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What are the performance test interview questions in software testing

2025-01-29 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >

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This article mainly introduces the software test in the performance test interview questions have what related knowledge, detailed and easy to understand, simple and fast operation, has a certain reference value, I believe that everyone will read this software test in the performance test interview questions which articles will have some harvest, let's take a look at it together.

1. What are the common performance test methods? What's an example?

1. Load test

Load testing here refers to the most common performance testing performed to verify general performance requirements. We mentioned above that the most common performance requirement of users is "both horse running and horse eating less grass." Therefore, load testing is mainly to examine the performance of software systems under a given load. We can understand load testing as follows:

(1) Load testing is to observe the performance of the software system under certain conditions from the user's point of view.

(2) The expected outcome of load testing is that the user's performance requirements are met. This indicator is generally reflected in response time, transaction capacity, concurrent capacity, resource utilization, etc.

2. Pressure test

Stress testing is to examine the performance of the system under ** conditions, which can be overloaded transaction volume and number of concurrent users. Note that this ** condition is not necessarily the user's performance requirements, and may be much higher than the user's performance requirements. Stress testing differs from load testing in that the expected outcome of stress testing is that the system has a problem, whereas we are looking at how the system handles the problem. For example, we expect a system to remain stable under stress, slow down but not collapse. Therefore, stress testing allows us to identify weaknesses in the system and how the program will behave under extreme loads. Example: Load testing is concerned with user rules and requirements, stress testing is concerned with the software system itself.

3. concurrent test

Verify the concurrency capability of the system. Generally, a large number of concurrent connections are established with the server side, and whether the system achieves the established concurrency capability index is judged by the response time of the client side and the performance monitoring of the server side. Concurrency is often used in load testing to create load, so concurrency testing is presented separately because concurrency testing often involves the concurrency capacity of the server and the problems that may arise from multi-process/multi-thread coordination synchronization. This is something that needs special attention and testing.

4. benchmarking

When a new module is added to a software system, benchmarks are needed to determine the performance impact of the new module on the entire software system. Benchmarking requires at least one test to open/close the new module. Each performance index of the system before closing the module is recorded as a benchmark, and then compared with the performance index of the system when the module is opened to judge the impact of the module on the system performance.

5. stability test

"Road remote know horsepower," here we want to talk about and performance test related stability test, that is, test whether the system will have problems after running for a long time under certain load. Some problems in software systems cannot be exposed at once, or take time to accumulate to a measurable extent. Why would you need such a test? Because some software problems are only exposed after running for a day or a week or more. This problem is generally caused by programs that occupy resources but cannot be released in time. For example, the memory leak problem is that it will gradually become significant after a period of accumulation, but it is difficult to detect it in the early stage of operation; there are clients and servers that have established a large number of connection paths after running for a period of time, but they cannot be effectively reused or released in time.

6. recoverable test

Test whether the system can quickly recover from the error state to the normal state. For example, in a system equipped with Load Balancer, if the host is stressed and unable to function properly, whether the backup machine can quickly take over the load. Recoverability testing is usually done in conjunction with stress testing.

What do you think is the purpose of performance testing? What is the key to good performance testing?

Performance testing, which checks whether the system meets the performance requirements specified in the requirements specification, is often combined with strength testing and often requires both software and hardware testing. Performance testing focuses primarily on response time, throughput, memory footprint (secondary storage), and processing accuracy.

From what point of view do server-side performance analysis be carried out?

Divided from dimensions, performance indicators are mainly divided into two categories: service performance indicators and system resource performance indicators. Business performance indicators can intuitively reflect the actual performance status of the system under test. Common indicators include:

1. number of concurrent users

Transaction throughput (TPS/RPS)

3. Average transaction response time

4. Transaction success rate System resource performance indicators, mainly reflecting the use of hardware resources in the entire system environment, commonly used indicators include:

Server: CPU utilization, processor queue length, memory utilization, memory swap pages, disk IO status, network card bandwidth usage, etc.;

Database: database connection number, database read-write response time, database read-write throughput, etc.;

Network: network throughput, network bandwidth, network buffer pool size;

Cache (Redis): static resource cache hit rate, dynamic data cache hit rate, cache throughput, etc.;

. Test equipment (stress generator): CPU utilization, processor queue length, memory utilization, memory swap pages, disk IO status, network card bandwidth usage, etc.

How do you understand stress testing, load testing, and performance testing?

Performance Test: Usually collects all the performance related to the test and is used by different people in different situations. Stress test: It is the impact of long-term continuous operation of the system on system performance under certain load conditions. Load test: Under a certain workload, the load caused to the system and the response time of the system.

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