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From sebb <seb...@gmail.com>
Subject Re: Generate Summary Results - Incorrect Calculations?
Date Wed, 07 Jan 2009 14:29:19 GMT
[Cross-post to JMeter-dev list removed]

On 07/01/2009, Woodcock, Simon <swoodcoc@qualcomm.com> wrote:
>
>  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.
>
>
>
>
>  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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