MapServer performance

[Ed McNierney]

Antti -

1 GB of RAM is not a lot for dealing with large raster files.  Could you
describe your hard disk subsystem in detail?  What kind of hardware are you
using to store the TIFF images?

     - Ed

-- 
Ed McNierney
President and Chief Mapmaker
Maps a la carte, Inc. / TopoZone.com
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
Phone: (978) 251-4242
Fax: (978) 251-1396
ed at topozone.com

> From: antti siukola <siukola.antti at GMAIL.COM>
> Reply-To: antti siukola <siukola.antti at GMAIL.COM>
> Date: Fri, 23 Mar 2007 11:11:18 +0200
> To: <MAPSERVER-USERS at LISTS.UMN.EDU>
> Subject: Re: [UMN_MAPSERVER-USERS] MapServer performance
> 
> Hi!
> 
> Thanks for the reply!
> 
> My tiff's are from 15M to 10G tiff tiles (about 500M each tile) and
> depending on the map theres the one 15M tiff or from 2 to 3 of the
> 500M tiles displayed (I have couple of map apps running on the
> server). It doesn't seem to matter how big the tiff's are since the
> performance is the quite the same. I also have the .shx files for my
> shape's.
> 
> The server doesn't get very much hit's since it's not an open for
> public application. I believe the average usage is about 1-10 users at
> the same time.
> 
> Hope this helps!
> 
> Antti S
> 
> On 3/21/07, Romolo Manfredini <romoloman at hotmail.com> wrote:
>> From: "antti siukola" :
>> 
>>> Oh, yes. I'm on linux with mapserver 4.8.4 and php mapscript. The
>>> server is quite new and powerful with dual xeon and 1024M of memory.
>>> Data sources are mostly SHP-files and few TABs for vector data and
>>> labels. The actual maps are .tif images. I'm using tiled tiff's and
>>> low-res images on upper scales.
>>> 
>> 
>> SHP and tiff files are typically bad beast to manage expecially if they are
>> big shape and big tiff, also dependig on file system type you may have some
>> performance issues related to locking and caching. (1 GB ram with large
>> files is not so much)
>> Also, do you have spatial index on your files (.shx) ?
>> Spatial index improve performances a lot.
>> May you tell me the size of your files and how many of them are involved in
>> a single map ?
>> 
>> Best Regards,
>> Romolo
>> 
>>