What Is Timer In Jmeter?


Author: Roslyn
Published: 29 Nov 2021

Timers for User Simulations

JMeter scripts that are built with timer will be useful in simulations of real user activity. Testing without a JMeter timer can provide inaccurate test results because the simulations will come in a different pattern than what is seen in a real world situation. If you want to hit a target minute, hourly or daily transaction count, you may want to make sure every single user can execute a specific number of requests per second.

Synchronizing the Test Execution Timer

The test execution is paused for a random time. The maximum value can be specified along with the additional time with each wait. The Synchronizing timer is used to add delays in the script by blocking a certain number of threads and then releasing the threads at the same time. The spike testing is done because of the large amount of instant load generated by the synchronizing timer.

Synchronizing Timer in JMeter

JMeter Synchronizing Timer. The jmeter has different timers. Synchronizing Timer is a tool you can use in your jmeter software test plan.

It will block the threads until the number of threads reaches a certain point. What is the random timer in JMeter? The user request is delayed for a random period of time.

JMeter Timers

The requests are sent to the server without any interval. If a lot of requests are sent in a short time, it will overload the server. JMeter uses timer to delay sending next request.

JMeter will send a request in fractions of seconds if there are no timers. You can add the value of constant delay time to the Constant Timer to delay the next request. If there are multiple requests the next request will be sent to the server with the same delay.

JMeter has timers that help to delay the next request and overload the server, if the requests are sent every second. It is easier to work with different type of timers. The timers have their own behavior.

The Precise Throughput Timer

The values in the Batched Departures section of the Precise Throughput Timer allow you to control the way that the Threads are released while still maintaining the overall throughput. The previous Timer was more powerful than the Constant Throughput Timer because it was able to control threads in Thread Groups or across Thread Groups to fulfill a load profile. Both the shared and non-shared methods aim to generate the desired throughput.

The shared algorithm should be able to generate a more accurate transaction rate. The non-shared algorithm should generate more transactions. The JSR223 Timer is used in place of the BeanShell Timer because of its performance benefits.

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Timers in Thread Group Level

You may not want to set the timer at Thread Group level. The user thinks time may not be the same for all requests. Setting timer at Thread Group level can be useful. Testing a service in batches.

JMeter Test Plan

A container for running tests can be seen in a Test Plan. It gives a description of what to do and how to do it. A complete test plan consists of thread groups, logic controllers, sample-generating controllers, listener, timers, assertions, and configuration elements.

A test plan must have at least one thread group. JMeter can send specific types of requests to a server. They are trying to make a user request for a page.

If you need to perform a POST,GET, or DELETE on a HTTP service, you can add a request sampler. Listeners let you see the results of the samplers in a number of ways. They give visual access to the data gathered by JMeter about the test cases as a sample component is executed.

Assertions allow you to include a validation test on the response of your request. Demonstrating that your application is returning the correct data is possible using assertions. JMeter highlights when an assertion fails.

They are executed before any of the other Samplers that are in the same scope. The Configuration Element is only accessible from the branch where it is placed. A pre-processor element is something that runs before a sampler starts.

How long should all the threads start?

How long should it take for all the threads to start? If there are 10 threads and a ramp-up time of 100 seconds, each thread will begin 10 seconds after the last thread starts, for a total time of 100 seconds to get the test fully up to speed.

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