What is Load Testing? What is Performance Testing?

The following is a scattered piece of information on the Internet, which I have compiled.

Performance testing. or multi-user concurrent performance testing), load testing, strength testing, and capacity testing are a few aspects of performance testing, but the concepts are easy to confuse. Here are a few concepts.

Performance Testing

test): Usually collects all the performance related to the test, and is usually used by different people in different situations.

Concern: How

much and how

fast load test (load

test): Load testing is a performance test that refers to whether the program can afford the data running in an overloaded environment.

Concern: How

Much Strength Test (stress

test）：

Strength testing is a kind of performance test, in which he works in the case of a particularly low system resource, in order to find out where the system fails and how. Include.

SpikeTesting: Extreme load testing for short periods of time.

extreme

testing: load testing under an overcrowd of users.

hammer

testing: Perform all possible operations consecutively.

Capacity test (volume

Concern: How

much (not how.)

fast) capacity testing, usually related to databases, the difference between capacity and load is that capacity focuses on large capacity, and does not need to represent actual usage.

Among them, the English interpretation of capacity test, load test, and strength test is:

volume

testing

largeamounts

ofdata

loadtesting

largeamount

ofusers

stress

testing

toomany

users,too

muchdata,too

little

timeand

toolittle

Room may be confusing with character performance testing, load testing, and strength testing. That's right, these three concepts are relatively confusing. Load testing and strength testing are both subsets of performance testing. Let's take an example of running to explain.

Performance testing, which represents the best case that can be performed on a given benchmark. For example, how much time do you need to run 100 meters without weights (here, no weights are the benchmark)?

Load test, also performance test, but he is under different loads. For the example just now, if you expand to: in 50 kg, 100 kg ......How much time do you need to run 100 meters?

Strength test is a performance test under the condition of strength. For the example, how long does it take you to run 100 meters with or without weights in a gust of wind?

The main differences are that the nature, purpose and characteristics are different, as follows:

First, the nature is different.

1. Stress test.

Stress testing is a test under heavy load (large data volume, large number of concurrent users, etc.) to check the operation behavior of the application system under peak usage conditions, so as to effectively find a hidden function of the system and whether the system has good fault tolerance and recoverability. Stress tests are divided into long-term (e.g., more than 24 hours) stability stress tests under high loads and destructive stress tests that cause system crashes under extreme loads. Stress testing can be seen as a type of load testing, that is, load testing under high loads, or stress testing using load testing techniques.

2. Load test.

Load test is to simulate the system load of the actual software system under the load conditions, through continuous loading (such as gradually increasing the number of simulated users) or other loading methods to observe the response time and data throughput of the system under different loads, the resources occupied by the system (such as CPU, memory), etc., to test the behavior and characteristics of the system, in order to find possible performance bottlenecks, memory leaks, real-time synchronization and other problems of the system. Load testing is more about a method or a technique.

3. Concurrent testing.

Refers to whether there are hidden concurrency problems, such as memory leaks, thread locks, and resource contention problems when multiple users concurrently access the same application, module, and data.

Second, the purpose is different.

1. Stress test.

The purpose is to improve the reliability and stability of the software system, reduce the downtime of the system and the resulting losses by performing repeatable load tests to understand the system reliability and performance bottlenecks before the software is put into use or before the software load reaches the limit.

2. Load test.

The goal of load testing is to determine and ensure that the system will function properly in excess of the maximum expected workload. In addition, load testing evaluates performance characteristics. For example, response time, transaction rate, and other time-related aspects.

3. Concurrent testing.

The purpose of testing is not to obtain performance metrics, but to find problems caused by concurrency.

Third, the characteristics are different.

1. Stress test.

Stress testing is usually carried out to test the stability of the system under high load conditions, and more effectively find hidden dangers in the stability of the system and the hidden dangers of the system's function under the condition of peak load.

2. Load test.

Load testing is the process of changing the load pattern of the system, increasing the load, etc., to find the performance problems in the system.

3. Concurrent testing.

In the specific performance testing work, concurrent users are often simulated with the help of tools, for example, the loadrunner performance test tool is called virtual users, because in the actual situation, the test environment requirements to achieve simultaneous multi-person concurrency are relatively high, the test cost is high, and the test time is relatively long.

Performance test: power, load test load, stress test strength;

Stress test: It is the impact of long-term continuous operation of the system on the performance of the system under certain load conditions;

Load test: The load on the system and the response time of the system under a certain workload.

Introducing to you:

Performance Testing: Collects all the performance related to the test, which is usually used by different people in different situations.

Load test: It is a performance test that refers to whether the program can withstand the data running in an overloaded environment.

Stress test: It is the impact of long-term continuous operation of the system on the performance of the system under certain load conditions;

Performance testing, load testing, and stress testing are often heard about, and interview questions are often encountered, but the connection and difference between the three is not clear. I went to the forum with questions, and found that everyone has their own understanding, and the following is the one I see the most and I recognize:

In terms of testing methods and tools, the three are almost the same. Whereas, performance testing is the parent set of load testing and stress testing. Here are the definitions of the three types of tests:

Performance Testing: Obtain the performance indicators of the system by changing the load conditions for testing.

Load test: Under certain software and hardware configurations, the maximum load that the system can withstand is tested by continuously increasing the load, and the performance of the system will be reduced if the load is exceeded.

Stress test: Under certain software and hardware configurations, the stability of the system is tested through continuous high load.

Personal understanding: performance test emphasizes obtaining the performance indicators of the system under different loads, load testing emphasizes obtaining the optimal load of the system and deriving the performance bottleneck, and improving the optimal load of the system through continuous tuning, and stress testing emphasizes whether the system can operate stably under high load.