Any product before its launch in the market is subjected to numerous tests. These tests aim to explore product behavior and performance level under different possible demand scenarios and provide feedback for the development of a robust product. Likewise, the process of software development also involves the use of different tests including regression testing, integration testing, load testing, and so on.
Each of these tests involves a specific procedure to check specific parameters. While regression testing looks into the effect of modifications on software, integration testing looks into the interaction of software and hardware components, and load testing checks the software’s capacity to handle the actual demand of an inflated number of end users.
In definitional terms, load testing is the process of subjecting a computer, peripheral, server, network, or application to a work level approaching the limits of its specifications. One of the primary tests, load testing is a part of a more general process known as performance testing, which assesses the speed and effectiveness of the application to generate results within a specified time.
Load testing is the simplest form of performance testing. During load testing, the software application or IT system is subjected to ordinary stress in order to confirm if it can perform as intended under normal conditions. It is different from stress testing, where the system is overloaded till it breaks by applying unrealistic or unlikely load scenarios, and soak testing which is used to determine if the system can sustain the continuous expected load.
However, a load test becomes a stress test if the application fails to perform even on the expected load. The Microsoft Performance Testing Guidance for Web Applications states in this regard: “A load test enables you to measure response times, throughput rates, and resource-utilization levels, and to identify your application’s breaking point, assuming that the breaking point occurs below the peak load condition.”
Primarily, load testing is conducted to understand the behavior of the application under a specific expected load. It provides the means to confirm whether the application or software would serve the end users satisfactorily and if not then bottlenecks and elements causing degradation.
To cite an example, as per statista.com, global e-commerce is expected to generate a revenue of USD 2.3 trillion by 2018. All the transactions would be carried out through various applications where most of the time multiple users would be engaged in buying and selling from the same application. The success of such a model depends on reliable, stable, and cost-effective web-based applications. The only means to check whether the application is able to service such multiple users and is stable in behavior is through efficient load testing where each scenario is checked.
As already discussed, the basic purpose of load testing is to determine the application’s behavior under both normal and anticipated load conditions. The following steps can be implemented to optimize the process of load testing:
Input Parameters:
Based on the above approach, a number of input parameters can be identified:
Output Parameters:
The success of any application depends on its performance and response time when multiple users utilize the application at the same time. An application with high response time and poor performance deters users and consequently would be unsuccessful.