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Posted to user@jmeter.apache.org by Ivan Neto <iv...@gmail.com> on 2007/05/04 03:37:20 UTC
I'm not understanding the "Generate Summary Results" output
Hi,
I'm not understanding the numbers printed by "Generate Summary Results". If
I run JMeter with the following configuration:
Number of Threads: 1, Ramp-up Period: 0, Loop count: 1000
I get the following response on System.out (my test plan makes only one HTTP
request):
Generate Summary Results = 1000 in 4.6s = 218.6/s Avg: 4 Min: 1
Max: 119 Err: 0 (0.00%)
As far as I know, the average time should be calculated as:
total_time / number_of_requests = 4.6 / 1000 = 0.00046s ~ 4 ms
But when I execute the same thread group with another configuration (changed
the number of threads):
Number of Threads: 2, Ramp-up Period: 0, Loop count: 1000
I get the following response on System.out:
Generate Summary Results = 2000 in 4.6s = 439.2/s Avg: 3 Min: 1
Max: 43 Err: 0 (0.00%)
I now have 2000 requests in the same 4.6 seconds (as in the first output).
But the average time is not 4.6 / 2000 = 0.00023 = 2.3 ms. How does JMeter
calculate the average time when there are multiple threads?
Thanks in advance.
--
Ivan Neto
Re: I'm not understanding the "Generate Summary Results" output
Posted by sebb <se...@gmail.com>.
The Min Max and Avg are calculated on individual sample times.
On 04/05/07, Ivan Neto <iv...@gmail.com> wrote:
> Hi Oliver!
>
> Thanks for your answer!
>
> On 5/4/07, Oliver Erlewein (DSLWN) <Oliver.Erlewein@datacom.co.nz > wrote:
> >
> > Hi Ivan,
> >
> > Not quite sure whether this is what you're after but here goes... (I
> > don't have coding know-how of JMeter though!!):
> >
> > 1000 / 4.6 = 217.39/s
> > 2000 / 4.6 = 434.78/s
> >
> > The differences to the values below is probably the rounding error in
> > the 4.6 seconds (@Sebb: might pay to make that double digit after the
> > delimiter).
>
> In fact I'm not sure how the average time ("Avg:") is calculated when
> there's more than one thread. I think that the average time should be:
>
> total_execution_time_of_all_threads / total_number_of_requests
>
> So, if my test plan starts two threads, each of them executing 1000 HTTP
> requests, and each thread runs for 4.6 seconds, then the average time per
> request should be:
>
> (4.6 + 4.6) / (1000 + 1000) = 0.0046 seconds = 4.6 milliseconds
>
> Does this make any sense?
>
> Regards,
>
> Cheers Oliver
> >
> > -----Original Message-----
> > From: Ivan Neto [mailto:ivanneto@gmail.com]
> > Sent: Friday, 4 May 2007 13:37
> > To: jmeter-user@jakarta.apache.org
> > Subject: I'm not understanding the "Generate Summary Results" output
> >
> > Hi,
> >
> > I'm not understanding the numbers printed by "Generate Summary Results".
> > If I run JMeter with the following configuration:
> >
> > Number of Threads: 1, Ramp-up Period: 0, Loop count: 1000
> >
> > I get the following response on System.out (my test plan makes only one
> > HTTP
> > request):
> >
> > Generate Summary Results = 1000 in 4.6s = 218.6 /s Avg: 4 Min:
> > 1
> > Max: 119 Err: 0 (0.00%)
> >
> > As far as I know, the average time should be calculated as:
> >
> > total_time / number_of_requests = 4.6 / 1000 = 0.00046s ~ 4 ms
> >
> > But when I execute the same thread group with another configuration
> > (changed the number of threads):
> >
> > Number of Threads: 2, Ramp-up Period: 0, Loop count: 1000
> >
> > I get the following response on System.out:
> >
> > Generate Summary Results = 2000 in 4.6s = 439.2/s Avg: 3 Min:
> > 1
> > Max: 43 Err: 0 (0.00%)
> >
> > I now have 2000 requests in the same 4.6 seconds (as in the first
> > output).
> > But the average time is not 4.6 / 2000 = 0.00023 = 2.3 ms. How does
> > JMeter calculate the average time when there are multiple threads?
> >
> > Thanks in advance.
> >
> > --
> > Ivan Neto
> >
>
>
>
> --
> Ivan Neto
>
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Re: I'm not understanding the "Generate Summary Results" output
Posted by Ivan Neto <iv...@gmail.com>.
Hi Oliver!
Thanks for your answer!
On 5/4/07, Oliver Erlewein (DSLWN) <Oliver.Erlewein@datacom.co.nz > wrote:
>
> Hi Ivan,
>
> Not quite sure whether this is what you're after but here goes... (I
> don't have coding know-how of JMeter though!!):
>
> 1000 / 4.6 = 217.39/s
> 2000 / 4.6 = 434.78/s
>
> The differences to the values below is probably the rounding error in
> the 4.6 seconds (@Sebb: might pay to make that double digit after the
> delimiter).
In fact I'm not sure how the average time ("Avg:") is calculated when
there's more than one thread. I think that the average time should be:
total_execution_time_of_all_threads / total_number_of_requests
So, if my test plan starts two threads, each of them executing 1000 HTTP
requests, and each thread runs for 4.6 seconds, then the average time per
request should be:
(4.6 + 4.6) / (1000 + 1000) = 0.0046 seconds = 4.6 milliseconds
Does this make any sense?
Regards,
Cheers Oliver
>
> -----Original Message-----
> From: Ivan Neto [mailto:ivanneto@gmail.com]
> Sent: Friday, 4 May 2007 13:37
> To: jmeter-user@jakarta.apache.org
> Subject: I'm not understanding the "Generate Summary Results" output
>
> Hi,
>
> I'm not understanding the numbers printed by "Generate Summary Results".
> If I run JMeter with the following configuration:
>
> Number of Threads: 1, Ramp-up Period: 0, Loop count: 1000
>
> I get the following response on System.out (my test plan makes only one
> HTTP
> request):
>
> Generate Summary Results = 1000 in 4.6s = 218.6 /s Avg: 4 Min:
> 1
> Max: 119 Err: 0 (0.00%)
>
> As far as I know, the average time should be calculated as:
>
> total_time / number_of_requests = 4.6 / 1000 = 0.00046s ~ 4 ms
>
> But when I execute the same thread group with another configuration
> (changed the number of threads):
>
> Number of Threads: 2, Ramp-up Period: 0, Loop count: 1000
>
> I get the following response on System.out:
>
> Generate Summary Results = 2000 in 4.6s = 439.2/s Avg: 3 Min:
> 1
> Max: 43 Err: 0 (0.00%)
>
> I now have 2000 requests in the same 4.6 seconds (as in the first
> output).
> But the average time is not 4.6 / 2000 = 0.00023 = 2.3 ms. How does
> JMeter calculate the average time when there are multiple threads?
>
> Thanks in advance.
>
> --
> Ivan Neto
>
--
Ivan Neto
RE: I'm not understanding the "Generate Summary Results" output
Posted by "Oliver Erlewein (DSLWN)" <Ol...@datacom.co.nz>.
Hi Ivan,
Not quite sure whether this is what you're after but here goes... (I
don't have coding know-how of JMeter though!!):
1000 / 4.6 = 217.39/s
2000 / 4.6 = 434.78/s
The differences to the values below is probably the rounding error in
the 4.6 seconds (@Sebb: might pay to make that double digit after the
delimiter).
Cheers Oliver
-----Original Message-----
From: Ivan Neto [mailto:ivanneto@gmail.com]
Sent: Friday, 4 May 2007 13:37
To: jmeter-user@jakarta.apache.org
Subject: I'm not understanding the "Generate Summary Results" output
Hi,
I'm not understanding the numbers printed by "Generate Summary Results".
If I run JMeter with the following configuration:
Number of Threads: 1, Ramp-up Period: 0, Loop count: 1000
I get the following response on System.out (my test plan makes only one
HTTP
request):
Generate Summary Results = 1000 in 4.6s = 218.6/s Avg: 4 Min:
1
Max: 119 Err: 0 (0.00%)
As far as I know, the average time should be calculated as:
total_time / number_of_requests = 4.6 / 1000 = 0.00046s ~ 4 ms
But when I execute the same thread group with another configuration
(changed the number of threads):
Number of Threads: 2, Ramp-up Period: 0, Loop count: 1000
I get the following response on System.out:
Generate Summary Results = 2000 in 4.6s = 439.2/s Avg: 3 Min:
1
Max: 43 Err: 0 (0.00%)
I now have 2000 requests in the same 4.6 seconds (as in the first
output).
But the average time is not 4.6 / 2000 = 0.00023 = 2.3 ms. How does
JMeter calculate the average time when there are multiple threads?
Thanks in advance.
--
Ivan Neto
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