James,
Unless you have already done so, optimizing your mapfile and data will
yield improvements in map rendering speed that would probably be more
substantial than switching to 64 bit builds. Of course, under 100 ms
per map draw doesn't sound too bad so you have probably implemented
most optimizations already.
The basic optimizations I can think of quickly are:
* use tiled, indexed shape files for vector data and tiled/overviewed
tif files for raster data
* eliminate all unused attributes from the dbf files
* use fastcgi
* draw smaller maps
Other optimizations might include:
* use a faster operating system (linux) with a light-weight web server
(lighttpd is typically faster than apache for instance)
* use scale ranges to limit the data that has to be drawn at any given
scale
* precompute attribute values to avoid non-trivial class expressions
* use RAM disks for your data, or at a minimum faster hard drives
* using preset scales and simplifying/generalizing your data for each
scale so you have the minimum amount of data to process
* eliminate extraneous cartography (draw less)
* eliminate extraneous data (that lies outside of the region of
interest)
* use a tiled client such as openlayers, prerender your static data
into tiles and overlay only dynamically changing data using either
map draws or vectors
On 16-Jun-08, at 1:46 PM, Léveillé, James wrote:
Hi,
We've been using MapServer for a while. It has been used to produce
maps for the "Inforoutière", the official source of all the
information needed to plan safe trips on Québec’s road network,
whatever the season.
It has been running on Windows 2003 (32 bits) for over a year.
At the beginning, many "stress tests" were realised.
We were able to generate around 12 maps / second.
But now, due to the popularity of the site, this seems not to be
enough in special occasions, such as during a snow storm.
The bottle neck seems to be the CPU.
One of the few options we were looking at is the possibility of
using a 64 bits version of MapServer (on a 64 bits OS of course).
My question is simple : has any one tested a 64 bits version ? Can I
expect a better performance ? Is there a 64 bits version available
for download (I've been using the MS4W Windows binary distribution
version) ?
Thanks in advance.
______________________________________________________
JAMES LÉVEILLÉ
Service des systèmes de Mission
Direction des technologies de l'information
Ministère des Transports du Québec
5833, boul. Pierre-Bertrand, 2ième étage
Québec (Québec) G2K 1K7
Téléphone: (418) 380-2005 poste 227
Télécopieur: (418) 644-6653
[EMAIL PROTECTED]
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__________________________________________
Paul Spencer
Chief Technology Officer
DM Solutions Group Inc
http://www.dmsolutions.ca/
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