What is Performance Testing?
Performance testing is done to evaluate how a system under test performs in terms of responsiveness and stability under a particular workload. Performance tests are typically executed to examine speed, robustness, reliability, and application size.
It checks for browser or page and network response times, Server request processing times, concurrent user, CPU memory consumption.
The Standard of an application is set in respect of various attributes like speed, response time, throughput, resource usage, and stability which are tested in a performance test.
Types of performance testing
Load Testing: Load testing verifies the system or application behavior under normal and peak load conditions. It is tested by increasing the load on the system, which means an increasing number of concurrent users, transactions & check the behavior of the application under test. The main purpose of load testing is to check the amount of load that can withstand the application under test and monitors the response time.
Stress Testing: Stress testing verifies the system or application behavior when the load on the system exceeds the upper limit capacity of the system. It checks the stability of software when hardware resources are not sufficient like CPU, memory, disk space. The objective is to determine the system behavior under the most uncertain scenarios.
Volume Testing: Volume testing verifies the system or application behavior when a large volume of data is processed to check the efficiency of the system. The objective of volume testing is to monitor the performance of the application under varying databases volume.
Spike Testing: Spike testing verifies the system or application behavior when there is a sudden increase in the load on the system. The main goal is to verify if the system will be able to sustain the sudden increase in workload. It is a subset of stress testing.
Endurance Testing: It is also known as Soak testing. It verifies if the system is capable of handling the expected load over a long period of time. The testing is done with the expected amount of load but over a longer period of time. During soak tests, memory utilization is monitored to determine memory leaks or other performance issues.
Scalability Testing: It verifies the ability of the software to effectively handle an increasing workload.
Why do we need Performance Testing?
- Performance testing informs the stakeholders about the speed, scalability, and stability of the application.
- It identifies the necessary improvements that need to be incorporated before the product is released in the market.
- Performance Testing also checks that the application shouldn’t get slow while multiple users are using it simultaneously.
- It also checks the inconsistency across different operating systems.
Common Performance Problems
Long Load time – Load time refers to the initial time, which takes by an application to load or become responsive. The problem with some of the applications is the longer load which makes a very much negative impact on the user.
Poor response time – Response time is the time takes by an application to provide the response output of the user input data into the application. If the application has poor response time, which means if it takes a longer time to provide a response then this makes the user wait too long, and eventually, they lose interest.
Bottlenecking — Bottlenecking refers to an interruption of data flow because the system doesn’t have enough capacity to handle the workload. It degrades overall system performance.
Poor scalability — If the software is incapable of handling the desired number of concurrent tasks then response time could get delayed and chances of error occurrence get an increase, or other unexpected behavior could happen which may affect the following factor:
- Disk usage
- CPU usage
- Memory leaks
- Operating system limitations
- Poor network configuration
Performance testing tools
There are various tools available in the market using which we can perform performance testing such as Apache JMeter, Blazemeter, Load Runner, WebLOAD, etc.