I am not aware of a tool which does it.
I use Splunk to graph me the apache access logs and get throughputs. I
think they have a free SaaS service you can use...
On Nov 27, 2012 11:37 PM, "Anthony Johnson" <[email protected]> wrote:

> Another idea If you want to calculate this going forward, you could
> simply use the %T for a custom access log in apache.
>
> http://httpd.apache.org/docs/2.2/mod/mod_log_config.html#formats
>
> %T gives you the total time it took to service a request.  From there
> it should be trivial to parse that access_log and determine
> concurrency at any point for any URL.
>
> On Tue, Nov 27, 2012 at 3:50 PM, Enric Jaen <[email protected]> wrote:
> > I appreciate your answers,
> >
> > Flavio, for me a problem with the 'netstat' approach is that doesn't
> distinguish URLs. We have a JBoss running several apps, so it's necessary
> to filter by app.
> >
> > Shmuel, I agree with respect you said about tomcat sessions and action
> throughtput , but I ask for a tool  before looking logs or metrics by
>  myself.
> >
> > Best regards,
> > /Enric
> >
> >
> > ________________________________
> >  De: Flavio Cysne <[email protected]>
> > Para: JMeter Users List <[email protected]>; Enric Jaen <
> [email protected]>
> > Enviado: Martes 27 de noviembre de 2012 13:06
> > Asunto: Re: tools to measure average concurrent users?
> >
> >
> > This answer, at StackExchange, may help you:
> http://webmasters.stackexchange.com/questions/24687/get-the-number-of-concurrent-users-in-apache
> >
> >
> >
> > 2012/11/27 Enric Jaen <[email protected]>
> >
> > Hello all,
> >>
> >>In order to create a concurrent scenario with JMeter as real as
> possible, I'd like to know previously what  is the average  concurrency
> access to my website (based on historical data)
> >>
> >>I'd like to reach to a number such as for example, the average  users
> accessing the website simultaneously is 100
> >>(which will be the number of JMeter threads)
> >>
> >>
> >>I guess it must be based in the apache logs. I know about AwStats or
> 123LogAnalizer, but I don't think they provide such information.
> >>
> >>How do you obtain the concurrent number of users accessing a website?
>  Are you aware of any tool ?
> >>
> >>Regards,
> >>/Enric Jaen
>
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