Load Testing - Web Performance

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Showing posts tagged “Load Testing”

Load Tester PRO 5.3 Released

Web Performance Inc is proud to release Load Tester PRO/LITE 5.3, which focuses on usability. The biggest change you’ll notice is the completely redesigned test case table, with inline editing, undo, drag and drop, multi-select, and new replay layout. Drag and drop works with either individual transactions or entire web pages, and as you play with the new widget notice details such as inline editing and customizable table columns. Select a series of web pages or transactions, and right-click to edit think times or page load time goals. The new table is also customizable; right-click on … Continue reading »

Load Testing a Website with Captcha

More and more sites are having to add captcha security to thwart spam bots, making this a familiar sight:

But what happens when you need to do performance testing on such a site? One common question on our support line is how to configure a load testing tool to read the displayed text and type it in. The whole point of adding captcha security is to prevent an automated tool from accessing the website, so if it was easily bypassed by a load testing tool, then spammers could also use that same technique to access your website!
There … Continue reading »

Load Testing an Javascript or AJAX Application

Most of us are relieved that web applications are starting to behave more like desktop applications – i.e. smarter and easier to use. A little wow factor here and there doesn’t hurt either. Ease of use always has a cost, so it should come as no surprise that the AJAX applications are more difficult to develop. But you may be surprised that they can also be more difficult to load test.
The reason is fairly simple. Traditional web applications are relatively easy to model and simulate. The state of a user session, at any given time, is a combination of the … Continue reading »

Load Tester PRO™ 5.1 Released

Fast on the heels of the initial 5.0 PRO release, 5.1 is a major upgrade that includes support for mobile load testing, a completely resigned load test design and control system, improved support for dynamically scalable websites, Internet Explorer 10 support, and portal license manager integration.
Mobile Load Testing
The increasing web traffic from mobile devices has been noticed for years, but how much does it really affect a website? A recent study shows that 7% of web traffic is from mobile devices, which includes both phones and tablets. Because these devices use different browsers, and sometimes access different versions of a … Continue reading »

Load Test Early!

Customers occasionally ask us “How early should we begin load testing?”
The answer is to test something, anything, as soon as the architecture is available. Performance problems have a wide variety of causes – from a single line of code to a load balancer setup; from a database schema to a server config file. Early in the development of the software you can catch simple coding problems and fundamental architectural limitations that are much easier to fix before a lot of code has been written.
Now, a word of caution: Testing against a scaled-down development or … Continue reading »

Performance Starts with the Developers

Performance starts with the developers  as well as the server and network administrators. High-capacity websites do not happen by accident. To perform well and scale big, the system must be designed, built and configured for performance. That means it must be coded and configured with performance in mind, right from the start. Make sure the developer and admins all understand the levels to which the system must perform. Don’t make them guess what “it has to be fast” means.
Two of the most important tasks the test and project management teams to can do to help:

Identify the performance goals for the … Continue reading »

Javascript/JSON Support in Load Tester 4.3

Over the last year, Web Performance engineers have been working to make Load Tester smarter and easier to configure.  Load Tester 4.2 introduced the new Fields View, which allows test case developers to write out HTTP requests using a flexible and composable assortment of data sources.
Starting with Load Tester 4.3, Load Tester will automatically recognize JSON content in any HTTP request.  As a consequence, each JSON element will become a configurable name-value pair field in the Fields View.  We believe this will make it much easier to configure complex AJAX and RESTful style test cases.

Furthermore, whenever Load Tester’s Application … Continue reading »

How much bandwidth can we expect from cloud engines during a load test?

I got into a discussion in the Performance Testing group on LinkedIn which raised a question that we had answered internally, but had neglected to share with our customers – how much bandwidth do our cloud engines have available?
Before I proceed, I must make this disclaimer: our cloud engines run on Amazon’s EC2 infrastructure, so the rules that apply there also apply to our cloud engines. Amazon does not make any guarantees for bandwidth, so anytime your test results look suspicious, we recommend doing a quick bandwidth test. Note that there is a Bandwidth Test wizard in Load … Continue reading »

How HTTP Authentication works and why load testers should care

The most commonly used authentication method for websites is a login form on a web page. We’ve all seen them – enter your username and password into fields on the web page and press the Submit or Login button. From the standpoint of the underlying technology, this is no different than submitting any other form – only the names of the fields distinguish them as login or password fields and the security mechanism is implemented within the web application.

Web Performance Consulting

Our experts … Continue reading »

Load Testing Data Population: How Many Rows?

A common problem when setting up a load testing configuration in Load Tester is figuring out how many rows of data you need for a particular test.  For example, you need to have a set of user names and passwords to be used during the test, but how many do you need to ensure that the test will complete?
To answer this question, you need to know three things: the duration of the test, the expected duration of the test case, and how many concurrent users the test will simulate.  Fortunately, these things are usually easy to determine.  The test duration … Continue reading »


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