Re: [squid-users] Elapsed Time

Thanks to all for your time and replies.

Alejandro

Jeffrey Goldberg escribió:
> On Jun 22, 2009, at 7:03 PM, Amos Jeffries wrote:
>
>> On Mon, 22 Jun 2009 15:50:51 -0300, Alejandro Martinez
>> <amartinez_at_equital.com.uy> wrote:
>>> Amos, thanks for your reply.
>>>
>>> The last question, how do youy estimate that time ??
>>
>> Now there is a deep philosophical question. You would probably best
>> look up
>> research info to get an accurate answer. [...]
>
> I realize that I'm jumping in late into this discussion, but I think
> that the most productive route would be to look at the algorithms used
> by website statistics programs which claim to report such things.
>
>> Basically: requests are broken into 3 sets: unprocessed, selected, and
>> finished.
>>
>> 1) take request X as a starting point.
>> 2) Then select all requests that have X as a referrer made within 30
>> seconds (user max attention span for page load time).
>> 3) Repeat (2) until no more requests are added using referer info.
>> 4) Then pick a timespan T and select all requests made from same IP as X
>> within time T of the existing range.
>> 5) shuffle the first request we started with in (1) into the finished
>> pile.
>> 5) for each request now selected (4) go back and repeat (1)->(4) for X
>> being that selected request.
>> 6) repeat steps (2)->(5) until there are no new requests to handle.
>> 7) track the earliest and latest timestamp from all requests
>> processed in
>> the above. Your 'visitor time' for _one_ session is the difference
>> between
>> those two.
>
> That seems plausible to me. Considering the wide spread use of NAT,
> I'd recommend using User-agent along with IP in step 4.
>
>> I highly recommend finding an existing tool that does all this for you.
>> Writing it from scratch is complicated at best and I'm sure I missed
>> some
>> complex issue out of my quick description above.
>
> Agreed. And I think that the place to look for existing tools is in
> various webstats programs.
>
> Cheers,
>
> -j
>
>
Received on Tue Jun 23 2009 - 11:29:43 MDT