Deepak, Actually, that turns out to have been my description of the central issue: how to ramp up the number of threads in a bell curve while throttling transactions to a preset throughput.
The solution I came up with was to set thread count as a property and create 6 different command lines to set the thread counts as in the table I originally posted. The only thing I was unhappy with in the end was that the "constant throughput" was not "constant", but more like "limiting": the database guys commented that the test was rather "bursty" because the constant throughput timer reaches the predefined threshold immediately and then just sleeps everything for the rest of the minute. In other words, we'd get 190 transactions by 12:00:10 and ZERO from 12:00:11 - 12:00:59!! I may have a look at designing some kind of "Even Distribution" timer one day that allows one to manipulate a spline curve to control the overall ramp up/down of a more evenly continuous test scenario. Anyway, my question for now is answered and thanks to everyone for all the input! Regards, Chris ________________________________ From: Deepak Shetty <[email protected]> To: JMeter Users List <[email protected]> Sent: Wed, August 11, 2010 5:20:19 PM Subject: Re: How to control timing of test distribution? Hi Im not sure I understand what you mean by this >"I've tried a Constant Throughput timer, but it only takes effect after the >threads are all ramped up, so basically it starts at the 20-minute rate (given a >15-thread group)." regards deepak On Wed, Aug 11, 2010 at 1:34 PM, Christopher Nagel < [email protected]> wrote: > Hi, > > For my first JMeter project, I've been asked to accomplish the following > test > plan, but I am completely unsure if the tool can do it. > > Here is the plan, in table format, which should look OK in fixed-width > fonts: > > <pre> > Max. Txns Per Minute each 5-Minutes > Transaction Users 05 10 15 20 25 30 Total > ------------------ ----- -- -- -- -- -- -- ------ > 1. AutoPay 2 1 2 2 2 2 1 | 50 > 2. Credit card 4 1 2 3 4 3 2 | 75 > 3. Policy lookup 15 1 5 10 15 10 5 | 230 > 4. Billing Info 15 1 5 10 15 10 5 | 230 > 5. ACH 2 1 2 2 2 2 1 | 50 > Total Transactions 25 80 135 190 135 70 | 635 > </pre> > > For each transaction, I've set up a thread group (5 total). I have the > Soap > requests working fine using data from CSV files. > > My issue is setting up the throttle on threads/users and transactions so > that > they ramp up and then down evenly according to the test "plan" in the table > above. > > For example: #3 should perform 1 lookup per minute for the first 5 minutes, > then > perform 5 lookups per minute until :10 minutes pass, at which point it > should > perform 10 transactions per minute... etc. > > If I were writing Java to do this, I'd: > 1. set up a 1-minute timer to fire > 2. for each transaction type > 3. get # transactions for the current minute > 4. fire them off > > I've tried a Constant Throughput timer, but it only takes effect after the > threads are all ramped up, so basically it starts at the 20-minute rate > (given a > 15-thread group). > > Is this type of a strictly controlled transaction distribution even > possible > with JMeter? > > Thanks in advance for your help!! I look forward to learning more about > this > amazing tool. > > Regards, > Chris > > > >
