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This article mainly introduces how Java uses JMeter for high concurrency testing, which has a certain reference value. Interested friends can refer to it. I hope you can learn a lot after reading this article.

Software stress testing is a kind of behavior to ensure the quality of software. It is widely used in finance, e-commerce and other fields. Generally speaking, stress testing is to simulate a large number of users to test the software system under certain hard conditions. It should be noted that the purpose of stress testing is not to make the software flawless, but to test the load limit of the software through stress testing, so as to re-optimize performance or control risk in the actual application environment.

Common stress testing tools:

1. LoadRunner: many commonly used protocols are supported and the versions supported by individual protocols are relatively high. Flexible load stress testing schemes can be set.

A visual graphical interface can monitor rich resources; reports can be exported to Word, Excel, and HTML formats.

LoadRunner official website: https://saas.hpe.com/zh-cn/software/loadrunner

2.NeoLoad is a load and performance testing tool from Neotys that realistically simulates user activity and monitors infrastructure health, eliminating bottlenecks in all Web and mobile applications. Through the use of scriptless GUI and a series of automation features, NeoLoad can increase the speed of test design by 5-10 times and maintain the maintained script at 10% of the original design time, while helping users to test automatically using the continuous integration system.

NeoLoad supports WebSocket, HTTP1/ 2, GWT, HTML5, AngularJS, Oracle Forms and other technical protocols, and can monitor various IT infrastructures, including operating systems, application servers, Web servers, databases and network devices, and initiate external pressure through the Neotys cloud platform.

Official website link: http://www.neotys.com/product/overview-neoload.html

3.JMeter: an open source testing tool designed specifically for running and server load testing, 100% pure Java desktop runner.

It was originally designed for Web/HTTP testing, but it has been extended to support a variety of test modules.

It runs with modules of HTTP and SQL (using JDBC). It can be used to test the operation of servers in static or active databases

It can be used to simulate the operation of the server or network system under heavy load. It also provides an alternative interface for customizing data display.

Test synchronization and test creation and execution. Multi-platform support, can be run on Linux,Windows,Mac

Official website link: http://jmeter.apache.org/

Use JMeter for high concurrency testing 1. Download and install JMeter

Download JMeter 5.0and extract the downloaded apache-jmeter-5.0.zip to a fixed directory.

Then configure the jmeter environment:

1. Modify the variable JMETER_HOME. The value is the actual compression path.

two。 Modify the Path variable to append the following content:% JMETER_HOME%\ bin

3. Modify or add the CLASSPATH variable to add the following:

% JMETER_HOME%\ lib\ ext\ ApacheJMeter_core.jar;%JMETER_HOME%\ lib\ jorphan.jar;2. Use JMeter for testing

Open a command prompt window, enter the "jmeter" command to start JMeter, or open jmeter.bat under bin, as shown in the figure:

Set the jmeter language to Chinese

Add a test plan

Add thread group

Set thread parameters

Number of threads: number of threads to start

Ramp-Up Period (in seconds): thread startup interval. If 0, it represents the number of threads started at the same time, that is, the number of concurrency.

Number of cycles: number of requests executed

Add http request

Set http request correlation coefficient

Add a View result Tree listener

Start the test plan

View test results

3. Generate test report

Jmeter- n-t D:\ jmeter\ jmeter-5.0\ backups\ Test Plan .jmx-l d:\ jmeter\ result.jtl-Emuro d:\ result

Parameter description:

) n: execute JMeter in non-GUI mode

) t: the path to the script file (.jmx file)

) l: specifies the save file (.jtl format) that generates the test results, which must not exist

) e: generate a test report after the test is over

) o: the path used to store test reports

4. Analysis and test report

APDEX is an international general standard, which is a quantitative value of users' satisfaction with application performance. Two user satisfaction thresholds are defined, which are the specific values quantified by combining the response time of all threads in concurrent testing.

Requests Summary (request Summary)

It represents the specific proportion of the number of successful and failed requests. OK indicates successful execution, KO indicates failure, and JMeter mainly judges the success and failure of requests by whether the HTTP status code is 200 or not.

Statistics (Comprehensive Statistical Chart)

Statistics is a comprehensive statistical chart of request response time and response status, including the number of requests, the number of request failures, the proportion of request errors, average response time, minimum response time, maximum response time and so on.

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