performance - What is the difference between Ramp up time and Synchronization timer

Question

Example:

`1. No of Threads = 100 Ramp-up time = 20, means every 1 second = 5 requests will be processed. Loop Count =1

2. In the same time: If i will do like below No of Threads = 100 Ramp-up time = 1, Loop Count =1`

And put Synchronization Timer : No of Simulated user to group = 5. In this case as well, J meter process 5 requests at one time.

So what is the different logic between the above 2 concepts.

question from:https://stackoverflow.com/questions/65883520/what-is-the-difference-between-ramp-up-time-and-synchronization-timer

Answer 1

Considering case 1 where the Number of threads = 100, Ramp-up time = 20 and loop count =1. This means that for every one sec 5 threads will be induced. Depending on the time taken for the response the test will run for at least 20 sec or more.

Considering case 2 where the Number of threads = 100, Ramp-up=1, loop count=1 and Adding Synchronization Timer with No of Simulated user to group = 5 A batch of 5 users will be added at once.

Both the tests don't take the same amount of time to complete.

• In case 1, 5 users are distributed over a period of one sec. i.e. per 0.2 sec one user is added.
• In case 2, 5 users are added to the active thread in one go.

To know more about Synchronizing Timer

To best understand the difference between the 2 use cases, increase the number of threads to 200 while keeping the remaining parameters as is. Then the difference can be noticed easily.