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What are Timers?

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:

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:

Attribute Description

Name

Descriptive name for this timer that is shown in the tree

Deviations (milliseconds)

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:

Attribute Description

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 language

How 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 following

Step 2) Add JMeter elements

Add HTTP request default

Add HTTP request

Step 3) Add Constant Timer

Configuring Thread Delay of 5000 milliseconds

Step 4) Add View Results in Table

View Results in Table displays the test result in table format.

View Results in Table displays as below figure

Step 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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