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How to calculate maximum number of concurrent users using littile law formula

When load testing an application, the first set of tests should focus on measuring the maximum throughput. This is especially true of multi-user, interactive applications like web applications. The maximum throughput is best measured by running a few emulated users with zero think time. This means that each emulated user sends a request, receives a response and immediately loops back to send the next request. Although this is artificial, it is the best way to quickly determine the maximum performance of the server infrastructure. Littile Law: Once you have that throughput (say X), we can use  Little’s Law  to estimate the number of real simultaneous users that the application can support. In simple terms, Little’s Law states that : N = X  / λ where N is the number of concurrent users,  λ is the average arrival rate and X is the throughput. Note that the arrival rate is the inverse of the inter-arrival time i.e. the time between requests. To under...
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Singleton Design Pattern using Page Factory

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n this tutorial, We will learn about the  Framework Design Pattern using singleton class  in Selenium. In the Previous tutorial we have seen, How can we run the Test using Page Factory. Now question is, Will we repeat the Browser invoke and Logger code again and again in each and every Test. No, To resolve this issue we will use the Singleton Pattern. We will design the Single  Test Base  class.  First, Let's see what is  Singleton Pattern .  With the Singleton design pattern you can: Ensure that only one instance of a class is created Provide a global point of access to the object In  TestBase  class, we will Design the Singleton Pattern, We will write the command code here and all Test Classes will inherit this  TestBase  class.  n previous Example, we have seen we were invoking  WebDriver   instance  in each @Test. Here, We will Implement the WebDriver initializat...
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Workload Modeling and Profiles for Load Testing

Any  load testin g  project should start with the development of a model for user workload that an application receives. This should take into consideration various performance aspects of the application and the infrastructure that a given workload will impact. A workload profile is a key component of such a model. Depending on the type and goals of a load test, one or more profiles may be appropriate. Choosing the workload profiles representative of anticipated real load over time (whether it is an everyday usage scenario or a high peak) results in more accurate answers to the “main questions of load testing” such as, “Will my site support N users performing a search at the same time?” and “What is the highest number of users that my site will support – while remaining within specified quality and performance guidelines?” Workload modeling identifies one or more workload profiles to be simulated against the tested application. The workload model then attempts to approxima...
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