windows下：

http://jingyan.baidu.com/article/e3c78d647a57833c4c85f502.html

linux下，如果没有装apche,先要装一下ab:

测试工具安装(以centos系统为例)yum -y install httpd-tools

ab 的用法是：ab [options] [http://]hostname[:port]/path

例如：ab -n 5000 -c 200 http://localhost/index.php

上例表示总共访问http://localhost/index.php这个脚本5000次，200并发同时执行。

ab常用参数的介绍：

-n ：总共的请求执行数，缺省是1；

-c： 并发数，缺省是1；

-t：测试所进行的总时间，秒为单位，缺省50000s

-p：POST时的数据文件

-w: 以HTML表的格式输出结果

下面是一个完整的测试：

[root@localhost public]# ab -n 100 -c 100 http://www.hu-rong.com
ab: invalid URL
Usage: ab [options] [http[s]://]hostname[:port]/path
Options are:
    -n requests     Number of requests to perform
    -c concurrency  Number of multiple requests to make
    -t timelimit    Seconds to max. wait for responses
    -b windowsize   Size of TCP send/receive buffer, in bytes
    -p postfile     File containing data to POST. Remember also to set -T
    -u putfile      File containing data to PUT. Remember also to set -T
    -T content-type Content-type header for POSTing, eg.
                    'application/x-www-form-urlencoded'
                    Default is 'text/plain'
    -v verbosity    How much troubleshooting info to print
    -w              Print out results in HTML tables
    -i              Use HEAD instead of GET
    -x attributes   String to insert as table attributes
    -y attributes   String to insert as tr attributes
    -z attributes   String to insert as td or th attributes
    -C attribute    Add cookie, eg. 'Apache=1234. (repeatable)
    -H attribute    Add Arbitrary header line, eg. 'Accept-Encoding: gzip'
                    Inserted after all normal header lines. (repeatable)
    -A attribute    Add Basic WWW Authentication, the attributes
                    are a colon separated username and password.
    -P attribute    Add Basic Proxy Authentication, the attributes
                    are a colon separated username and password.
    -X proxy:port   Proxyserver and port number to use
    -V              Print version number and exit
    -k              Use HTTP KeepAlive feature
    -d              Do not show percentiles served table.
    -S              Do not show confidence estimators and warnings.
    -g filename     Output collected data to gnuplot format file.
    -e filename     Output CSV file with percentages served
    -r              Don't exit on socket receive errors.
    -h              Display usage information (this message)
    -Z ciphersuite  Specify SSL/TLS cipher suite (See openssl ciphers)
    -f protocol     Specify SSL/TLS protocol (SSL2, SSL3, TLS1, or ALL)
[root@localhost public]# ab -n 100 -c 100 http://www.hu-rong.com/index.php
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 www.hu-rong.com (be patient).....done


Server Software:        nginx
Server Hostname:        www.hu-rong.com
Server Port:            80

Document Path:          /index.php
Document Length:        21966 bytes

Concurrency Level:      100
Time taken for tests:   7.392 seconds
Complete requests:      100
Failed requests:        0
Write errors:           0
Total transferred:      2357528 bytes
HTML transferred:       2320439 bytes
Requests per second:    13.53 [#/sec] (mean)
Time per request:       7391.820 [ms] (mean)
Time per request:       73.918 [ms] (mean, across all concurrent requests)
Transfer rate:          311.46 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:       11  749 1248.5     96    3037
Processing:    44 2361 1763.3   2064    7151
Waiting:       29  630 595.0    415    3061
Total:        122 3110 2002.9   3629    7234

Percentage of the requests served within a certain time (ms)
  50%   3629
  66%   4245
  75%   4644
  80%   4947
  90%   5532
  95%   6486
  98%   6776
  99%   7234
 100%   7234 (longest request)
[root@localhost public]#