[mapserver-users] huge performance problem with ECW

[Bart van den Eijnden]

Hi all,

I have a big problem when I zoom in to a high level on a big ECW file. The 
file is 4 Gb. I also have the same file in tiles of approximately 1 Gb.

When the boundingbox is (units is meters):

bbox=171760,449736,173257,451421 (So approximately 1500 x 1700 m)
The image takes less than 1 second to be created and memory usage on the 
server of mapserv.exe is 6 Mb.

bbox=171760,450736,172257,451421 (So approximately 500 x 700 m)
The image takes more than 34 second to be created and memory usage on the 
server of mapserv.exe is more than 50 Mb.
WITHOUT TILES: almost 100 Mb memory and more than 50 seconds to render 
image!!

Can anybody help? Is this normal behaviour?

--- WMS ---

I have also noticed some minor problems with the WMS interface:
-when I include an SRS in my WMS request for a raster layer, I get a 
projection error:
msProcessProjection(): Projection library error. no system list, errno: 2
when I leave out the SRS I get the image. Although according to the WMS 
capabilities mapserver should be able to render my raster (which is in 
EPSG:28992, the same as the SRS I request) in EPSG:28992. Because OGC WMS 
layers inherit the SRS and boundingboxes from their parent layers, i.e. 
from the bounding box and SRS present in the mapfile.
-when I request for capabilities without a version (1.1.0), IE does not 
recognize the content-type. The content-type is empty in the open/save 
dialog which comes to the screen. Opera recognizes the content-type, but 
the filename ends with exe which causes some "security" problems (filename: 
mapserv.exe). In IE the filename is just mapserv. Is there a way to 
overcome this?

Best regards,
Bart