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From Ronan Klyne <>
Subject Re: Run sampler in only one thread at a time.
Date Tue, 20 Oct 2009 08:50:06 GMT
Deepak Shetty wrote:
> hi
> as far as I know , you cannot directly do this in JMeter.
> However if you get an identifiable error message when your controller user
> attempts to login (if there is already a controller logged in), then you
> might be able to poll in a loop.
Unfortunately, logging in a second time will invalidate the first 
session, and the tests using that first session will fail.

I'm starting to think about using a Beanshell timer and post-processor 
to manage a semaphore type lock, but that's really hacky and prone to 
The same could be said for writing a CGI script to handle the 
synchronisation with delayed http responses and sampling that.

> I guess you could also decouple the controller as a separate thread group
> and base a final test on how many reports he received v/s how many he should
> have
I'd like to be able to do this in the same thread so as to have the 
posted data in memory when I do the comparison. I suppose that I could 
always write that out to a file....

> regards
> deepak
> On Mon, Oct 19, 2009 at 8:03 AM, Ronan Klyne <>wrote:
>> Hi all,
>> I have a scenario to test in which there is one controller user and many
>> subordinates. Each user is only allowed to log in from one place at a time
>> (only one cookie string will be valid at once).
>> I would like the subordinates to be able to send reports to the controller,
>> and then verify that the controller recieved them. In order to compare the
>> posted data with the controllers page, I have my subordinates log out, then,
>> in that thread, log in as the controller to verify that the information was
>> sent correctly. After this is done, the thread will log out of the
>> controller account and continue it's subordinate work.
>> Is it possible to put some kind of synchronisation in my test plan such
>> that only one thread at a time is allowed to run the controller samples?
>> Thanks,
>>   Ronan
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