[mapserver-users] testing mapserver large files rendering improvements

[Guillaume Sueur]

Hi,

I've just been doing few tests on mapserver trunk version to get an idea 
of how much the rendering of large shapefiles has been improved by 
paul's hacks on shx handler 
(http://blog.cleverelephant.ca/2008/04/see_30.html)

My shapefile is 1 208 668 features, 160 Mo for the .shp file itself with 
a .shx of 5.2 Mo

here are the times for a 5x5 km map to be drawn with shp2img, in PNG (no 
AGG)

NO QIX :
mapserv 5.0.2 : 0.680 s
mapserv trunk : 0.699 s (!)

WITH QIX :
mapserv 5.0.2 : 0.124 s
mapserv trunk : 0.027 s


it looks like if the improvement only appears with use of a .qix file, 
which is highly recommended but sometimes forgotten.
Has anyone had the same kind of experiment ?


By the way, I noticed that it doesn't seem mandatory anymore to write 
the mapfile's DATA statement without the .shp extension to make use of 
the .qix file, as the results are strictly identical on mapserver trunk 
if I write "streets.shp" or "streets". Can someone confirm that ?

Thanks

Guillaume