System Configuration - [SPAM] Email found in subject - [SPAM] Email found in subject

[Bruce Cheney]

Christopher,

Thanks for your suggestions.

>How often does your data change?

We will be serving up live datasets that change constantly.  But to
begin with we are expecting to do an update once a week or once a month
for each dataset.  I will look at your suggestions regardless to see how
they might fit the process.


Bruce Cheney
Gateway Mapping, Inc
www.gatewaymapping.com
801.221.7656

-----Original Message-----
From: Christopher Schmidt [mailto:crschmidt at metacarta.com] 
Sent: Thursday, November 08, 2007 4:57 PM
To: Bruce Cheney
Cc: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] System Configuration - [SPAM] Email
found in subject - [SPAM] Email found in subject

On Thu, Nov 08, 2007 at 04:30:46PM -0700, Bruce Cheney wrote:
> Ed,
>  
> I very much appreciate your help.  Very insightful. Yes expectations 
> are 50,000 users at least at the same time.

How often does your data change? You might think about using a tiling
client and a tile caching solution on the server if it changes
infrequently...

TileCache has been known to serve up to a couple hundred requests a
second, but that won't provide anywhere near the level of performance
you're looking for, I suppose: I've never served more than a steady
stream of ~200-300 requests a second with Apache, and that was a pretty
unusual circumstance. 

I recommend you sit down with a single user, have them browse around
your site, and track their requests a second. In doing this at
MetaCarta, we found that our users using a specific application only
generated 1-2 actions every minute -- meaning that with 50,000 users you
might be getting down to something sustainable ...

I'd personally use OpenLayers and TileCache -- serving up pre-rendered
tiles from disk is going to be significantly easier to scale than
serving up rendeered data from shapefiles, I think -- but this may just
be my lack of experience with serving data fast.

Regards,
--
Christopher Schmidt
MetaCarta