I want to do browser based load testing with JMeter.This I can achieve by using web diver sampler and a thread group with multiple concurrent users. This limits me to test only with about 10 users as opening more browser instances eats away my system resources.My objective is to see how the GUI behaves when the server is under heavy load (say 1000) users.
As per the Web Driver Tutorial
Note: It is NOT the intention of this project to replace the HTTP Samplers included in JMeter. Rather it is meant to compliment them by measuring the end user load time.
So you should not be creating the main load using the WebDriver Sampler, you can use it in another Thread Group in parallel with the main load conducted by the HTTP Request samplers to measure page rendering speed, catch any markup or JavaScript errors, etc.
Well-behaved JMeter virtual user looks just like a real user using the real browser from backend perspective so make sure you properly mimic real user behavior, to wit:
"embedded resources" handling (images, scripts, styles, fonts, etc.)
cache
headers
cookies
"think times"
Check out How to make JMeter behave more like a real browser for more details.
This is the case to work with Remove/Distributed Testing
Note: The same test plan is run by all the servers. JMeter does not distribute the load between servers, each runs the full test plan. So if you set 1000 Threads and have 6 JMeter server, you end up injecting 6000 Threads.
So in your case if you have 100 JMeter servers each will execute 10 users opening browser.
Related
I am new to jmeter load testing. i am using jmeter test script recorder to record and run the load testing and jmeter capture all type of calls including css,ajax etc.While doing load testing should i ignore css,ajax or i have to include them as well?
Well-behaved JMeter test assumes that each JMeter thread (virtual user) replicates real user with all its stuff including
CSS, JavaScript, fonts, images, etc. downloading
cache
headers
cookies
think times between operations
etc.
So you:
Should not be recording these calls as if you record them - JMeter will execute the calls sequentially
Instead you need to configure JMeter to download these CSS, images, etc. using parallel pool of 6 threads (this is what real browsers do). The same applies to AJAX calls, they're being executed by the same pool of 6 parallel threads. Also remember that JMeter cannot execute client-side JavaScript so you will have to take care of simulating AJAX requests yourself using i.e. Parallel Controller
I want to perform load test on website built on react js with 500 users.
Is it possible with jmeter without selenium plugin?
You can create JMeter test plans and simulate the 500 concurrent users accessing the system.
Record the test script
Correlate the session variables
Add timers
Configure the thread group
Run the test
There are a number of ways to build a JMeter test plan. You can use HTTPS Test Script Recorder or Blazemeter Chrome Extension to record the steps. Then you will have to add timers, correlate the sessions with the JMeter post-processors, etc to simulate the real users.
Ten ways to build your JMeter test plans
In your Thread Group set the Number of Threads (users) to 500 to simulate 500 concurrent users. Add a ramp-up time (e.g 60 seconds).
Note: Timers will simulate the think time of the users or the delays between the requests. You may use Random Timers to simulate different think times.
It is, JMeter doesn't know/care anything about the system under test technology so as long as JMeter supports network protocols used by the application it should be able to replicate the network footprint of the real browser.
Browsers in their turn don't do any magic, they send HTTP requests, wait for responses and render the response in the browser window.
JMeter is capable of sending HTTP requests via HTTP Request sampler so it can load test web applications, including but not limited to react js ones.
Just don't forget to configure JMeter to behave like a real browser:
Configure HTTP Request samplers to retrieve embedded resources (images, scripts, styles, fonts, etc.) from web pages
Use HTTP Cache Manager to simulate browser cache
Use HTTP Cookie Manager to simulate browser cookies
Use HTTP Header Manager to simulate browser headers
Use Timers to simulate real user "think times" (real users don't hammer the website non-stop, they need some time to "think" between operations, read something, type something, etc.)
I need to perform load test on our web application that involves user interaction to the web pages. So i have written selenium scripts to
handle the click events.For,example we have functionalities like some users has to perform signup/registering to our site,some has to login and perform click actions and logout, and a set of users has to visit our home page, click on multiple URL links available on the home page.
In JMeter,i have added one threadgroup each for above mentioned functionalities.Each threadgroup has "JUnit Request Sampler" which calls the selenium methods that has code for performing click actions.
I have setup the "Thread Properties" for the threadgroups to run 200 threads per minute over a span of 5 to 10 mins[target is for 15 mins]
Default browser i am using is "Firefox".I have also set the JMeter properties such that i wouldn't landup into any memory issues.
I am running the scripts in non-gui mode and collecting the result into a jtl file.
The problem i am facing here is, while scripts are executing multiple browsers openup and as each page involves click events,some of the clicks are not happening correctly resulting in increase in error count. If i use very minimal number of threads with time delay then no errors are seen.
I have tried with distributed mode testing as well but there was no major reduce in error count.
I am looking forward for a solution or rather suggestions that can help me out to have minimal or zero errors while running JMeter scripts that involves user interactions and achieve intended load or thereafter increase the load.
Regards
Praveena
As per WebDriver Tutorial it is not recommended to use WebDriver to conduct the load onto the web application
From experience, the number of browser (threads) that the reader creates should be limited by the following formula:
C = B + 1
where C = Number of Cores of the host running the test
and N = Number of Browser (threads).
Looking into Firefox browser requirements I strongly doubt you have a computer with 200 cores and 400 GBs of RAM therefore my expectation is that you should use JMeter's HTTP Request samplers to create the load.
Browsers don't do any magic, they send HTTP Requests and render the responses, so well-behaved protocol-based JMeter tests will look just like a real browser for the application under test. So I would recommend converting your Selenium tests into "pure" JMeter tests, you can leave 1-2 browsers to measure end-user experience when the application is under the load.
I am using jMeter to load test logging in and logging out of my application. I have a CSV with 500 uname and pwords, and I have also set the active threads to 500.
Is this the correct way to stimulate a load of 500 users?
From technical perspective - yes, JMeter will pick up credentials from CSV and send them along with the request.
However if you think about what happens in reality logging in and immediately logging out doesn't seem a realistic use case for me. The whole idea of load testing a web application is simulating real users as close as possible, it includes:
Application usage scenario(s): how many users will be accessing your application at the same time and what users will be doing what things? For example given Stack OverFlow the vast majority of users are searching for answers by given criteria, some users are typing questions, some of them providing answers, and some of them are commenting. These all are different behavioral patterns which need to be accurately simulated by your load test
Each user should have a "user session" which identifies him so application would distinguish different users so make sure you have HTTP Cookie Manager in your Test Plan
Real users use real browsers which are downloading images, CSS and JavaScript files using parallel thread pool (around 5 concurrent threads) to speed up page loading process. In order to mimic this behavior you need to configure HTTP Request samplers to download embedded resources and do it in parallel. You can apply this configuration to all the HTTP Request samplers via HTTP Request Defaults.
Don't forget to add HTTP Cache Manager to mimic browser cache as real browsers normally cache embedded resources to disk and don't re-request them on subsequent calls.
So I would recommend reviewing your test scenario and/or load pattern and get familiarized with How to make JMeter behave more like a real browser article
I have created a Thread Group which has Firefox Driver Config , a Web driver Sampler and a View Results Tree Listener.
I have also added CSV Data set Config and passing username and Passwords through it to the application.
I have around 10 Credentials.
The scenario i want to do is, I want all the 10 users to login at the same time i.e 10 instances of the firefox browser to be invoked and do the job. i have given 10 in the thread group, but the users login 1 after the other.
Basically i am doing a performance testing, So i need all the 10 users to login at the same time(Simultaneously). So that 10 instances of firefox can be invoked at the same time.
Can anyone tell me, how can i achieve this in Jmeter?
Just add Synchronizing Timer to your test plan, if you need to test simultaneous login - put the timer as a child of login webdriver sampler.
I assume that you aware of recommendations from WebDriver Sampler Tutorial like
It is NOT the intention of this project to replace the HTTP Samplers included in JMeter. Rather it is meant to compliment them by measuring the end user load time.
and
JMeter allows the creation of multiple threads, and each thread is responsible for creating load on the server. However, for the Web Driver use case, the reader should be prudent in the number of threads they will create as each thread will have a single browser instance associated with it. Each browser consumes a significant amount of resources, and a limit should be placed on how many browsers the reader should create.
So it is recommended to create main load using JMeter's HTTP Request samplers and using one thread executing WebDriver Sampler to measure real-life user experience. If you still intend to create the main load with the WebDriver Sampler remember that browsers are resource-intensive so you'll need to provide something like 1 core and 1 Gb of RAM to each browser instance so make sure that machine(s) running JMeter have some capacity.