JMeter transaction controller

What is business ？

We will pay attention to the statistics of performance test results TPS, TPS Represents the number of transactions per second , Each transaction corresponds to our request . although Jmeter It can help us count each request into a transaction , But sometimes we want multiple operations to be counted as one transaction ,Jmeter Also taking into account this need , We can do this through the transaction controller in the logic controller .

Logic controller

Logic controller , As the name suggests, it is the logic of the control program ,JMeter There are many kinds of logic controllers , Like a loop controller 、 Random controller, etc . Combined with examples, what we need is the definition of transactions , So choose the transaction controller .

Transaction controller

As shown in the figure below , Let's add a transaction controller first

The transaction controller is a component located below the logic controller component , Let's take a look at the parameter description in the figure below ：

• name ： It can be set at will , It's better to have business sense .
• notes ： It can be set at will , Can be null .
• Generate parent sample： If there are multiple samplers under the transaction controller （ request ）, Check it , So in “ View the result tree ” We can not only see the transaction controller , You can also see each sampler ; And whether the transaction defined by the transaction controller is successful depends on whether the sub transactions are successful , One of the sub transactions failed , This means that the entire transaction has failed .

Here's the picture , We deliberately let Logon Sub transaction failed （ Here I deliberately enter the wrong login password , Then assert that the response status code is 200）, We can see that the whole transaction failed .

The following figure , It means that the whole transaction is successful .

JMeter Marshal Point

The performance test needs to simulate a large number of users' concurrency , The aggregation point can make virtual users send requests at the same time , stay JMeter Middle set point is completed by timer .

Timer

JMeter The timer is used to control the execution time of the sampler , There are fixed timers 、 Random timer . Back to example , Here we choose the synchronous timer to control .

Synchro timer

As shown in the figure below , The synchronous timer is used to ensure that our sampler sends load to the server at the same time , Considering the speed of thread running time and the needs of the scenario , It also provides settings for the number of synchronization threads .

The parameters are described as follows ：

• name ： It can be set at will , It's better to have business sense .
• notes ： It can be set at will , Can be null .
• Set the number of synchronization threads , When we run the test , The running time of each thread may be different , It may take a long time to get everything together , In this case, we can let some of the assembled threads run first . Other scenarios are different, waiting for all threads to be assembled , Only some threads need to ensure synchronization , Set this option based on these requirements .

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