1.
Introduction
to Timers
If you use just threads, controllers
and samplers for load/stress testing of your application, then JMeter will just
bombard your application with incessant requests. This is not the real
environment or characteristic of the real traffic. Neither does it gives you
control to generate a given throughput or hit with n clients at the same point
of time.
So, in order to simulate real traffic or create extreme load/stress, JMeter provides you Timer elements.
So, in order to simulate real traffic or create extreme load/stress, JMeter provides you Timer elements.
2.
Configuration
of Constant Timer
A
constant Timer will introduce a fixed delay between consecutive requests of the
same thread. Let's see an example of Constant Timer in use.
-
Test Plan->Thread
Groups->Add->Timer->Constant Timer
We added Thread Delay (in milliseconds): 2000
And we run web server before and after using Constant Timer to see
difference it.
+ Before System added Constant Timer
+ After System added Constant Timer
3.
Configuration
of Constant Timer
Constant Throughput Timer will introduce random delays
between requests in such a way that a load/stress of required throughput is
sent to test application. Let's see an example of
Constant Throughput Timer in use.
Adding Constant Throughput Timer as below:
Test Plan->Thread
Groups->Add->Timer->Constant Throughput Timer
Configuring Constant Throughput Timer for 60 requests per
minute
Result without Constant Throughput Timer
Result with Constant Throughput Timer
4.
Configuration
of Synchronizing Timer
Synchronizing Timer will synchronize requests of multiple
threads. What this means is, it will add delays between requests such that all
threads fire at the same time thus creating heavy load bursts on your
application. Let's see an example of Synchronizing
Timer in use.
Adding Constant Throughput Timer as below:
-
Test Plan->Thread
Groups->Add->Timer->Synchronizing Timer
Adding Number of Simulated Users to Group by: 3
Result without Synchronizing Timer
Result with Synchronizing Timer
5.
Configuration
of Gaussian Random Timer
I have example about configuration of
Gaussian Random Timer. You see that when we used Gaussian Random Timer, It is
paused the Thread for the random time.
Adding Gaussian Random Timer as below:
-
Test Plan->Thread
Groups->Add->Timer->Gaussian Random Timer
-
Configuration for
Thread Delay Properties such as:
Deviation(in
milliseconds): 5000
Constant
Delay Offset (in milliseconds): 1000
Result without Gaussian Random Timer
Result with Gaussian Random Timer
6.
Configuration
of Uniform Random Timer
Work Uniform Random timer same with Gaussian
Random Timer but each time interval having the same probability of occurring.
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