How can I execute those JMeter recorded script in parallel as we do while creating HTTP SAMPLER (Embedded HTTP Resource) ?
While recording I also checked Retrieve All Embedded Resource with pool of 6. Because of this I getting incorrect response time(Varies from browser timing of page).
Is there any way that we could execute our recorded HTTP Samplers in parallel?
As of JMeter version 3.2 it is not possible to kick off extra threads to run a specific sampler(s) group in parallel, each thread (virtual user) executes samplers upside down.
So you should be very careful with what you are recording. For example, you must not be recording any embedded resources calls, there is `URLs Patterns to Exclude" input on the "Requests Filtering" tab of the HTTP(S) Test Script Recorder where you can define which resources need to be excluded from the recording.
Remember that well-behaved JMeter test should be producing response time similar to real browser, but you need to configure JMeter to mimic real browser, to wit:
Add HTTP Header Manager to represent browser headers
Add HTTP Cookie Manager to represent browser cookies and deal with cookie-based authentication
Add HTTP Cache Manager to act like browser's memory and disk caches
See How to make JMeter behave more like a real browser guide for more information on JMeter fine tuning.
Related
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.)
We need to test our web application with 100+ users with JMeter tool.
Should we use JMeter webdriver plugin to launch the real browsers or can we use the blazemeter plugin to generate the script and run in JMeter? Will the script created with blazemeter simulate the real browser load?
Theoretically you can use real browsers, but be aware that browsers are very resource intensive so my expectation is that you will need at least one CPU core and at 1 GB of RAM per browser instance in order to have enough resources.
This means you will have to go for distributed testing and on average you will have one slave per 5 browsers. If this is something you can afford - go for it. If don't - be aware that you can configure JMeter to behave like a real browser, to wit:
Tell JMeter to Retrieve All Embedded Resources from HTML Files and Use concurrent pool of 6 threads. This can be done using HTTP Request Defaults, the settings live under "Advanced" tab
Add HTTP Cache Manager to simulate browser cache
Add HTTP Cookie Manager to mimic browser cookies
Add HTTP Header Manager to send browser-like headers (i.e. User-Agent, Accept-Encoding, etc.)
If your application uses AJAX requests - put the relevant HTTP Request samplers under the Parallel Controller
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.
I am trying to setup a JMeter load test, using the Recording Controller.
This results in duplication of all the calls the web browser would make - including css files, js files and images.
Given that a web browser would get these concurrently (performing approximately 10 web requests concurrently). The jmeter documentation tends to equate 1 user to 1 thread - but this does not line up with the way in which modern web browsers work.
Do I need to use 10 threads for each user when setting up my load test?
Strictly Speaking, JMeter can't simulate a browser. JMeter has its own limitations, like not parsing .js files (as per 3.0 version), sending ajax requests from events etc.
But, for your question, there is support in JMeter.
So, you can specify the concurrent pool size as per your requirements, say concurrent pool size value set to 10, which would solve your issue.
Today browser normally sends requests concurrently and each browser has its own max value for maximum connections that can be made concurrently.
Refer following links:
Max parallel http connections in a browser?
and How to solve Chrome's 6 connection limit when using xhr polling.
When you use "Retrieve Embedded Resources" and set Concurrent Pool Size, you ONLY need to add parent sampler, which triggers resource requests like .css, .js files by Jmeter itself. (Eg: add only stackoverflow.com and it will load all the resources like .css, .js automatically). During recording , all these requests are seperately recorded, so you need to remove all of them or create a new plan/thread group containing only parent sampler.
Note: As I mentioned, requests triggered from .js, .csv won't be sent as Jmeter won't parse them like Browser. You need to add ONLY these requests as samplers explicitly. Add View Results Tree and compare the requests triggered by Jmeter and Browser (F12 -> Network tab) to know which request are missing by Jmeter.
First of all, don't record requests to embedded resources. If you click Add Suggested Excludes button the HTTP(S) Test Script Recorder will automatically populate a regular expression to filter images, scripts and styles.
Second. To simulate browser behaviour: 1 main request to the page and several parallel requests to retrieve content you can use "Advanced" tab of the HTTP Request Sampler (or even better HTTP Request Defaults). You can also limit embedded resources to your application under test domain there
Real browsers download images, styles and scripts. However well-behaved browsers do it only once, on subsequent requests these entities are being returned from cache. So make sure you add HTTP Cache Manager to your Test Plan to represent browser cache so you could avoid overwhelming your server with extra requests which don't happen in the reality.
See How To Make JMeter Behave More Like A Real Browser for more detailed explanation and instructions on using aforementioned Test Elements
When I have given 500 concurrent users load via jmeter my server throwing error message but the same time I have called same request via browser showing proper response. How it is possible? Is there any settings in jmeter for avoiding same.
It is hard to say what can go wrong without seeing your JMeter configuration, full server response, JMeter and application under test logs and network dump for browser and JMeter.
The whole idea of performance testing is mimicking real user as close as possible, so you need at least
Add HTTP Request Defaults and set JMeter to:
Download embedded resources
Use concurrent pool of 2-5 threads
Add HTTP Cookie Manager
Add HTTP Cache Manager
Add HTTP Header Manager
Correlate any dynamic parameters
Simulate any specific application behaviour (i.e. AJAX calls)
etc.
In addition to above recommendations: ideally given "good" JMeter you shouldn't see any "response messages", you should see a number of errors in final report so double check you:
Run JMeter in non-GUI mode
Storing only those metrics which are absolutely required
Follow other recommendations from 9 Easy Solutions for a JMeter Load Test “Out of Memory” Failure
beside, what Dmitri described above, I would also check the actual throughput the server returns in either cases.
Throughput depends a lot on the timers you configured in Jmeter to simulate think time.
Jmeter has no rendering and no javascript engine, so each thread is much much faster than a real browser.