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From Oliver Lloyd <oliver_ll...@hotmail.com>
Subject Re: Odd problem with performance of JMeter
Date Wed, 22 Jun 2011 21:18:58 GMT
Just a note on the Constant Throughput business. It's not intuitive, it's
true. But if you select - 'this active thread only' and also remember that
it will apply to all threads in scope then it's actually a really solid
little workhorse - it's one of the things I like best about JM. Try putting
it as a child of the main request in your journey - sounds like you only
have one so that's easy. Then, like that, each thread will only run X times
per minute where X is the number you give it. 

Say you have 100 threads and a value of 30 for the CTT, that will generate
50 requests a second. Then, so long as your response times remain below 1
second your test will hold this rate of requests and you can ascertain how
your system performs and if it will maintain this load without degrading
(memory leaks etc). If response time is or rises above 1 second then the
load will not be achieved.

You could equally have 200 threads and X as 15 in the CTT - you'd get the
same throughput but now your requests would have a 2 second window to
complete in.

Note. Typically, this sort of load with the response body sizes you mention
should be doable in the GUI, you could probably also use a few listeners,
give it a whirl. (Notice the heavy use of conditional tense there though!)

The CMD line option is brilliant , another reason I like JM, but Sebb is
right (he's always right) you must have the gen summary results listener -
you're blind otherwise.

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