是怎麼算的，是1秒鐘的請求數還是多長時間內的請求算並發
D:\wamp\bin\apache\apache2.4.9\bin>ab -n 100 -c 10 http://www.baidu.com/
This is ApacheBench, Version 2.3 <$Revision: 1554214 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking www.baidu.com (be patient).....done
Server Software: BWS/1.1
Server Hostname: www.baidu.com
Server Port: 80
Document Path: /
Document Length: 52980 bytes
Concurrency Level: 10
Time taken for tests: 12.121 seconds
Complete requests: 100
Failed requests: 99
(Connect: 0, Receive: 0, Length: 99, Exceptions: 0)
Total transferred: 5368249 bytes
HTML transferred: 5300179 bytes
Requests per second: 8.25 [#/sec] (mean)
Time per request: 1212.069 [ms] (mean)
Time per request: 121.207 [ms] (mean, across all concurrent requests)
Transfer rate: 432.52 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 25 119 522.7 27 3103
Processing: 56 1067 1384.7 246 3691
Waiting: 27 207 603.1 84 3157
Total: 87 1186 1431.0 273 3717
Percentage of the requests served within a certain time (ms)
50% 273
66% 445
75% 3268
80% 3276
90% 3357
95% 3457
98% 3631
99% 3717
100% 3717 (longest request)
D:\wamp\bin\apache\apache2.4.9\bin>
這一句說明的是百度的平均並發量只有8.25？
Requests per second: 8.25 [#/sec] (mean)
PHP中文网2017-05-16 17:05:46
10個並發就是瞬間10個請求到伺服器上去，如果伺服器處理的快，那麼就繼續，但是使用參數中有請求總數，其實就是以每次10個並發的方式將你設定的請求總數都壓到伺服器上去，看伺服器多久可以處理完，計算平均每秒的回應狀況
