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What Is Scalability Testing All About?

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When the load testing is not passed, we will use the downward scalability testing and then start decreasing the number of users in a particular interval until the goal is achieved. The scalability testing is needed to signify the user limit for the software product. To reduce the risk of huge loss of money and the company’s reputation because of the bad performance of an application, it is very important to do rigorous Scalability testing before releasing it in a production environment. Vertical Scaling involves increasing the power of already existing machines either in CPU, RAM, Disk to the server. For example, before when the work is handled by 1 CPU, due to an increase in load, the performance of the system starts degrading, for this in spite of using 1 CPU, the number of CPUs has been increased in the single server. If the requirement of memory is increased from 4GB to 16 GB to maintain the good performance of the system or the disk size is increased from the existing size, vertical scaling is done.

Scalability testing

For example, removing dead code in the product and reducing thread usage. One of the best practices to minimize CPU usage are sleep methods. Threshold Load − It is the number of requests processed by the software product withthe expected throughput.

Vertical Vs Horizontal Scaling

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Scalability testing

In the case of horizontal scaling , a new server to share the load with the incumbent would be introduced to the network. This is a quick way to double or better the performance and capacity of your infrastructure. An option to improve capacity and processing speed before increasing load is to add components to your infrastructure. This could be in the form of installing better processors to the same racks that host your applications.

Find out if your software solution provides an engaging user experience. We’ve seen small projects explode in popularity and large enterprise suites easily handle corporate mergers. Threshold load is the number of requests or transactions the application can process with desired throughput. To determine client-side degradation and end user experience under load. If you read every word above as it was meant, you should be ready with enough of the talk to do the walk.

Also, since these are data-driven tests, you need to make sure all varying data has been defined and implemented in the process. Additionally, Tech Beacon has an impressive list of 12 open source performance testing tools. Blaze Meter also has a detailed comparison between popular performance testing tools like Gatling, Tsung, JMeter and the Grinder. Scalability testing should help you accurately project how changes in hardware and software will impact your server performance. That way you can gauge whether or not investing in upgrades is really worth it.

The Importance Of Scalability

It ensures that a software product can manage the scheduled increase in user traffic, data volume, transaction counts frequency and many other things. It tests the system, processes or databases ability to meet a growing need. In this testing, the performance of the software product under testing is measured in terms of its capability to scale up or scale down the number of user request load and other performance attributes. The purpose of performing scalability testing is to ensure that the product has enough capabilities to handle an estimated increase in user traffic, data load, transaction counts frequency, etc. It basically tests the ability of the system to meet the growing demands. Scalability testing can be done at hardware, software and database level.

  • It is used to check an application’s performance by increasing or decreasing the load in particular scales known as scalability testing.
  • By determining the server-side robustness and client-side degradation, the organization can then take the required measures to create the best user experience while optimizing infrastructure costs.
  • Memory usage − It is the measure of the memory consumed by the software product while performing a task.
  • With all the knowledge you’ve been equipped with, it only makes sense that you know how to get started with the process of scalability testing.
  • Testers need a test tool which can handle load factor under various scenarios created.
  • For example, in case the storage space available for a specified number of users exceeds memory, developers will then be compelled to add additional database storage to compensate data losses.
  • Horizontal Scaling involves adding more physical machines and resources and hence reducing the load on each machine/ resource.

IBM has a terrific guide to designing performance tests with more details. Bringing in a new server to share the workload with your current server is scaling out. The success of a software project depends, among other things, on whether it’s the right fit for the industry it’s in. And that is true not just for the development stage, but also for QA. Different industry have different software requirements, and our team knows all about them. Software is everywhere around us, and it’s essential for your testing team to be familiar with all the various types and platforms software can come with.

Features Of Scalability Testing

Scalability testing ensures the developers that the application is ready to be released and available to the customers. Scalability refers to the capacity of a network, system or process to adapt to sudden changes. Applications must be able to handle large increases in simultaneous users, data volume and other workloads. Scalability tests provide a way to simulate different scenarios to ensure that your application is ready for any situation.

Cloud or on-premise, it is possible to scale vertically by allocating more space to the same servers. The load is the moving variable when conducting most of the tests above. Small loads will provide a standard, or starting measure, of performance. As the load increases, taking logs of how every other resource is affected, along with mitigation measures to attain stability, will be useful.

Scalability testing

The environment should be constant throughout testing in order to provide accurate and reliable results. If the testing is a success, we should see a proportional change in performance. For example, if we double the users on the system, we should see a drop in performance of 50%. That way, you can spend your working hours analyzing the tests that were conducted during off-hours.

The Five Steps Of Scalability Testing

Later, you can apply the data gained from testing to improve your application performance metrics and boost customer experience. In the real world, it is very important to test the scalability of the system before it is released in the Production environment. Applications must be able to cope with the different scenarios of a large number of user requests, data volume, and other workloads.

Generally, it involves set of load tests with different settings of hardware and software, keeping test environment unchanged. Offload your database by limiting open connections and transactions. However, don’t go overboard loading everything into the app layer, or else you could face other performance issues. Pick a repeatable process for conducting your scalability tests during the application’s lifecycle. If you’re building a new web application, you have no way of knowing the number of simultaneous users you’ll have years from now. Although you obviously want your project to be as successful as possible, your problems could multiply as you gain users.

Test Strategy for Scalability Testing differ in terms of the type of application is being tested. If an application accesses a database, testing parameters will be testing the size of the database in relation to the number of users and so on. Screen transition means the ability of the system to transition from a single interface to another one across all possible devices. If during the testing phase you detect that the transition takes longer than it should, your code probably needs to be optimized.

This will allow you to create a long-term development strategy for your product and make the right choice between expanding your functionality or building the foundation for future growth. Findings from your scalability tests often lead to improvements in the application and the resources around it. There are two ways you can scale the infrastructure around your applications; vertical or horizontal. In order to simulate the loads on your network and applications, provide the testing agent with enough storage and processing resources.

Project Execution

What you need to accept at this point is that scalability tests, unlike load tests, consider the max and min performance attributes of a system. Load tests will just seek to find levels of pressure under which a system folds. Scale, a word that has to do with size, and ability, another word that gets you thinking if an event is possible or not. We could stop right here and have you doing some scalability testing, but there’s much more to it than knowing the term’s meaning. Regardless of how good looking a system is, it could still fail scalability tests! You see, the tests in this variety of analyses have nothing to do with form and feature.

In this testing, the Test Cases are designed and implemented in a well-organized manner. It also analysis the system, processes, or database’s ability to meet an upward need. Now almost all the companies have added Scalability vs Elasticity as a part of their testing process. Scalability testing requires a separate team of professionals and tester who have complete knowledge of the system and have strong analytical skills. There is a high demand for people in the market for Scalability testing and companies are ready to offer handsome packages to professionals.

After a scalability test, you find out that your app can take a load of up to 15,000 users. In some cases, there may be changes that have to be made to the server software or hardware. Once the necessary upgrades have been made, we must re-run the tests to ensure the upgrades have been effective in addressing the issues previously raised. In figure 2, we can see a more proportional increase, comparing the number of users to the time taken to execute a report.

Some of its major disadvantage includes its storage restriction, database size limits, network bandwidth limitations, and the buffer space. In this section, we are going to understand scalability testing, which checks the performance of an application by increasing or decreasing the load in particular scales like number of a user. It uncovers the exact cause of various performance issues in an application in the testing phase only which saves a lot of time and money if detected in the production environment.

Network Usage

Scalability testing tests the product’s ability to perform the function correctly with changes in size of the system. Throughput − It is the measure of the number of requests processed per unit time, by the software product. For example, in web applications throughput is measured in terms of user requests processed per unit time. On the other hand, throughput is a database application is measure in terms of the number of queries processed per unit time by the application. A software product is scalable provided that it delivers the same throughput for different levels of load on the internal applications, hardware or database.

Memory usage − It is the measure of the memory consumed by the software product while performing a task. A software product is considered scalable if it uses as much less memory as possible. Some of the best programming practices to reduce memory usage are avoiding the use of redundant loops, reducing the hits to the database, using cache, optimizing the usage of SQL queries, etc.

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