Re: [squid-users] relation between http req/sec and no of simulatneous accesses

On Fri, 12 Oct 2001, khiz code wrote:

> Iam sorry but i dont quite understand "benchmark peak" and "squid peak"

For example, if your benchmark setup can only produce 70 req/sec
without squid cache in the middle, do not expect it to measure 140
req/sec with Squid. This is just an example, of course. In general,
make sure your measured peak is the peak of Squid performance, and not
the peak of benchmarking tools/equipment performance.

> so for a mean response time of 0.5 secs total no of concurrent
> connections shall be 70*0.5 =35 ??? so less

Yes. Plus any idle persistent connections you may have. This counts
client-side connections only. The formula for the server-side
connections is the same though.

Alex.

> --- Alex Rousskov <rousskov@measurement-factory.com> wrote:
> > On Thu, 11 Oct 2001, khiz code wrote:
> >
> > > my cache could go upto abt 70 req/sec
> > > what i would like to understand is that 70 req/sec corresponds to
> > abt
> > > how many simultaneous client connections ..i.e how many clients can
> > the
> > > cache serve at any point of time
> > >
> > > Robin stevens had given a figure of 2500 simultaneuos access for
> > > 150 req/sec so cud i apply simple math logic to arrive at a
> > > corresponding statistic for 70 req/sec which turns out to be
> > > roughly 1000 simultaneous accessess ???
> >
> > You cannot apply "simple math logic" here unless your response times
> > are the same as what Robin Stevens observed.
> >
> > I think there is only one formula that ties the number of
> > active concurrent connections (C) and request rate (R):
> > C = R * mean_request_response_time
> > The above does not account for idle persistent connections, of
> > course.
> > C has little to do with the number of users. One user can have 1, 3,
> > 4, or any number of connections open, depending on what kind of a
> > "user" they are.
> >
> > N.B. Make sure your 70/sec peak is not a benchmark bottleneck (as
> > opposed to Squid peak).
> >
> > Alex.
> >
> >
>
>
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Received on Fri Oct 12 2001 - 10:24:26 MDT