
The advancement of modern technology has meant that consumers have far more choice than ever before when it comes to utilising applications and technology. As a result, consumers are becoming increasingly selective of which applications they use.
The ability for your application to scale has become an absolutely vital component of any new technology. Applications that fail under increasing workload will face a rapid backlash from end users as they look to the competition for alternative solutions. An inability to scale with increasing workload can damage the brand reputation of an organisation and see potential customers turn away very quickly. Essentially, if your application cannot scale effectively with increasing workload, your organisation’s profit margins may be affected.
This article goes into detail about the basics of scalability and how testing assists in understanding application performance. Application testing is a pivotal part of measuring performance and can provide organisations with peace of mind that applications can handle growth and scalability with aplomb. Testpoint specialise in application performance management and load testing with its Vansah technology platform to ensure that your software can always perform at an optimum level[i].
Scalability testing
From the outside, many organisations view scalability testing as an intimidating task. However, testing an application for its ability to scale is actually a lot more straightforward than you may think. Essentially testers place an application under stress and establish where the limit of scalability is reached. Once the limit has been determined, it is important to find out why the limit has been reached, so an application can handle an increased workload.
From the testers point of view there are a number of things that can affect an application’s ability to scale:
Testing for scalability is trying to understand how to maximise the performance of an application for end users. Testing these factors collectively and measuring their performance against a high workload provide an insight to an application’s scalability.
Why is scalability crucial?
Scalability refers to the ability of an application to respond to quick fluctuations of load, traffic, data and end users. Importantly, scalability also refers to how an application can handle an increase in these different aspects simultaneously. Often, in times of increased workload there is an increase in end users, data and traffic that places load on an application.
Scalability testing measures how your application will gauge against these fluctuations. Each application is different and testing must be tailored to suit the particular requirements of the application and the users that it serves. It is vitally important that organisations put steps in place that give your application the ability to scale efficiently during these increases. Scalability testing replicates spikes in workload and allows testers to measure the performance of an application under a variety of situations.
SMART Scalability testing
In an ideal world an application will run seamlessly for every user under all conditions. However, this utopia is not always possible to achieve. Therefore, it is important when it comes to scalability that SMART goals are identified early to help measure performance and understand what scalability will look like for your application:
Incremental testing
Once you understand the parameters of testing for scalability, it is also vitally important to test incrementally. If you have a new application it is very difficult to ascertain how many users may be using your application simultaneously. Incremental testing will help you safeguard your application from problems exacerbating if the workload increases exponentially. Incremental testing places the application under strain with different loads. A small load test should give an indication of how an application performs normally.
Increasing the load incrementally then gives an indication of how the application performs against this normal base measure. The first sign of issues will pave the way for scalability solutions. Often different amounts of duress create different scalability issues. Testing at all levels of loading will allow you to be across all possible problems you may encounter, so that your application can perform well during peak times.
Horizontal or Vertical Scaling?
It is important to understand the type of scalability you would like your application to achieve. There are two distinct ways to scale an application:
How Scalability testing assists in understanding performance
An application’s loading time can make or break its success. Consumers now expect an application to load within two seconds[ii]. Scalability testing throughout the application’s production lifecycle can help testers and developers create application architecture that can handle a growing workload.
All businesses want their organisations to grow and with that is an expectation that their applications will handle this growth. As the workloads increase, the complexity of scalability also increases. Testing at high workloads creates an understanding of how an application can operate under duress and allows testers and developers to scale components of the application, either horizontally or vertically, for optimum performance. Scalability testing allows testers to maximise performance and tailor capacity to handle demand[iii].
Create a Scalability Checklist
It is important to understand how the testing process can assist in understanding performance. By having a clearly defined scalability checklist it is possible to get the most out of your performance testing:
Outsourcing your scalability testing
Creating an application is one thing. However, making an application scalable is an entirely different proposition. Improving and increasing scalability can soak up a lot of resources and can become a costly exercise without the right level of expertise. If your organisation is light on experience it is a great idea to outsource your scalability testing. This is particularly pertinent, when you are unsure about elements of scalability testing or you are unsure about the workload your application may have to handle.
Testpoint specialise in Scalability/Load testing to help you and your organisation create applications that can perform optimally all the time. Making your application scalable under increasing workload is crucial to maintain brand reputation and ensure that end users are satisfied with the speed and efficiency of your applications.
[i] Testpoint, Software Testing Services, https://www.testpoint.com.au/solutions-services/software-testing/
[ii] Romexsoft, ‘How to increase the scalability of a web application’, (2017), https://www.romexsoft.com/blog/improve-scalability/
[iii] Testpoint, ‘The Benefits of Performance Testing’, (2017), https://testpoint.com.au/the-benefits-of-performance-testing/