I think it is because a 'config element' is processed once when the test plan
is loaded, but a 'pre-processor' is processed before each sample is run. There
is a similar 'config element' called "User Defined Variables" that are
processed at load-time for the test case. But bear in mind, if you use these -
only the last one in the whole test plan is valid for a given variable.
Whereas, if you use "User Parameters" those are valid for a specific sample
based on the how they are defined as the test case is processing.
For example, say you have a test plan that looks like this:
User Defined Variables: username = foobar
Thread Group 1: (uses '${username}' variable)
User Defined Variables: username = notfoobar
In this case, when you run the test plan, the ${username} variable will be set
to "notfoobar" - because the "User Defined Variables" are all processed
_before_ the thread group runs - and the value is set to the last one that
defined it.
In example 2, we see User Parameters at work:
Thread Group 1:
User Parameter: username = foobar${__threadNum}
Sampler A: (uses ${username} variable)
Thread Group 2:
User Parameter: username = notfoobar${__threadNum}
Sampler B: (uses ${username} variable)
In this example, Thread Group 1 will increment the 'username' value through
"foobar1", "foobar2", etc. for as many different threads as you run through it.
Likewise, thread group 2 will increment the username variable through
"notfoobar1", "notfoobar2", etc. because the User Parameters are evaluated at
the sample run time.
--
Robin D. Wilson
Sr. Director of Web Development
KingsIsle Entertainment, Inc.
VOICE: 512-777-1861
http://www.kingsisle.com
-----Original Message-----
From: Shmuel Krakower [mailto:[email protected]]
Sent: Monday, March 24, 2014 3:03 AM
To: JMeter Users List
Subject: User Parameters Pre Processor
Hi,
I was wondering why the User Parameters is a pre-processor rather than a Config
Element?
I just spent few minutes looking for it in the wrong place... ;)
Best,
Shmuel Krakower.
www.Beatsoo.org - re-use your jmeter scripts for application performance
monitoring from worldwide locations for free.
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