On 07/01/2009, Woodcock, Simon <[email protected]> wrote:
> Thanks for your prompt response Sebb. Apologies for the cross-post.
>
>  So you are confident that results given ( requests per second ) for both the 
> interval and total times are accurate and that there are no known bugs in 
> this area?

Reasonably so.

If you have saved the individual results to a JTL file you can check
the overall results for yourself, by checking for the min start time
and the max end time.

>  Regards,
>
>
>  Simon.
>
>
>  -----Original Message-----
>  From: sebb [mailto:[email protected]]
>  Sent: 07 January 2009 14:29
>  To: JMeter Users List
>  Subject: Re: Generate Summary Results - Incorrect Calculations?
>
>  [Cross-post to JMeter-dev list removed]
>
>  On 07/01/2009, Woodcock, Simon <[email protected]> wrote:
>  > Help please . .
>  >
>  >  I'm I misinterpreting the summary results? Take the following for example 
> . .
>  >
>  >  Generate Summary Results +   127 in  14.4s =    8.8/s Avg:   122 Min:     
> 7 Max: 783 Err:     0 (0.00%)
>  >  Generate Summary Results +  7681 in 179.9s =   42.7/s Avg:  1269 Min:     
> 1 Max: 17388 Err:     0 (0.00%)
>  >  Generate Summary Results =  7808 in 194.3s =   40.2/s Avg:  1251 Min:     
> 1 Max: 17388 Err:     0 (0.00%)
>  >  Generate Summary Results + 10258 in 192.9s =   53.2/s Avg:  3589 Min:     
> 1 Max: 43845 Err:     3 (0.03%)
>  >  Generate Summary Results = 18066 in 374.3s =   48.3/s Avg:  2578 Min:     
> 1 Max: 43845 Err:     3 (0.02%)
>  >  Generate Summary Results + 11856 in 188.9s =   62.8/s Avg:  2683 Min:     
> 0 Max: 45321 Err:     6 (0.05%)
>  >  Generate Summary Results = 29922 in 554.4s =   54.0/s Avg:  2620 Min:     
> 0 Max: 45321 Err:     9 (0.03%)
>  >
>  >  Total number of requests are an addition of requests made in each 
> interval -  127+7681+10258+11856 = 29922
>
>  Agreed.
>
>  >  Total time would then, you would assume, be an addition of each of the 
> interval times - 14.4+179.9+192.9+188.9 = 576.1s
>
>  No, the total time is calculated independently from the first and last
>  times seen.
>
>  The variation is due to timer resolution.
>
>  >  However, total time seems to be calculated as -  14.4+180+180+180 = 554.4s
>  >
>  >  Where 180s is the default interval time.
>  >
>  >  When calculating total request per second, the calculation is:
>  >
>  >  29922 / 554.4 = 53.97 requests per second
>  >
>  >  As opposed to:
>  >
>  >  29922 / 576.1 = 51.94 requests per second
>  >
>  >  Is there not a discrepancy in the total elapsed time and therefore the 
> requests per second or am I completely misunderstanding the results given?
>
>  See above.
>
>  >  Any help clarifying this would be greatly appreciated.
>  >
>  >
>  >  Thanks in advance,
>  >
>  >
>  >  Simon.
>  >
>  >  --
>  >  Simon Woodcock
>  >  Staff Engineer / Manager
>  >
>  >  QUALCOMM Poole Limited
>  >  Voyager House, 253-257 High Street North, Poole, Dorset, BH15 1DX UK
>  >  Tel: +44 (0)1202 440610, Fax: +44 (0)1202 440601
>  >  www.qualcomm.com<http://www.qualcomm.com>
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