By default each JMeter thread (virtual user) executes samplers *upside
down* (unless you use Logic Controllers
<https://jmeter.apache.org/usermanual/component_reference.html#logic_controllers>
to amend this behaviour)
It means that if you have 4 HTTP Calls like:
* HTTP Call 1
* HTTP Call 2
* HTTP Call 3
* HTTP Call 4
JMeter will run them sequentially, there is no need to use either
Critical Section Controller or Synchronizing Timer or whatever.
Just remember about JMeter Scoping Rules
<https://www.blazemeter.com/blog/jmeter-scoping-rules-the-ultimate-guide/>
and JMeter Variables
<https://jmeter.apache.org/usermanual/functions.html>specifics, i.e. if
you have a Post-Processor extracting something applied to all Samplers -
only last value will be written to the variable. And if you use the same
variable name in 2 separate Post-Processors - the latter one will
overwrite the previous value.
On 11/10/2021 5:26 PM, SMITH Lindi wrote:
Hello
I wonder if anyone could help me with a load test I’m trying to set up
at the moment.
The test I’m writing has 3 HTTP calls which have to be made before a
4^th HTTP call can be made (the 4^th call is dependent on the previous
3 calls having been run and needs their responses in order to bring
back a successful response.)
So after looking online, I have put my calls under a ‘Critical section
controller’ , which is working fine and the 4^th call is now passing
and getting a successful response.
My issue is that as soon as I try to run this test with more than 1
thread group (user) , it is essentially behaving as a series of
sequential calls, where calls 1-4 of the first thread group (user
count) will run before the next calls 1-4 of the following user count
will run. Obviously this is not very indicative of how things might go
in production, as there might be say 2 or 3 users at any given time
doing the actions at the same time, but where their individual subset
of actions are being called in a critical order.
Is there anything I can use on my test plan to fire off say 2 or 3 of
the same thread groups at the same time, but within the thread group I
have my critical section controller with the HTTP requests underneath
it to ensure the calls are being made in a concurrent order?
I saw there is something called ‘synchronizing timers’ but when I
looked this up, it didn’t seem it could be used in conjunction with
the ‘critical section controller’.
Any ideas would be greatly appreciated
Many thanks
Lindi
*Lindi**SMITH*
Application Developer
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