Apache Self contained ab How to implement stress testing tools

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Apache Bench brief introduction

Apache Bench yes Apache The server Bring one with you 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.

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 .

For students who want to take a stress test quickly ,apache ab It is a simple and easy-to-use tool , Here is a brief introduction to its use .

ab Installation

#  install #yum -y install httpd-toolsapt-get install apache2-utils#  Check for success ab -v

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

ab Test cases

ab -n 5000 -c 200 http://localhost/index.phpab -n 1000 -c 100 -w http://localhost/index.php >>d:miss.htmlab -n 1000 -c 100 -p request_json.txt -T 'application/json' 'http://192.168.0.101:8088/api/event/annotationEvent'

Example 2

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

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