Shulou(Shulou.com)06/02 Report--

Stress testing is an important part of any web-based application testing. It helps us determine the performance of the system under normal and expected peak load conditions. It also helps to determine the maximum operating capacity of the application, potential bottlenecks, and factors that may lead to performance degradation.

Normal Load Testing

This type of test simulates typical user behavior over a short period of time, such as an hour. Regular load testing is the most basic; it assumes normal daily usage for a limited period of time to check that the application will run as expected.

Most developers and testers run these types of tests on their web and mobile applications. But if you run only these types of tests, you ignore two key types of load tests, which can identify broader and deeper problems.

1.Soak Testing (immersion test)

Immersion test means that the system will run continuously under a certain load for a period of time to check the general performance of the system. The main advantage of the immersion test is that it reveals:

1. A serious memory leak will eventually cause the application or operating system to crash

two。 Unable to close the connection between different layers or modules of the system, which may cause the application to crash

3. Hierarchical degradation of response time-during long tests or long sessions, applications tend to become less efficient because it processes more requests, log file sizes increase, more data is pushed into the system, and so on.

However, immersion testing and understanding subsequent reports are more complex, and it requires developers to participate in the analysis of the data.

2.Stress Testing

Stress tests try to identify points of failure in specific system components and are more likely to create bottlenecks or failures by setting unusually high loads on the system. Stress testing is important if you have a specific module or operation that is critical to your application and need to identify potential breakpoints or bottlenecks.

For example, the home page usually gets the maximum number of visits, so you will pressurize it to see when it will hang up. Another example might be the checkout page on an e-commerce site. You will create a large number of users to access it, and if this page crashes, it will destroy most of the system.

Load Testing Implementation

Before implementing load testing for your application, you need to understand the behavior of application users and related business scenarios.

For regular load tests, you will load a normal number of users with a medium ramp-up time. For example: one hour of testing, 10 minutes of ramp-up. For immersion testing, you need to set up a slower ramp-up when you want to see more data about memory leaks and connections between tiers, as well as more resolution for application performance. For example, for a 3-4 hour immersion test, you can set a ramp-up time of 45 minutes. This will enable you to see any degradation or minor bottlenecks that occur. Setting the ramp-down time is also important in the immersion test. In BlazeMeter, ramp-down is the time it takes to kill a user until it reaches zero.

For immersion testing, it is important to have a slow ramp-down time to see changes in memory usage as the number of users decreases. For example, there is no correlation between the number of users and memory usage, indicating memory leaks or other problems.

For stress testing, you don't know where the application will crash, so as a rule of thumb, multiply the number of normal users by two and apply fast ramp-up time to identify the break point. If it does not crash, adjust the ramp-up time and repeat the test to find the collapse point.

The final suggestion

It is important to include all of the above types in load test planning and preparation. Ideally, you can start with a normal load test to see the general performance behavior of the application. Then run an immersion test to determine how your system will respond to continuous use. All of this, constantly implemented, to fix your code to stabilize your application. Once completed, the stress tests will play a role in ensuring that your application is ready to implement the requirements.

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