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The first performance test practice, there are "100 million" a little nervous

2022-08-05 03:59:00 【Pit player】

Recently, a fan did a performance test and kept asking me questions. He felt that he didn't even know the basic concepts, so he started to work vigorously. If there is a problem, he expects me to solve it by hand.

"Sharpen the knife without accidentally chopping wood", we have figured out the skills of performance testing, and the test will be much smoother.

Confirm requirements

Determine performance requirements and performance testing plans, determine the scope of performance testing (which scenarios are covered), performance testing strategies, the number of concurrent users, and pressure methods.

Assignment of time, personnel, and tasks. Generally, time for performance testing is reserved in the overall test plan.The performance test plan is the core content before the performance test is carried out, and it determines the index standard of how the performance test is carried out.

It mainly includes performance requirement research, performance testing scope, performance testing strategy, number of concurrent users and pressure methods, performance testing plan, use cases, etc.The most important part of the performance test plan is to calculate the number of concurrent users.

There is a core content in performance testing that cannot be avoided when talking about performance testing, which is the calculation of the number of concurrent users.At present, the evaluation strategy for a large number of concurrent users used in performance testing is the 80-20 rule.

By evaluating the system peak period and peak period with the project team (including customers and products), get the number of users in the peak period.

Assume that the peak period of this e-commerce system is 10:00 am on Double Eleven. The number of users during the peak period (for seckill/group purchase activities) is 10W, and the peak period is 15 minutes.Then we can calculate the number of concurrent users through the 20-80 rule, that is, 80% of users will complete the transaction in 20% of the time, and the calculation result is: (10W80%)/(15 minutes 60 seconds 20%)=80000 people/180 seconds = 444.44 people.

Because the company's products are not only to meet the current performance requirements, but also to meet the performance requirements of the next 3 years, and the company's business is growing (no growth will be killed), and it is expected to grow by 20% (leader saidAfter 3 years, the number of concurrent users is: 444.44 * 1.2 * 1.2 * 1.2 = 768, then the number of concurrent users per second is 768.

It can be seen from the above that the number of threads we design in the thread group is 768, the Ramp-up value is 1, and the duration is 10 minutes (common standard).

Script recording

Record the performance test script and enhance the script to make the performance test script as close as possible to the actual situation of the performance test (parameterization, association, timer, rendezvous, assertion).

Parameterized

csv data file settings
User variables and user parameters
Function Helper

Association

Extraction of previous response data: JMeter creates a regular expression extractor by adding a post-processor to the previous request. The regular expression extractor contains the reference name, that is, the name of the parameter, which can be filled in arbitrarily.

The regular expression should be filled in according to the response. The response can be obtained in the view result tree. In the view result tree, use the RegExpTester mode to view the response to obtain the data to be associated and the left and right boundaries. Use (.*?) instead.The template is generally 111, and the matching number is generally followed by 1.

Association of request data: Replace the request data that needs to be associated with the reference name of the ${} regular expression, that is, the parameter.

Assertions

There are four main types of operations to respond to assertions:

Contain: Expected results should be wrapped in actual results
Match: use regular expressions to match
Equals: exact equality (rarely used)
Substring: Same as contains, but cannot be matched using regular expressions

Run

Run performance scenarios, collect performance test results (aggregated reports, active threads per second, transaction response time per second, average transactions per second, point records per second, throughput rate), and analyze performance bottlenecks (through chart analysis).

Issue performance test report

Process description, chart and text description, defect analysis.

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