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
Related
I am trying to find information in Chrome DevTools, which will show me how much it really took the browser to get a response from the server, and how much to display it to the user - just want to separate these two values.
I am trying to find the answer in the DevTools Performance and Network - Timing tab.
After analyzing, I concluded that the value I'm looking for is TTFB, but I'm not convinced.
Maybe the value I am looking for is the Content Download in the Network -> Timing?
Thanks in advance.
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 understand that the primary use of Jmeter is not finding the load time of a page. However, I'd like to know if there's any tool for the below scenario to calculate the approximate load time of a page (barring the rendering time):
Calculate the response time of various web requests for a particular page P1 using JMeter
Record and save the web request pattern of the page P1 in the desired browser
A tool replaces every web request in the pattern with the response time recorded in Step 1 and based on the timeline slice in Step 2, gives us the load time of the given page P1
Hope I'm making sense
Actually the answer lives at JMeter Home Page
JMeter is not a browser. 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 viewed at a time)
You don't need to do anything as JMeter doesn't actually render page. You may want to perform some tweaks to make it behave more like a real browser, especially HTTP Cache Manager matters.
In regards to saving browser traffic - for Chromium and derivatives you can do it right from Developer Tools by right-clicking a request in Network tab
My Page has multiple portlet. Each portlet displays data asynchronously using AJAX. Can JMeter help me here. There are many posts in internet which doesn't clearly state if this is possible or not.
I read an interesting post where someone suggested that AJAX requests can be captured and total time can be derived by using a Transaction controller. But at other side someone mentions AJAX requests can never be captured.
So would like to check here and see if any of JMeter gurus can shed light on this one.
I am not a JMeter Guru! But i can understand the issue you are facing now.
AJAX requests are HTTP requests & so it can be captured with JMeter. (I know I have done). As they say Transaction controller will give the total time of the transaction . ie - If you place 4 http requests / AJAX requests under a transaction controller - it will give you the total time of all those 4 requests.
But the issue is - JMeter will call these AJAX/HTTP requests sequentially. But, your browser might make these calls in parallel (depends on your application). In that case - The time you get with JMeter might NOT be correct.
JMeter is not a correct tool to measure Browser's page load time. If you are not aware - it does not execute any javascript. But your browser does. So actual browser page load time might be different.
The parallel request issue can be easily dealt with though.
You can use a thread group in jmeter which has as many parallel threads as your browser has parallel requests.
Therefore, though it is surely not an accurate measurement of the time a browser would need, I can see a few applications for this approach.
If the browser loading pattern is modelled closely enough we should be able to collect some useful results which closely correlate to the timing figures we are looking for.
When I make HTTP Request in JMeter I get Response data like "This page uses JavaScript and requires a JavaScript enabled browser." How is it possible to fix this problem.
JMeter is not a browser, and does not interpret the JavaScript in downloaded pages.
From the JMeter wiki:
JMeter does not process Javascript or applets embedded in HTML pages.
JMeter can download the relevant resources (some embedded resources
are downloaded automatically if the correct options are set), but it
does not process the HTML and execute any Javascript functions.
If the page uses Javascript to build up a URL or submit a form, you
can use the Proxy Recording facility to create the necessary sampler.
If this is not possible, then manual inspection of the code may be
needed to determine what the Javascript is doing.
Depending on what you are doing, you could create an execution test using Selenium IDE for Firefox. The test will run in your browser so the JavaScript will also run. Note though that I never used Selenium as a substitute for JMeter and don't know about common features to both the tools.
I suppose you can use the WebDriver plugin to run real browser tests (IE/Firefox/Chrome/Selenium).
There is good documentation here
You can add WebDriver to JMeter test to fully evaluate the page rendering.
Web Driver Sampler automates the execution and collection of
Performance metrics on the Browser (client-side). A large part of
performance testing, up to this point, has been on the server side of
things. However, with the advancement of technology, HTML5, JS and CSS
improvements, more and more logic and behaviour have been pushed down
to the client. This adds to the overall perceived performance of
website/webapp, but this metric is not available in JMeter. Things
that add to the overall browser execution time may include:
Client-side Javascript execution - eg. AJAX, JS templates
CSS transforms - eg. 3D matrix transforms, animations
3rd party plugins - eg. Facebook like, Double click ads, site analytics, etc
All these things add to the overall browser execution time, and this
project aims to measure the time it takes to complete rendering all
this content.
Official guide: https://jmeter-plugins.org/wiki/WebDriverTutorial/
You need to add HTTP Cookie/Cache Manager to your thread in order to solve this.