JMeter load test finds the maximum number of concurrent users (including step analysis)

Load test concept

Gradually increase the number of concurrent users , Find out the maximum acceptable number of concurrent users of the system under test , And investigate the change of system performance .

Overall script design ：

Scenario introduction ：

1. First, use the plug-in manager to download the plug-in jpgc - Standard Set, And then restart jmeter

2. Add thread group [email protected] - Stepping Thread Group

3 Add request samplers and other configuration components under the thread group , And fill in the interface parameters , The tested interface in this article is the registered interface

4. Add listener ：

[email protected] - Active Threads Over Time（ Graph of the number of active threads over time ）

[email protected] - Response Times Over Time（ Response time versus time ）

[email protected] - Transactions per Second（tps Time variation diagram ）

[email protected] - Stepping Thread Group Fill in data , Scene is in 5 Increase in seconds 10 Number of concurrent users , And run 30 second , And continue to 5 Increase in seconds 10 Number of concurrent users , Repeat the cycle , Until the number of concurrent users reaches 50 Run the script after 60 second . Then at every 1 Second reduction 5 Number of concurrent users , Until reduced to 0, End the script .

6. Run the script for the first time , Observe the data after completion ：

  It is known from the graph that ：1. When the number of concurrent users is 20 when , The average response time exceeds 1.5 second

                       2.tps There is no obvious downward trend in the whole process , There is no continuous error report

  Run script analysis for the first time ： So come to the conclusion , The maximum number of concurrent users of the system is 10~20 Section

We have obtained that the maximum number of concurrent users of the system is 10~20 Section , How much is it ？ Next, reduce the step size , And carry out the second test

[email protected] - Stepping Thread Group Fill in data , The scene is based on 10 Based on the number of concurrent users , stay 1 Increase in seconds 1 Number of concurrent users , And run 30 second , And continue to 1 Increase in seconds 1 Number of concurrent users , Repeat the cycle , Until the number of concurrent users reaches 20 Run the script after 60 second . Then at every 1 Second reduction 5 Number of concurrent users , Until reduced to 0, End the script .

 8. Run the script a second time , Observe the data after completion ：

 

 

It is known from the graph that ：1. When the number of concurrent users is 17 when , The average response time exceeds 1.5 second

                       2.tps There is no obvious downward trend in the whole process , There is no continuous error report

  Run script analysis for the second time ： So come to the conclusion , The maximum number of concurrent users of the system is 16