高级性能测试系列《32. 性能测试工具：ab 》

#  centos
[root@centos7 wrk]# yum install httpd-tools -y

# ubuntu
apt-get -y install apache2-utils

# 获得版本信息：
ab -v

ab --help

   总共的请求数量:
    -n requests     Number of requests to perform
    
    并发用户数：
    -c concurrency  Number of multiple requests to make at a time
    
    时间的限制：
    -t timelimit    Seconds to max. to spend on benchmarking
                    This implies -n 50000
    超时时间：
    -s timeout      Seconds to max. wait for each response
                    Default is 30 seconds
    -b windowsize   Size of TCP send/receive buffer, in bytes
    -B address      Address to bind to when making outgoing connections
    
    发一个post请求的时候也是个post文件：
    -p postfile     File containing data to POST. Remember also to set -T
    
    

[root@centos7 ~]# ab -c10 -t30 https://www.baidu.com/
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 www.baidu.com (be patient)
Finished 121 requests


Server Software:        BWS/1.1
Server Hostname:        www.baidu.com
Server Port:            443
SSL/TLS Protocol:       TLSv1.2,ECDHE-RSA-AES128-GCM-SHA256,2048,128

Document Path:          /
Document Length:        227 bytes

Concurrency Level:      10
Time taken for tests:   30.137 seconds
Complete requests:      121
Failed requests:        0
Write errors:           0

总共的事务数：
Total transferred:      134428 bytes

html的大小：
HTML transferred:       27467 bytes

每秒请求的数量：
Requests per second:    4.01 [#/sec] (mean)

10个并发用户数总的事务每秒：
Time per request:       2490.697 [ms] (mean)

每个并发用户数的tps值是多少：
Time per request:       249.070 [ms] (mean, across all concurrent requests)

每秒传输多少kb的数据：
Transfer rate:          4.36 [Kbytes/sec] received

响应时间相关的数据：

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:      135 1567 1648.6   1423    8081
Processing:    39  305 265.6    224     990
Waiting:       38  303 265.6    214     990
Total:        176 1873 1668.8   1922    8174

Percentage of the requests served within a certain time (ms)
  50%   1898
  66%   2260
  75%   2338
  80%   2372
  90%   2851
  95%   3593
  98%   7829
  99%   7946
 100%   8174 (longest request)

服务器信息

性能测试概况

时间消耗:
mim  mean  [+/-sd]  median max 最小值、平均值、方差、中位数、最大值。
connect      socket链路建立消耗，代表网络状况。 
Processing   写入缓冲区消耗+链路消耗+服务器消耗。 
waiting      写入缓冲区消耗+链路消耗+服务器消耗+读取数据消耗。 
Total        单个事务总时间 

聚合报告