apache压力测试工具,下载到电脑后，运行cmd打开dos，进入到ab下载的路径下，执行ab命令（通过help查看参数），可以测试当前tomcat压力，简单用用
参数说明：
E:\Tomcat6.0\apache-tomcat-6.0.37-windows-x86\apache-tomcat-6.0.37\bin>ab
ab: wrong number of arguments
Usage: ab [options] [http://]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
-p postfile File containing data to POST
-T content-type Content-type header for POSTing
-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
-h Display usage information (this message)
实际使用：
E:\Tomcat6.0\apache-tomcat-6.0.37-windows-x86\apache-tomcat-6.0.37\bin>ab -n 1000 -c 300 http://localhost:8080/mc/login.jsp
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 1997-2005 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
Finished 1000 requests
Server Software: Apache-Coyote/1.1
Server Hostname: localhost
Server Port: 8080
Document Path: /mc/login.jsp ###请求的资源
Document Length: 949 bytes ###文档返回的长度，不包括相应头
Concurrency Level: 300 ###并发个数
Time taken for tests: 19.109375 seconds ###总请求时间
Complete requests: 1000 ###总请求数
Failed requests: 11 ###失败的请求数
(Connect: 11, Length: 0, Exceptions: 0)
Write errors: 0
Non-2xx responses: 1000
Total transferred: 1118000 bytes
HTML transferred: 949000 bytes
Requests per second: 52.33 [#/sec] (mean) ###平均每秒的请求数
Time per request: 5732.813 [ms] (mean) ###平均每个请求消耗的时间
Time per request: 19.109 [ms] (mean, across all concurrent requests) ###上面的请求除以并发数
Transfer rate: 57.09 [Kbytes/sec] received ###传输速率
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 7 66.4 0 1093
Processing: 15 3901 5972.0 1015 17046
Waiting: 0 3612 5927.3 515 16578
Total: 15 3909 5977.0 1015 17046
Percentage of the requests served within a certain time (ms)
50% 1015 ###50%的请求都在7778Ms内完成
66% 1015
75% 1468
80% 13500
90% 16578
95% 16593
98% 17046
99% 17046
100% 17046 (longest request)
E:\Tomcat6.0\apache-tomcat-6.0.37-windows-x86\apache-tomcat-6.0.37\bin>