I have to do a performance test for application(It has UI) ,It has API requests ,how to find the browser rendering time for APIs , can we do it with retrieve embedded resource. I am quite new to this ,Can someone please guide me.
Not really, as per JMeter project main page:
JMeter is not a browser, it works at protocol level. As far as web-services and remote services are concerned, JMeter looks like a browser (or rather, multiple browsers); however JMeter does not perform all the actions supported by browsers. In particular, JMeter does not execute the Javascript found in HTML pages. Nor does it render the HTML pages as a browser does (it's possible to view the response as HTML etc., but the timings are not included in any samples, and only one sample in one thread is ever displayed at a time).
The only way to measure browser rendering time is using a real browser, if you want to do this along with the existing JMeter performance tests - go for WebDriver Sampler, it provides JMeter integration with Selenium browser automation framework so you will be able to kick off a real browser and measure its rendering time (response time of the WebDriver Sampler will be the time from opening the page till the rendering finishes.
If you need the breakdown - consider using Navigation Timing API
I have created test by recording mobile app trafic and it contains all api calls . so far it is good. I want to achive page load time along with this. is there any plugin or solution avilabel to get the screen load time using jmeter same as we do using webdriver plugin for web applications.
App screen load time means not only API but GUI rendering. Considering that, I dont think jmeter can help.
What can?
Stop watch...Very bad answer but think what a user experience while operating is the time.
Check andriod UI montitoring tools;-
https://developer.android.com/training/testing/performance
Thats what I know.
How can we test different elements' response time? I am really quite new to Jmeter. But nowhere could I find how to test response time of some particular elements only e.g. assume that in a page there are many images present. Are they loaded properly ? If yes, how much time they took?
I will be really grateful if you could help me with that by providing some link or tutorial.
Jmeter is server side testing tool.(jmeter will give you total response time for response containing images and other payload at a specific load on server)
What you are asking comes under client side page rendering.
For loading of images you can use client side tools and browser plugins or profilers.
I would prefer browser plugins for this like firebug, pagespeed or performance testing sites like GTMetrix etc.
they will give total page rendering time (for all requests,images,reponse,css,js everything)
Hope this solves your question
I am trying to build page performance related utilities in selenium framework on .NET. For page performance I am considering page load time and page weight as the outputs. I am planning to calculate page timing metrics using WebTimings API of the browser. But I am not able to find out any way I'll be able to get the size of the page that gets loaded, programmatically
Are there any libraries that will help me achieve it? Or can Selenium be used for this use case?
Does page weight mean the sum size of all the resources that get downloaded, or just a .html file? What should I consider when I want to calculate page weight?
Yes, I think you want to do something using Browsermob Proxy , which will give you all those stats via a .har file .
There seems to be a lot of stress/load testing tool that support AJAX.
I am wondering how well does these tool implemented.
Do they only record http request and replay it?
Is it the right way to test AJAX app?
How does google test their ajax apps?
Most of the load testing tools out there do AJAX load testing the same way: they execute the raw HTTP traffic that is seen during a "recording" phase (which can be page requests, image requests, or even AJAX requests). The main difference among them is how good their recorder/IDE tool is and how easily it helps you parameterize the HTTP requests such that they reflect real world traffic based on dynamic/realtime results.
Warning, blatant plug: The only real exception to this is my company, BrowserMob. Instead of simulating the traffic observed, it actually uses real web browsers to drive back load. As such, the AJAX stuff is handled by the browser.
Useful link: Separate from the blatant plug above (though I do hope you check it out - we're up front with the pricing and provide a free trial), I recently wrote an article for Ajaxian about AJAX load testing. It goes in to more detail about the technical implications of using real browser users (RBUs) vs. virtual users (VUs).
Take a look at LoadBooster(https://www.loadbooster.com). It utilizes headless scriptable browser PhantomJS/CasperJs to test web sites. Phantomjs will parse and render every page, execute the client-side script. The headless browser approach is easier to write test scenarios to support complex AJAX heavy Web 2.0 app，browser navigation, mouse click and keystrokes into the browser or wait until an element exists in DOM. LoadBooster support selenium HTML script too.
Disclaimer: I work for LoadBooster.
If you are worried about functionality only, something like Watin, Watir, Selenium or any functional tool for that matter would work. As long as you put sufficient timing in your functional tests to allow for ajax callbacks then that should do the trick.
To add to my response,
If you are talking about unit testing your javascript you could use something like qunit as described by a fellow LosTechian in this posting. This is a pretty inventive use of an nunit addin and qunit for integrating js unit tests.
By pure coincidence, the same person that posted that qunit testing blog post just posted one yesterday about this very topic
Google apps are written in GWT, which comes with its own extension to JUnit. Article on unit testing ajax applications with GWT.
If you don't want to setup your own load testing server there are a couple of free online load testing services that can run load tests directly over the Internet. For example http://loadimpact.com or http://loadstorm.com
I've used Virtual User Generator, which is a part of the Loadrunner software from HP, to test AJAX applications. The software has several application protocols that can be used to record web applications, e.g. AJAX, and Click and Script.
For the majority of web application load testing it is sufficient to record and replay http requests. This will give the result of how the servers are handling the load. If your web application does a lot of asynchronous loading, and rendering on the client side, e.g. parsing large datasets of xml or json, or many DOM modifications, it can be relevant to include the browser tier to measure the end user experience.
All load testers would support AJAX- they're just additional http connections.
There are a few free ones out there- Jmeter, BadBoy, Grinder that all do it well.
All of them have some sort of support for recording/playback, but that's not always what you're looking for.
Easiest way I've done it is to record a sample session, replace a few params with variables and loop it off of a csv or excel file.
Great starting point: video of a google presentation on open source testing.
Edit: updated video link.
I've used SilkPerformer at a previous job. According to the link, they have some AJAX enhancements. Unfortunately, Silk is far from free.
Check out Jiffy. It's an end-to-end measurement suite, and is subsequently kind of complex. However, the statistics are quite impressive.
Siege? it can do HTTP testing and pass whatever you want.
You can also have a look at fwptt it is open source. If you are a .net developer you can make use of the parameter automatic handling and the possibility to use your own .net object for doing the tests.
I've successfully used JMeter to load test our Ajax (JSF/RichFaces) application. I didn't bother with JMeter's recording tool - rather I used the HttpFox plugin for Firefox to monitor what the browser is POST-ing to the server and I recreated this in JMeter.
It did get a bit complex, but the load test is now fairly robust. JMeter has all kinds of useful 'elements' to extract ID's from a web page, perform conditional logic, increment counters etc.
Better write isolated test method or API for load testing ajax application. There are some reasons:
It's not so easy to write functional tests to Ajax applications, for example for GWT.
You can use Jmeter WebDriver plugin, but for each run it starts browser which will use most of RAM and CPU.
You will load backend not frontend, so you can avoid ajax.
You can devide your testing like that: for Ajax application use Selenium or PhantomJS/CasperJS. For load testing use JMeter, Gatling via API not via Ajax.
My choice is firebug(browser addon). its very lightweight and easy to handle