Re: How does ebay do it?

["Jim Franz" <franz400@xxxxxxxxxxxx>]

> >>Remember, with online stores, response time for 1or
> >>two or 10 users is not good enough. You have to be
> >>able to handle 10,000 or more simultaneous users.
>
> Just playing with a few numbers here.  If 10,000 simultaneous users
submited
> a new request at 5 second intervals, that's 2000 new requests per second.
> If the average response is 7,000 bytes, that's a demand of 14,000,000
bytes
> per second.  A T1 supports about 187,500 bytes per second.  So this site
> would require the equivalent of 75 T1 lines.  In Utah, I think that would
> cost about $90,000 per month.
>
and this is why some as400 sites (and nt & unix) serve the images from
some other service (made just for that, & a pipe a mile wide) and serve
the text from the 400. Andrew, of www.jcpenneyjewelry.com (running
on a fairly small 400 does it, and posted the info here a month or so ago.
IBM sells the software/technogy to do this if you want to do it yourself.
The other idea is that ebay, yahoo, amazon put very few images on the
screen, mostly text & links. They work real hard at design for speed,
something much of the web has not figured out yet. check out
www.useit.com the guy's on a campaign for more "easy to use" web.
jim
jim

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