Introduction to Stress Testing with an Example

Introduction to Stress Testing with an Example


When we say “stress testing”, it usually means testing a network or software by simulating heavy usage. However, it is worth remembering that stress testing can also be performed on other parts of the IT landscape. Such as systems and services to determine their resilience against failure. In this article, we will discuss some of the typical forms of stress testing. Further, it explains why they are performed to help you get started with them.

What is stress testing?

Stress testing checks if a software or system can handle heavy workloads. It’s done to see if the system is stable. It helps in evaluating the performance of a system under extreme usage conditions. Thereby helping in identifying the bottlenecks in the system.

It can be done on specific parts of the system or the whole system (by simulating thousands of users). This test is also used to determine whether a system is likely to fail under heavy loads or not.

The stress test is a dynamic process. This means that it can be performed at any point during the software development lifecycle (SDLC). It can be done on specific parts of the system or the whole system.

Need for the stress testing 

Stress testing is a way to check how well a system performs when it’s working at its busiest. It is also known as load or endurance testing. It can help determine how much activity an application can handle, and how long it can handle it.

The main objective of a stress test is to determine the limits of a system or software. It can be performed on various levels, ranging from individual components to entire systems and networks.

Types of stress testing

Stress testing is a software testing technique that is used to evaluate the performance of a system under abnormal or volatile conditions. Here are the types of stress tests as follows:

Server-client stress test

Stress testing is the process of simulating a large number of client requests to the server. This can be done by performing an attack against the server or by simulating multiple clients accessing it at once.

It is beneficial to run stress tests on your software. As it allows you to spot any weak points in your system. That will help to make necessary changes before they become dangerous.

Product stress test

The product stress test is a tool to help you identify what changes your business needs to make to improve its resilience in the face of a crisis. It can be used to assess how well your products will behave under different scenarios. Such as how long it takes for customers to pay for them or whether they break down during use.

The product stress test involves running simulations on your software and hardware using real-world data from previous customers who have purchased similar items from you. This way, you get an idea of how customers react when things go wrong. What they look like, when they contact support, etc. You’ll also learn about their expectations and behaviours. That might not be obvious at first glance. But it may affect the success of the purchase process overall.

Transaction stress test

It involves repeatedly executing transactions against the system, measuring their response time, and then comparing it to what was expected.

Transaction stress tests check how well a database performs with high traffic. This is done by running tests on multiple databases on separate servers at the same time. This helps to measure the performance of the database when a lot is happening at once. Such as when many users access an account page or make a purchase on an e-commerce store.

Systematic stress test

Repeatedly running a series of tests on the software simulating conditions that cause maximum load on the system. A systematic stress test identifies potential failures and uncovers possible issues. Like memory leaks, buffer overflows, and race conditions that the software might face.

Systematic stress testing can be used by anyone who has access to your codebase. However, it’s especially useful when multiple developers are working on an application or project (e.g., open-source projects).

Analytical stress test

Analytical stress testing is based on analytical models, which use past performance data to predict future performance. It’s used to determine how well a system will perform under different levels of stress.

Analytical models are built from historical data and then applied to the current situation to predict how an asset will perform under certain conditions at some point in the future.

For example, if you wanted to know whether your company’s website would continue performing well. Then, it was hit by a large amount of traffic during its busiest hours each month (eg. Monday through Wednesday). An analyst could build an analytical model based on previous information about how other websites have performed in similar situations. Then apply it against your own site’s current numbers to see whether there are any warning signs. That needs immediate attention before something goes wrong completely.

Metrics for stress testing

In this section, you’ll learn about metrics that can be used to measure the performance of a system under stress.

  • Mean time between failures (MTBF)- The MTBF is the average time between failures of a piece of hardware or software. It’s expressed in hours and represents how long it takes for any given system to fail once in its life cycle with an acceptable level of data loss or corruption (e.g., losing one file).
  • Mean time to failure (MTTF) – The MTTF is similar to MTBF but accounts for both hardware and software components within the overall product lifecycle; including those parts that may have been replaced over time due to obsolescence or wear-out issues.*

Stress testing tools

Stress testing tools are used to test the stability of a system under stress. The basic idea behind stress testing is that you can test how your code behaves when subjected to external forces or circumstances, such as an unexpected spike in traffic volume or changes in CPU usage.

Many tools like Apache JMeter, Gatling, LoadRunner and LoadNinja allow the simulation of a large number of users. They request transactions and generate load on a system for stress testing. They can also be used to measure the system’s response time, throughput, and other performance metrics.

For example, by sending more requests than usual and recording the time it takes for each request to complete. You can determine whether your application can handle the additional requests without slowing down too much or crashing.

Stress testing: how to do it?

Stress testing is a way to check if a system can keep working well for an extended period. It is different from regular testing which checks if the system works well under normal conditions.

One way to stress test is to add more work on top of what the system is already doing, known as overloading. For instance, if you were testing an online shop’s website and wanted a measure of how well its servers could handle multiple users logging into their accounts at once. This would involve running multiple instances with slightly different configurations. So that each has its performance characteristics measured against one another.

Stress testing: why is it relevant?

Stress testing is an important part of the software testing process. It’s used to test the capability of the system to handle a large number of users or transactions at the same time, and it’s also used to test how well your system can withstand peak loads.

Stress tests are often performed on live systems with real data, but you may find yourself using simulated stress tests instead. Stress testing is relevant as:

  • You can test multiple devices at once and get more insights into your application’s performance
  • You get to simulate real-world conditions without having actual users interacting with it
  • You can run complex models against your data sets which help you identify issues before they become larger problems down the road!

Advantages of the Stress Testing

Different methods and tools can be employed for stress testing. However, some advantages come with using them:

  • Stress testing helps uncover any areas that may impede your system’s performance when it is under heavy load.
  • It can also be used to find out the areas for improvement.
  • It determines which parts of your system need extra attention.

Disadvantages of the Stress Testing

  • Stress testing is not a replacement for unit tests.
  • Stress testing can be expensive and time-consuming, making it difficult to track and automate.
  • You might find yourself spending hours on the computer or in front of your computer screen performing stress tests. Just to find out that your code has an issue that would have been caught by unit testing.


In summary, stress testing is a way to evaluate how well a system performs when it is under a lot of pressure. This can include simulating a high number of users, requests or transactions, or putting a large amount of data on the system. There are different types of stress testing that can be done, such as testing how the system handles large amounts of data and testing how it reacts to sudden spikes in traffic. This can help identify any issues or weaknesses in the system before they become a problem. Stress testing is a method of performing load testing on an application to identify where resource utilization falls within a certain range. It involves simulating stress or load on an application to see how it performs under this condition. I hope this content is helpful to you.


What is stress testing?

Stress testing is also known as load testing or endurance testing. It’s a method of evaluating a system or an application’s performance under a heavy load. Stress testing is an important part of the testing process as it helps to identify and evaluate the system’s ability to handle unexpected and abnormal loads and conditions. It allows organizations to identify and address potential issues before they occur, resulting in improved system reliability and availability.

What are the different types of stress testing?

Stress testing can be categorized as functional or non-functional testing. Additionally, it can also be categorized by the parameters that are being measured.

There are several types of stress testing including:

  1. Load testing: This involves subjecting the system to a high level of concurrent users or transactions to determine how it performs under heavy loads.
  2. Volume testing: This is similar to load testing but it focuses on testing the system’s ability to handle large amounts of data.
  3. Stress testing: This involves subjecting the system to extreme conditions such as high loads, low resources, and other abnormal conditions to identify its breaking point.
  4. Endurance testing: This involves testing the system over an extended period of time to evaluate its performance and stability over time.
  5. Spike testing: This involves subjecting the system to sudden and extreme changes in load or resource used to evaluate its ability to handle sudden spikes in usage.

What is the main goal behind performing stress testing?

The main goal behind performing stress testing is to identify the point at which the system or application being tested will break or fail under a heavy load of traffic or usage. Stress testing simulates a high number of users, transactions or requests on the system, and measures its performance, stability and reliability under these conditions. The goal is to determine the system’s maximum capacity, as well as its behaviour and response when it approaches or exceeds that capacity. This information can be used to make improvements to the system, such as adding more resources or implementing better load balancing, to ensure that it can handle the expected levels of traffic or usage in the real world.

How stress testing is performed?

Stress testing is typically performed by creating test scenarios that simulate a heavy load on the system, and then measuring the system’s response to that load. You can also do it by simulating a large number of users, requests, or transactions, or by generating a high volume of data. This can be also done by using various tools, such as load testing software, load balancers, and other types of performance monitoring tools.

One common method for performing stress testing is to use automated testing tools to simulate a high number of users or transactions on the system. These tools can be configured to simulate different types of users and transactions, such as anonymous users or logged-in users, and can be used to measure the system’s performance, stability and reliability under different loads.

Why is stress testing important?

Stress testing is important because it helps organizations to ensure that their systems can handle the expected load and identify any issues that may need to be addressed before they become critical problems. This can help to ensure the system’s availability and performance, and can also help to avoid costly downtime or system failures. Further, it helps organizations improve the robustness and reliability of their systems, and avoid costly outages and downtime.

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