On 15 August 2010 16:17, Christopher Nagel <[email protected]> wrote: > 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.
Did you have any other timers in the test plan? If not, then try adding a random timer to ensure that the samples don't bunch together. > 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 >> >> >> >> > > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
