Introduction to pressure measurement of JMeter

One 、 What is pressure measurement ？

Analysis of common terms in pressure measurement
TPS: Number of transactions executed per second （ Example is executed every minute 70 One transaction ,tps= 70/60=1.17, It indicates that it can process 1.17 One transaction ）
Mean response time ： It's the average time needed to process a transaction

Two 、 The purpose and significance of pressure measurement

Purpose ：
1、 Test the maximum processing capacity of the system , Find the biggest tps, Judge tps And whether the response time meets expectations
2、 The maximum concurrency of the test system , When the system goes down , Program crash , The error reporting rate continues to rise , Program not responding , If the response time exceeds the tolerable range, it can be considered that the system has reached the maximum concurrency .

3、 ... and 、jmeter Pressure measurement

1、jmeter Use

1.1、jmeter Two thread group operation modes

a、 Number of runs
That is, the running of the script is determined by the specified number of times

b、 Run duration
That is, within a specified time , The script will be run according to the set time

1.2 It's usually used Jmeter stay liunx At the command line , Generally, a press is needed , The pressure measuring machine and the project will be separated

1.2.1 After the press is configured with the environment
The press needs to be installed and configured JDK
Then put it in windows Upload the debugged script to the press
You need to get into Jmeter Add execution permission under the root directory chomod -R +x./*

1.2 .2 Use the command line for pressure measurement
jmeter -n -t XXX.jmx -l result.jtl
-n: Command line mode ,no-gui
-t:jmx Script path
-l : jtl The path where the result file is stored

2、 Performance testing strategy

2.1、 Pressurization strategy
Incrementally increase the number of concurrent , Observe tps And response time , And record tps And response time , Look for a turning point

2.2、 Execution strategy
a、 Pressure test stage ： First select a duration according to the progressive increase （ The specific time is selected according to different scenes , General choice 180S/60S）, Concurrency number （ Determine the concurrency number according to different projects , At the beginning, you can choose to increase each time 10, If you add 10 I found that the performance was very good , You can increase the number of concurrent points , Reduce test time ）, And record tps And response time , Find the inflection point
b、 Heavy pressure stage ： Find the inflection point , Before and after the inflection point 5 Group concurrency , Run again (3-5 minute ） Then record the detailed data
3.3 Examples of performance testing strategies ：
Single interface pressure measurement ： seeing the name of a thing one thinks of its function , That is, only one interface is tested
Pressure test of mixing interface ： Determine the number of concurrency in proportion