MapServer performance

[antti siukola]

Ed

Of course. I understand. Unfortunately I am forced to develop these
applications in an environment where I have no control over what
hardware I have and can't do nothing about it. So, if there's any
just-works kind of things I can do I would appreciate it. However
thank you very much for your time and effort.

Cheers!

Antti S


On 3/23/07, Ed McNierney <ed at topozone.com> wrote:
> Antti -
>
> Well, then that would be a good thing to learn about if you want to
> understand your system performance.  "RAID stack" is a pretty generic
> description, covering several different disk storage strategies, and
> covering both IDE and SCSI drives with various interface channels.  Reading
> from a parallel IDE 5,400 RPM RAID 1 system can be several times slower than
> reading from a SAS 15K RPM RAID 5 array!
>
> If you're going to optimize performance, find out more about your disk
> subsystem.  Your hard disks are the slowest things in your computer.  If you
> want to speed things up, it makes sense to see whether the slowest hardware
> in your system is a bottleneck before you start looking elsewhere.
>
>      - 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>
> > Date: Fri, 23 Mar 2007 18:14:04 +0200
> > To: Ed McNierney <ed at topozone.com>
> > Cc: <MAPSERVER-USERS at lists.umn.edu>
> > Subject: Re: [UMN_MAPSERVER-USERS] MapServer performance
> >
> > Hi!
> >
> > The tiff's are stored on a RAID stack on the same server and the
> > filesystem is ext3. I don't have very detailed description to give
> > since I'm not administrating the server or have ever even seen it :)
> >
> > Antti S
> >
> > On 3/23/07, Ed McNierney <ed at topozone.com> wrote:
> >> 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
> >>>>
> >>>>
> >>
> >>
>
>