JMeter Interview Questions | JMeter Performance Testing Interview Questions
JMeter is an effective load-testing tool widely used in the software development industry. It simulates user traffic and tests website performance.
Our Interview Questions for JMeter blog aims to explore JMeter interview questions in depth, covering topics such as threads, test plans, and performance analysis.
This performance testing JMeter interview questions blog provides professionals looking to expand their understanding of JMeter and prepare for interviews using it with information that will benefit both JMeter interview questions for experienced and fresher JMeter testers alike.
Beginners, as well as more seasoned JMeter testers alike, are bound to find something worthwhile here.
1. What is JMeter?
JMeter is an open-source Java application designed to load or test functional behaviour and measure performance.
Initially designed for web applications, it has since expanded to other test functions.
JMeter simulates actual user behaviours and performs load tests on servers, groups of servers, networks, or objects.
2. What is the HTTP request case in JMeter?
In JMeter, the HTTP request case is automatically taken in the path dialogue box, which allows you to test an HTTP request’s response.
3. How do you improve performance testing in JMeter?
You can increase the threads and loop count to improve performance testing in JMeter.
This will help you test the application’s performance under different workloads.
4. What are the primary purposes of performance testing?
Performance testing primarily aims to identify and eliminate performance bottlenecks in software applications.
It helps stakeholders understand the application’s speed, stability, and scalability and identifies areas for improvement before the product goes into the market.
5. What are the six types of performance testing?
There are six types of performance testing: load testing, stress testing, volume testing, capacity testing, reliability testing, and scalability testing.
Each type of testing focuses on different aspects of the application’s performance, such as response time, stability, and resource usage.
6. What are the two modes of JMeter?
There are two modes of JMeter: GUI mode and non-GUI mode. GUI mode has limitations, slowing down CPU utilisation while running the recorded script.
However, it is perfect for adding and editing new configuration elements and thread groups, allowing debugging. Select the JMeter.
File in the bin folder to open GUI mode.
7. What are poor performance metrics?
Poor performance metrics can lead to a bad reputation and failure to meet sales goals. Examples include slow response times, high error rates, and low throughput.
8. What is the testing process for web applications?
The testing process for web applications involves several steps, including initial load testing, volume testing, capacity testing, and reliability testing.
These tests help determine the web application’s capacity to support and perform well under varying loads and conditions.
9. What is capacity testing for web applications?
To achieve a specific goal, capacity testing for web applications involves altering resources like process acuity, network bandwidth, memory usage, and disk capacity.
This type of testing helps determine the web application’s ability to meet business volumes and prospects, ensuring the environment can support the increased load and the required resources.
10. What are the limitations of GUI mode in JMeter?
GUI mode has limitations in JMeter, including slowing down CPU usage while running the recorded script.
However, it is perfect for adding and editing new configuration elements and thread groups,allowing debugging.
11. What is reliability testing for web applications?
Reliability testing for web applications verifies if an application can recover from an abnormal state, such as an online trading site experiencing a failure.
This type of testing helps ensure that the application is robust and can handle unexpected events.
12. What are the steps involved in performance testing for web applications?
The steps involved in performance testing for web applications include requirement gathering, tool selection, performance test plan, development, modelling, execution, and a result analysis report.
Each step ensuresthe testing process is booming and the web application meets the required specifications and standards.
13. What are the four steps in the performance testing process?
The four steps in the performance testing process are performance test development, performance test modelling, test execution, and test result analysis.
14. What are the performance testing metrics?
Performance testing metrics include processor usage, memory usage, time, bandwidth, private bytes, commutative memory, response time, throughput, hit ratios, and top weights.
Other metrics include rollback segment, garbage collection, thread counts, hits per second, CPU interruption per second, disk, and Q-length.
15. What is the purpose of test result analysis in performance testing?
The test result analysis is crucial for proving return on investment and productivity.
Giving each test result a unique and meaningful name helps understand its purpose.
16. What are the performance testing metrics used to measure memory leaks?
Performance testing metrics used to measure memory leaks include processor usage, memory usage, and private bytes.
17. What is the purpose of the final step in the performance testing process?
The final step in the performance testing process is the test report, which should be brief, descriptive, and to the point.
18. What is Apache JMeter?
Apache JMeter is a widespread and fast testing tool that simulates user behaviour and performs load tests on various server types, including web applications, web services, LDAB, databases, and shell scripts.
19. What are the advantages of using Apache JMeter?
Apache JMeter is highly capable of creating many virtual users working on web servers, simulating actual user behaviour, and performing load tests on various servers and server types, making it a cost-effective solution for performance testing.
It is also platform-dependent, customisable, recordable in playback, and offers community support.
20. What is the speed of Apache JMeter?
Apache JMeter is around ten times faster than existing software.
21. What is Apache JMeter used for?
Apache JMeter is used for performance testing web applications, web services, LDAB, databases, and shell scripts.
22. What programming language is Apache JMeter written in?
Apache JMeter is written and developed using Java.
23. What are the automation possibilities with Apache JMeter?
Apache JMeter offers various automation possibilities and can load and perform tests on different server types, including web, HTP, HTTPS, database, and JMS.
24. How to use Apache JMeter?
To use Apache JMeter, navigate to the Apache JMeter folder and select the JMeter, and open the JMeter window. T
he test plan element stores all elements used for performance testing.
25. What is the importance of JMeter?
JMeter is a software tool for performance testing. It creates a request and sends it to a server.
The tool collects service responses, visualises them in charts or graphs, and processes them.
The test results are then generated in text, XML, and JSON formats.
26. What is load testing?
Load testing evaluates an app’s performance when numerous people use it.
It defines system performance in real-world situations like a printer or mail server with thousands of users.
Load testing also finds hardware, network, memory, and software configuration problems with web, application, and database servers.
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The options for setting up a thread group in JMeter include action after an error, number of threads, ramp-up period, loop count, and scheduler.
28. How do you add an HTTP request to a thread group in JMeter?
To add an HTTP request to a thread group in JMeter, right-click on the thread group and select the sample option.
Then, add a server name or IP and a link to a website like Simply Learns.
29. What is load testing, and what is its purpose?
Load testing is a technique used to determine an application’s maximum operating capability and performance under different load conditions.
Its purpose is to help determine the number of concurrent users an application can support without performance deterioration.
30. What are some of the tools used for load testing?
Some tools used for load testing include Apache JMeter, web load, load UI, Load Runner, Neo load, and Load Ninja.
31. What is the difference between load testing and stress testing?
Load and stress testing are techniques used to determine an application’s performance under different load conditions.
However, load testing is focused on determining the number of concurrent users an application can support without performance deterioration.
In contrast, stress testing is focused on pushing an application to its limits by testing it beyond its maximum capacity.
32. What is data-driven, and how does it relate to load testing?
Data-driven is the process of extracting useful information from large datasets.
It is often used with load testing to analyse performance data and identify areas for improvement.
This can help improve user satisfaction and ensure the application continues to meet user demands.
33. How do you set up a thread group in JMeter?
To set up a thread group in JMeter, right-click on the performance testing section and select the “thread group” option.
Then, select the desired options, including the number of threads and loop count.
34. What is JMeter, and what does it demonstrate?
JMeter is a low-testing tool that demonstrates its use on various operating systems.
35. What are the two sections in the JMeter window?
The JMeter window is divided into two sections: the test plan elements and their configurations.
36. What is a test plan in JMeter?
A test plan is a container where all elements, requests, and listeners are stored.
37. What are the available options for adding listeners in JMeter?
The number of threads, ramp-up period, look counter, and scheduler are also available.
38. How to add an HTTP request in JMeter?
To add an HTTP request in JMeter, right-click on the thread group, select the sampler option, and choose the HTTP request option.
39. What information is required for an HTTP request in JMeter?
The server’s name or IP box is provided, and a link to the learns website is copied.
In the HTTP request case, HTTP and HTTPS protocols are automatically used.
40. How to increase the load of a website in JMeter?
To increase a website’s load in JMeter, create a new HTTP request and add a unique link to the server and IP address.
Rename the request as resources and save it as load testing JMX.
41. How often will the test be run, and what information will be displayed?
The test will be run ten times, showing the time taken and the number of tests performed on each hit on the website.
This will help improve the website’s overall performance.
42. What is load testing?
Load testing is a process of evaluating the performance of a system or application under heavy load conditions to identify potential bottlenecks and other performance issues.
43. What is non-graphical user mode?
The non-graphical user mode runs JMeter tests without the graphical user interface, allowing for more automation and flexibility in the testing process.
44. What is the purpose of creating and renaming a dot CSV file in the load-testing process?
Creating and renaming a dot CSV file in the load testing process is to store the test results in a format that can be easily read and analysed.
45. What is the importance of using dashboards in load testing?
Dashboards are used in load testing to understand the testing process better and help identify any performance issues that may arise.
46. What is the role of an API in software testing?
An API is essential in software testing, ensuring high user satisfaction and releasing high-quality software.
47. What is the benefit of a successful load-testing process?
A successful load-testing process results in releasing high-quality software that meets the application’s performance and functionality requirements.
48. What is the importance of Apache JMeter?
Apache JMeter is open-source software that simulates various scenarios and outputs performance data in multiple formats, including CSV and XML files and graphs.
It is 100% pure Java and available on every OS that supports Java 6 or later.
49. What are the features of Apache JMeter?
Apache JMeter is ideal for A P I testing due to its fast performance, quick scope tests, load and stress testing capabilities, and its wide range of plugins and extensions.
50. How to use Apache JMeter?
To use JMeter, download it from the Apache JMeter website and install it in the Win folder.
The JMeter window is divided into two sections, with the test plan element on the left side.
The threat group is used to run the test, and it has options for actions, number of threats, ramp-up period, loop count, and scheduler.
51. What is the purpose of clicking the green button in JMeter?
To run a JMeter test, click the green button and select the View Results Tree.
The green status indicates the test was successful, and the results are displayed in a table.
52. What information is provided by the View Results Tree in JMeter?
The View Results Tree provides information about the request, such as sample start, load time, latency error, and response data.
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To add a post request in JMeter, go to the sampler in the thread group, rename the request, paste it into the server name or IP box, and select the post option.
Then, select the body data option in the parameter section and paste it into the JMeter window.
54. What is performance testing?
Performance testing is a crucial aspect of software development that focuses on speed, scalability, and stability.
It involves checking if an application meets load and stress benchmarks.
55. How do you create a new HTTP request in JMeter for automated testing?
To create a new HTTP request in JMeter for automated testing, you should open a request in a new tab, copy the URL, and return to the JMeter window.
Then, please create a new HTTP request, rename it as put API, paste it in the server’s name or IP box, and select the protocol option.
Add body data and paste it into the JMeter window.
56. What is JMeter script recording?
JMeter script recording is an advanced method for recording web browser interactions when JMeter acts as a proxy.
57. What are some of the software products that require excellent quality?
Some software products that require excellent quality include web and mobile applications, as user strength is significant.
58. How do you perform script recording in JMeter?
To record scripts in JMeter, navigate to the Apache JMeter folder and select the JMeter folder.
The JMeter window opens, dividing the test plan into two sections.
Add a thread group, choose the action after an error, the number of threads, the ramp-up period, the time gap between user heads, and the loop count.
Add an HTTP request by entering the server’s name or IP in the server’s name box and placing the link on the website.
59. What are the prerequisites to perform script recording in JMeter?
The prerequisites for performing script recording in JMeter are the installation of JMeter, Java, and Mozilla Firefox.
60. What is the purpose of JMeter script recording?
JMeter script recording aims to record and run web browser interactions when JMeter acts as a proxy.
This allows multiple users to be monitored and recorded while browsing web applications with a standard web browser.
61. What are the benefits of using JMeter for load and performance testing?
The benefits of using JMeter for load testing and performance testing include analysing and measuring the performance of various services, verifying whether the product meets expected or required performance, and ensuring applications perform well under their expected workload.
62. What are some of the testing approaches used in software testing?
Some of the testing approaches used in software testing include functional UI, security, and database testing.
63. How do you run a test with a 10th thread count and 20 times in JMeter?
To run a test with a 10th thread, count it 20 times in JMeter; you should change the number of threads to 10 and rerun the test.
64. What is the importance of performance testing?
Performance testing is a crucial aspect of software development that focuses on speed, scalability, and stability.
It involves checking if an application meets load and stress benchmarks.
65. How does JMeter work?
JMeter is a popular choice among testers due to its open-source nature, Java platform, extensibility, and user-friendly interface.
It allows for easy creation of test plans and configuration of elements, supports scripting, and stores test plans in XML format.
66. What are the critical elements of JMeter?
JMeter consists of four key elements: thread group, samplers, listeners, and configurations.
A test plan describes the behaviour of each component and is saved. The test plan is then run and analysed using various graphical formats.
67. How is JMeter used for performance testing?
JMeter is used for performance testing. It creates test plans that describe the element’s behaviour and saves them.
The test plan is then run and analysed using various graphical formats.
68. What are some of the features of JMeter?
JMeter supports non-functional tests like stress, distributed, and web service testing.
It also supports protocols like HTTP, JDBC, SOAP, JMS, and FTP.
JMeter has a broad user base and an open-source community to assist others.
Its comprehensive documentation provides clear instructions on each step, from installation to generating final reports.
69. What does JMeter offer for testing HTTPS requests and samplers?
JMeter offers various samplers for testing HTTPS and samplers, including FTP requests, HTP requests, JDBC requests, BSF samplers, access log samplers, SMP samplers, listeners, and configuration elements.
These samplers allow for sending FTP download or upload files, HTP requests, JDBC requests, BSF scripting languages, access logs, SMP samplers, and listeners.
70. What is the use of the login-config element in JMeter?
The login-config element in JMeter allows you to add or override username and password settings in samplers.
It can be used to simulate a user login to a website.
71. How can you use JMeter to test HTTPS requests?
To use JMeter to test HTTPS requests, you can specify the URL and path in the HTTPS sampler. The test results can be displayed in a table, graph, tree, or log format.
72. What is a thread group in JMeter?
A thread group in JMeter represents a user using the application under test. It can be used to simulate multiple users accessing the application simultaneously.
73. How do thread properties work in JMeter?
Thread properties in JMeter control the behaviour of threads after a sampler error.
They allow you to specify how the thread should continue with the test, start the next thread loop, stop the thread, or stop the test.
74. How do you test REST APIs with Apache JMeter?
To test REST APIs with JMeter, search for sample APIs in a browser and create a get post, put, and delete REST API request.
Copy the URL for the request and paste it into the JMeter window.
In the sampler’s box, select samplers and choose the HTTP request. Enter the address of home pages or websites, server name or IP, and protocol.
Paste the get A P I request URL, remove the path, and add parameters. Name the request as contact API.
75. What is the difference between a graph, tree, and table format in JMeter?
In JMeter, test results are displayed in graph, tree, and table formats.
A graph shows the results as a graph a tree says the results as a tree, and a table shows the results as a table.
76. What is the importance of using the correct URL and path for testing in JMeter?
Using the correct URL and path for testing in JMeter is essential because it ensures that the test is directed to the correct server and resource.
The test may not produce accurate results if the URL or path is incorrect.
77. What is the purpose of JMeter?
JMeter is a tool for creating and executing test plans on web pages and websites. It offers various components called elements, each designed for a specific purpose.
The main element in JMeter is the thread group, a collection of threads representing one user using the application under test.
Each thread simulates an actual user request to the server.
78. What is a listener in JMeter?
A listener in JMeter is an element that displays test results in various formats, such as tree, table, graph, or log files.
79. What is the main element in JMeter?
The main element in JMeter is the thread group, which contains multiple threads. It allows users to send requests and receive responses.
80. What are the controls for a thread group in JMeter?
The controls for a thread group in JMeter allow you to set the number of threads for each group, such as 100.
This allows JMeter to simulate 100 user requests to the server under test.
JMeter is an indispensable tool for load testing and performance testing web applications. It offers an array of features and capabilities suitable for various testing scenarios.
JMeter boasts the capability to simulate large numbers of users while supporting different protocols and test plans, not to mention its seamless integration into other tools and systems.
Our Interview Questions on JMeter blog provides a comprehensive look at JMeter interview questions. We will cover subjects that are essential for the interview.
To become proficient with JMeter, it is vital to possess an in-depth knowledge of its fundamental principles and concepts, features, capabilities, and user interface.
Web application architecture and design principles, performance metrics and best practices, and PDFs all assist when using it effectively.
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