Functionize performance testing – a load testing tool with realistic flows
Performance testing is a vital part of quality assurance for any modern website. You need to be confident that your site performs as users expect. You also need to test how it behaves under load. This is where performance testing tools come into play.
Load testing vs. stress testing
What is load testing?
Put simply, load testing is about seeing how your web applications or products respond when they are subjected to normal load. It seeks to answer some important questions: How does your backend react as the load increases? Does your API remain responsive? Does your database slow down? Do your load balancers do a good job? Can your servers handle the network load?
What is stress testing?
Stress testing is similar to load testing, but it is designed to push your web application beyond its expected operating conditions. During load testing, you might explore how your site reacts to 100 new sessions arriving each second. But what happens if 1,000 sessions arrive? Unless you have infinite resources, every application will fail eventually. This is about ensuring your site fails gracefully and establishing the load that triggers that failure.
What is the correct load to test?
Before starting the process of load testing you need to decide on the expected load your web applications will receive. For existing applications, you probably already know this. For a new application you need to make an educated guess. Look at similar sites and applications. Is it likely your load will follow a diurnal pattern, with peaks at predictable times of day? Will your traffic be coming from one country or many? Will user sessions be short or long?
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