Installation and use of Apache bench (AB pressure test tool)

1、Apache Bench brief introduction

Apache Bench yes Apache One from the server web Pressure test tools , abbreviation ab .

ab Very practical , It's not just about apache The server carries on the website visit stress test , You can also stress test other types of servers . such as nginx、tomcat、IIS etc.

2、ab Principle

ab Principle ：ab The command creates Multiple concurrent Access thread , simulation Multiple visitors At the same time URL Address Visit .

Its test objectives are based on URL Of , therefore , It can be used to test apache Load pressure , You can also test nginx、lighthttp、tomcat、IIS Others, such as Web Server pressure .

ab Is a command line tool , ab Commands require very little of the computer issuing the load , It doesn't take up too much CPU, It doesn't take up a lot of memory . But it can put a huge load on the target server , The principle is similar CC attack . You should also pay attention to the use of your own test , Otherwise, too much load is put on at once . The target server may run out of resources , It can even crash in severe cases .

in general ab The tools are small and simple , It's faster to learn , It can provide the required basic performance indicators , But there is no graphical result , Can't monitor .

3、ab install

3.1、linux yum install

yum install httpd-tools

perhaps

yum -y install httpd-tools

Test the installation for success ：

[root@vic html]# ab -V
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/

3.2、win10 install

First , Need to install Apache The server , Download address ：https://www.apachelounge.com/download/ ,

Because I am. 64 Bit operating system select , So choose a compressed package above , As shown in the figure below ：

After downloading , Get the following list ：

Direct double click abs.exe Can't open .

The right way is to open cmd command , Get into Apache Bench Of bin Catalog , start-up abs.exe , As shown in the figure below ：

4、 Parameter Introduction ：

 Format ：ab [options] [http://]hostname[:port]/path

 Here are the parameters 

-n requests Number of requests to perform             // The total number of requests initiated by this test 
-c concurrency Number of multiple requests to make　　 // Number of requests generated at one time （ Or concurrent number ）
-t timelimit Seconds to max. wait for responses　　　　// The maximum number of seconds a test is performed , There is no time limit by default .
-r Don't exit on socket receive errors.              //  Throw an exception to continue the test task  
-p postfile File containing data to POST　　    // Contains the need POST Data files for , File format such as “p1=1&p2=2”. How to use it  -p 111.txt

-T content-type Content-type header for POSTing
// POST  Data used  Content-type  Header information , Such as  -T “application/x-www-form-urlencoded” . （ coordination -p）

-v verbosity How much troubleshooting info to print
// Set the detail level of the displayed information  – 4 Or higher will display header information , 3 Or higher to display the response code (404, 200 etc. ), 2 Or higher to display warnings and other information . -V  Show version number and exit .

-C attribute Add cookie, eg. -C “c1=1234,c2=2,c3=3” (repeatable)

//-C cookie-name=value  Attach a... To the request Cookie: That's ok .  Its typical form is name=value One of the parameters of . This parameter can be repeated , Split with a comma .
 Tips ： Can use session Implement the principle transfer  JSESSIONID Parameters ,  Realize the function of keeping conversation , Such as -C ” c1=1234,c2=2,c3=3, JSESSIONID=FF056CD16DA9D71CB131C1D56F0319F8″ .

-w Print out results in HTML tables　　// With HTML Format output result of table . by default , It's a table with two columns of width on a white background .
-i Use HEAD instead of GET

5、 Examples of use

Many parameters , Usually we use -n and -c Parameters are OK . for example ：

abs.exe -n 100  -c 20   Test website 

• -n hinder 100, Indicates a total of 100 A request ;
• -c hinder 20 , Said the 20 concurrent （ simulation 20 Personal simultaneous access ）,
• The following URL indicates the goal of the test URL.

Carry out a simple stress test on Baidu ： abs.exe -n 100 -c 20 https://www.baidu.com/

Running results ：

Document Path: The test page
Document Length: Page size
Concurrency Level: The number of concurrent tests
Time taken for tests: Duration of the whole test
Complete requests: Number of requests completed
Failed requests: Number of failed requests

Total transferred: Network traffic throughout the process
HTML transferred: In the whole process HTML Content delivery
Requests per second: One of the most important indicators , amount to LR Transactions per second in , In the back bracket mean That means that this is an average
Time per request: Two of the most important indicators , amount to LR The average transaction response time in , In the back bracket mean That means that this is an average
Time per request: The average of the actual run time of each connection request
Transfer rate: Average traffic on the network per second , It can help to eliminate the problem of extended response time caused by excessive network traffic

Reprint ：

https://www.cnblogs.com/myvic/p/7703973.html
https://blog.csdn.net/weixin_39089928/article/details/87371792