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By default, JMeter sends the request without pausing between each request. In that case, JMeter could overwhelm your test server by making too many requests in a short amount of times.
Let imagine that you send thousands request to a web server under test in a few seconds. This is what happens!
Timers allow JMeter to delay between each request which a thread makes. A timer can solve the server overload problem.
Also, in real life visitors do not arrive at a website all at the same time, but at different time intervals. So Timer will help mimic the real-time behavior.
In this tutorial, you will learn
Following are some common types of a timer in JMeter
Constant timer delays each user request for the same amount of time.Gaussian Random Timer:
Gaussian random timer delays each user request for a random amount of time.Parameters:
Descriptive name for this timer that is shown in the tree
A parameter of Gaussian Distribution Function
Constant Delay Offset (milliseconds)
Additional value in milliseconds
So the total delay is described as below figure:Uniform Random Timer:
Uniform random timer delays each user request for a random amount of time.Parameters:
Name Descriptive name for this timer that is shown in the tree
Random Delay Maximum Maximum random number of milliseconds to delay.
Constant Delay Offset (milliseconds) Additional value in milliseconds
The total delay is the sum of the random value and the offset value.BeanShell Timer
The BeanShell Timer can be used to generate a delay time between each user request.BSF Timer
The BSF Timer can be used to generate a delay between each user request using a BSF scripting language.JSR223 Timer
The JSR223 Timer can be used to generate a delay between each user request using a JSR223 scripting languageHow to Use Constant Timer
Let start with a simple test script
Delay between each user request is 5000 ms
Here is the roadmap for this practical example:Pre-condition:
We re-use the Step 1 and Step 2 in tutorial JMeter Performance Testing.Step 1) Add Thread Group
In Thread Group control panel, enter Thread Properties as followingStep 2) Add JMeter elements
Add HTTP request default
Add HTTP requestStep 3) Add Constant Timer
Configuring Thread Delay of 5000 millisecondsStep 4) Add View Results in Table
View Results in Table displays the test result in table format.
View Results in Table displays as below figureStep 5) Run your test
This is the result of this test
For example, in the above figure, let analyze the Sample 2
Start time is 22:05:01.866
Sample Time of Sample 2 is 172 ms
Constant Timer: 5000 ms (as configured)
End Time of this sample is = 22:05:01.866 + 172 + 5000 = 22:05:07.038
So the Sample 3 should start at the time is 22:05:07.039 ( As shown in the above figure)
The delay of each sample is 5000 ms
If you change the Constant Timer is zero, you will see the result is changed
Let analyze the Sample 1
Start time is 22:17:39.141
Sample Time of Sample 2 is 370 ms
Constant Timer : 0 ms (as configured)
End Time of this sample is = 22:17:39.141+ 370 + 0 = 22:17:39.511
So the Sample 2 should start at the time is 22:17:39.512 (Shown in the above figure)Troubleshooting:
If you face the issue while running the above scenario … do the following
Check whether you are connecting to the internet via a proxy. If yes, remove the proxy.
Open a new instance of JMeter
Open the chúng tôi in Jmeter
Run the Test
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