Mr. Ali taught you how to use JMeter for pressure test (detailed drawing)

One . Preface

Stress testing is the key to every project Web A test that needs to be done before an application goes online , He can help us find bottlenecks in the system , Reduce the chance of problems after being released to the production environment ; Estimate the carrying capacity of the system , So that we can make some countermeasures according to it . So stress testing is a very important step , Now I'll take you to use a stress testing tool JMeter.

Two . About JMeter

Apache JMeter yes Apache Organization development based on Java Pressure testing tools for . For stress testing software , It was originally designed for Web Application testing , But then it expanded to other areas of testing . It can be used to test static and dynamic resources , For example, static files 、Java Little service program 、CGI Script 、Java object 、 database 、FTP The server , wait .JMeter Can be used for server 、 Network or object simulating huge load , Test their strength and analyze their overall performance from different stress categories . in addition ,JMeter Ability to function on Applications / regression testing , Verify that your program returns what you expect by creating a script with assertions . For maximum flexibility ,JMeter Allow regular expressions to create assertions .

Apache jmeter Can be used for static and dynamic resources （ file ,Servlet,Perl Script ,java object , Databases and queries ,FTP Servers and so on ） Test the performance of . It can be used on servers 、 Networks or objects simulate heavy loads to test their strength or analyze the overall performance under different types of stress . You can use it for performance analysis of graphics or for testing your server with large concurrent loads / Script / object .

3、 ... and . preparation

because JMeter It's using JAVA Written , So use JMeter Before , Install first JAVA Environmental Science , In this article, it's better to install JAVA The environment ..

JAVA Environment variable configuration ：（ What you don't understand can be inquired by Baidu experience ）

Unzip the downloaded binary package , Get into bin Catalog , Use jmeter.bat Start the program .

After startup, there will be two windows , One cmd window , One JMeter Of GUI. Don't ignore the front CMD Window prompt message ：

 JMeter:

 CMD Window prompt message

================================================================================

Don't use GUI mode for load testing !, only for Test creation and Test debugging.

For load testing, use NON GUI Mode:

jmeter -n -t [jmx file] -l [results file] -e -o [Path to web report folder]

& increase Java Heap to meet your test requirements:

Modify current env variable HEAP="-Xms1g -Xmx1g -XX:MaxMetaspaceSize=256m" in the jmeter batch file

Check : https://jmeter.apache.org/usermanual/best-practices.html

================================================================================

It means ： Do not use GUI Run the pressure test ,GUI For stress test creation and debugging only ; Do not use when performing stress tests GUI. Use the following command to execute the test ：

jmeter -n -t [jmx file] -l [results file] -e -o [Path to web report folder]

And modify JMeter Environment variables for batch files ：HEAP="-Xms1g -Xmx1g -XX:MaxMetaspaceSize=256m"

Change the language to Chinese

The official default is to provide us with simplified Chinese . adopt 【Options】->【Choose Language】 Change to simplified Chinese

 

Four . Create the test

1. Create thread group

stay “ test plan ” Right click 【 add to 】-->【Threads(Users)】-->【 Thread group 】.

  Set the number of threads and the number of loops . I set the number of threads here to 500, Cycle time .

2. The configuration element

Right click on the thread group we just created 【 add to 】-->【 The configuration element 】-->【HTTP Request defaults 】.

 

Configure the program protocol we need to test 、 Address and port

 

When all interface tests have the same access domain name and port , You can use this component , Once the server address changes , Just change the default value of the request .

3. structure HTTP request

stay “ Thread group ” Right click 【 add to -】->【samlper】-->【HTTP request 】 Set up what we need to test API Request path and data for . I use it here json

 

4. add to HTTP Request header

Right click on the thread group we just created 【 add to 】-->【 The configuration element 】-->【HTTP Header Manager 】.

Because the data I want to transmit is json, So set up a Content-Type:application/json

 

5. Add assertions

Right click on the thread group we just created 【 add to 】-->【 Assertion 】-->【 Response assertion 】.

Judge whether the request is normal according to the response data . I will only judge whether the response code is 200. You can also configure error messages

 

6. Add view result tree

Right click on the thread group we just created 【 add to 】-->【 Monitor 】-->【 Look at the fruit tree 】.

Add... Directly , Then click the run button to see the results .

 

7. add to Summary Report

Right click on the thread group we just created 【 add to 】-->【 Monitor 】-->【Summary Report】.

Add... Directly , Then click the run button to see the results .

 

In order not to cause unnecessary argument , Hide the TPS. This data has no value , Just for the article demonstration .

8. Test plan created

Remember to save .

5、 ... and . Execute test plan

We said earlier , Executing a test plan doesn't work GUI, It needs to be executed from the command line .

 

 

The order I'm executing here is ：

explain ：

testplan/RedisLock.jmx Plan file path for test

testplan/result/result.txt Path to test results file

testplan/webreport by web Report save path

Web The report is as follows ：

 

6、 ... and . summary

The number of threads and the number of loops will affect the final test report , Please test more . Thank you for coming along ~

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