[Mapserver-users] Max number of layers craps out at about 295

[Pericles S. Nacionales]

Stephen,

You only need to change MS_MAXLAYERS to increase your layer #'s.  You
don't have to touch MS_MAXCLASSES and you shouldn't really touch
MS_MAXCOLORS.

I think MS_MAXCLASSES used to have a value of 50 but when I checked my
map.h yesterday it was at 250.  How many classes per layer do you
define?  I'd say you can lower this value if you need to.

As for MS_MAXCOLORS, the default value is 256.  I wouldn't touch it. 
Back in the days of MapServer 3.x this was the maximum # of colors
MapServer can support--the number of colors in the color table (look-up
table) associated with the input/output image.  I'd like to think that
this still applies to colormapped output in version 4.  I'd say leave
the default value as it is.

So, why not try these value and change your MS_MAXCLASSES if necessary:
#define MS_MAXCOLORS 256
#define MS_MAXCLASSES 50
#define MS_MAXLAYERS 700

Good luck!
-Perry N.

On Fri, 2004-02-13 at 10:32, Stephen Clark wrote:
> Pericles,
> 
> I chose the number 700 for each of the following :
> 
> #define MS_MAXCOLORS 700
> #define MS_MAXCLASSES 700
> #define MS_MAXLAYERS 700
> 
> 
> because I thought that each LAYER needed the same number of CLASSES and
> COLORS.
> 
> So can I assume that if I have about 3 classes per layer then I can use the
> following:
> 
> #define MS_MAXCOLORS 128
> #define MS_MAXCLASSES 128
> #define MS_MAXLAYERS 700
> 
> or perhaps a number less than 128?
> 
> I will try out this option and recompile MS with the above specs.
> 
> thanks
> Stephen
> 
> 
> ----- Original Message ----- 
> From: "Pericles S. Nacionales" <nacional at cbs.umn.edu>
> To: "Stephen Clark" <stephen.clark at focus.ca>
> Cc: <mapserver-users at lists.gis.umn.edu>
> Sent: Thursday, February 12, 2004 6:17 PM
> Subject: Re: [Mapserver-users] Max number of layers craps out at about 295
> 
> 
> > Stephen,
> >
> > I have a mapfile with more than 300 layers and it works just fine.  I
> > don't know what your exact situation is but you can't possibly be using
> > all 700 layers at once, can you?  I have noticed that you also changed
> > your MAXCLASSES to 700 and MAXCOLORS to 700.  Why?  Do you really need
> > to specify that many classes in a layer?  Try lowering the MAXCLASSES
> > and putting MAXCOLORS back to 256.
> >
> > Like I said, I don't really know what your situation is but you might
> > need to rethink how you'd accomodate all those layers in MapServer.  Are
> > each of the layers so unique that you can't combine (union, merge,
> > whatever) them?
> >
> > One more thing, are you sure that 295 is the max layers that your
> > mapserv program can display, or is it that layer #295 has problems?
> > With that many layers, debugging can't possibly be fun.
> >
> > OK, I promise this is the last thing... since your error message isn't
> > sufficiently detailed. I used to get a similar error message which
> > turned out to be due to corrupt shptree indices (this was back in the
> > 3.3/3.4 days but you never know).  Do you have .qix files?  Try moving
> > them out of the way.
> >
> > Good luck!
> > -Perry N.
> >
> > PS: Does your web server's error log say anything about this?
> >
> >
> > On Wed, 2004-02-11 at 17:27, Stephen Clark wrote:
> > > Hi all,
> > >
> > > I am trying to get the max number of layers that MS will read from a
> > > *.map file to be 500 or more.
> > >
> > > Once I exceed about 295 layers the MAP file will not be displayed.
> > >
> > > The error I get is 'The Memory could not be "read".' with some hex
> > > codes displayed.
> > >
> > > I have attached my "map.h" file as reference.
> > > Is there some other file that have to modify to be able to increase
> > > the number of layers?
> > >
> > > thanks
> > > Stephen
> >
> >
> >
> > _______________________________________________
> > Mapserver-users mailing list
> > Mapserver-users at lists.gis.umn.edu
> > http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
> >
> 
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