Performance hints please

[Eijnden, B. van den (Bart)]

One option could be generating overviews for your tiff files using gdaladdo.

See section 10 of the following HOWTO (Raster Display Performance Tips):

http://mapserver.gis.umn.edu/docs/howto/raster_data


Best regards,
Bart

-----Oorspronkelijk bericht-----
Van: UMN MapServer Users List
[mailto:MAPSERVER-USERS at LISTS.UMN.EDU]Namens Stephen Davies
Verzonden: donderdag 6 april 2006 10:04
Aan: MAPSERVER-USERS at LISTS.UMN.EDU
Onderwerp: [UMN_MAPSERVER-USERS] Performance hints please


G'day all.

Does anybody have a howto on Mapserver performance enhancement?

My particular environment of interest is a relatively small set of 
geometries in a PostGIS database and a collection of geotiff aerial 
photography images onto which I overlay the geometries.

The geometries are fully indexed, relatively static and vacuum analyzed 
every night.

One of the options that users have is to request a "movie" of up to 20 
frames; each of which consists of a background raster plus up to about 
five circular geometries, about five points and maybe ten other 
lines/polygons.

The amount of geometry involved is so small, the bottleneck has to be 
the raster processing. The images are 2m/pixel and are typically 20 - 
150 Mb each. The frame extents include most if not all of an image so 
tiling does not seem relevant.

I have specified 80% JPEG as the output to minimise final image size and 
this seems successful (at least in terms of size and hence download 
time)

I am looking for ways to reduce the time taken in the image generation 
phase.

TIA,
Stephen Davies

 =======================================================================
This email is for the person(s) identified above, and is confidential to
the sender and the person(s).  No one else is authorised to use or
disseminate this email or its contents.

Stephen Davies Consulting                            Voice: 08-8177 1595
Adelaide, South Australia.                             Fax: 08-8177 0133
Computing & Network solutions.                       Mobile:0403 0405 83


Disclaimer
************************************************************************
Aan dit bericht kunnen geen rechten worden ontleend. Dit bericht is
uitsluitend bestemd voor de geadresseerde. Als u dit bericht per abuis
hebt ontvangen, wordt u verzocht het te vernietigen en de afzender te 
informeren. Wij adviseren u om bij twijfel over de juistheid of de 
volledigheid van de mail contact met afzender op te nemen.

This message shall not constitute any rights or obligations.
This message is intended solely for the addressee.
If you have received this message in error, please delete it and
notify the sender immediately. When in doubt whether this message
is correct or complete, please contact the sender.
************************************************************************