[mapserver-users] performance of our installation is way off

[Ed McNierney]

Brian -

Here are some quick thoughts:

1. Are you using shptree to generate spatial indexes?  If not, do this
first.
2. Depending on your data organization, you may want to use shptree to
index the index file created by tile4ms.

Did you do something already?  I took at look at the URL you provided,
and I'm seeing map updates in 2-3 seconds.

	- Ed

Ed McNierney
Chief Mapmaker
TopoZone.com
ed at topozone.com
(978) 251-4242


-----Original Message-----
From: Brian Hill [mailto:bhill at nextbus.com]
Sent: Wednesday, October 24, 2001 1:43 PM
To: mapserver-users at lists.gis.umn.edu
Subject: [mapserver-users] performance of our installation is way off


It is taking 15 to 20 seconds to render a map on a fast Linux/Intel 
system with all binaries and data local, which is off by a factor of 5 
or more from what I was expecting.  For example, hit:

http://skip.nextbus.com/cgi-bin/imap/mapper?wid=.03&ht=.03&lat=37&lon=-1
22

I used tile4ms from a 3.5 nightly distribution to index all the Tiger 
shape file data for California. Otherwise, the system is a 3.3.012 
system.  The .map file has been pared pretty hard.

Does anyone know of performance trouble-shooting techniques for the 
mapserver system or common build/app/data problems that can severely 
impact performance?

In an earlier post, data thinning, pre-projection and spatial indexes 
were mentioned, but these are just buzzwords to me.  I haven't found 
directions for actually applying these techniques in the documentation.

Thanks for any tips on how to narrow the problem down or fix it.

Brian Hill
Sr. Software Engineer
NextBus Information Systems
(510)420-3122