[mapserver-users] high memory usage on map draw

[Daniele Debernardi]

Hi,
with mapserver trunk version (but i think with others too) I have to 
generate very big map to be imported in a pdf file.
I use php mapscript to generate maps with 300 dpi for an A1/A0 pdf page 
or bigger.
This mean that the map has dimensions like 15000x25000 pxl and when I 
call the MapObj->draw method i get this error:

PHP Warning:  mapObj::draw(): [MapServer Error]: agg2CreateImage(): 
mapagg.cpp: 708: Out of memory allocating 1550851152 bytes.

Map server is configured with the AGG/PNG driver with imagemode RGBA.

Is it normal that need so much memory to generate the image?

I already tryied the php ini_set memory_limit but with a limit of 2048M 
i still have some problem with memory.

I checked other possible outputs but generating maps in pdf through 
Cairo driver but doc says that polygons filled with symbols are not 
supported, and for that reason I cant use it.
SVG output has some limitations too like line drawn without symbols or 
pixmap symbols not supported.

Is there a better way to generate so big map images and imported in a 
pdf file?

Hope you guys can help me.

Daniele