Problem trying to serve large .tif dataset

[Shawn Wallbridge]

On 13-Oct-05, at 5:58 PM, Glen Thompson wrote:

> Hi,
>
> I am having difficulties with mapserver 4.6 generating output with a
> large .tif dataset.  I'm attempting to setup a large dataset to be 
> served
> up via WMS.
>
> I have a .tif dataset of approximately 2000 .tif files totalling around
> 160k pixels by 375k pixels.  Each tif image is 5000 x 5000 pixels.
>
> <snip>

> When I request the entire bbox for the dataset, the mapserver.exe 
> process
> runs for about 8 minutes and then seems to crash or error out or
> something.  I don't know nor can't find any logfiles to see what is
> happening.
>
> Has anyone had any success dealing with datasets of this size?  If so, 
> how
> have you implemented them?
>
> Any help/advise would be greatly appreciated.
>
> Thank you,
> Glen Thompson
>

Any chance you are hitting 2GB of memory and then it's crashing? From 
the sounds of it you are using Windows, and in Windows 2000 a single 
process can't access more than 2GB of memory. For anything higher than 
2GB, you either need Win2K AS  or WinXP with the /3GB memory tunning. 
But with each, you need to run a small binary called (IIRC) 
imagecfg.exe against the executable file that is being run. That will 
enable what's called '3GB memory tuning'. Their is a knowledge base 
article about Windows and Memory...

http://www.microsoft.com/whdc/system/platform/server/PAE/PAEmem.mspx

shawn