[mapserver-users] Multi layer/class : performance

[Stephen Kelly]

Alexandra,

Hi, if you are really interested we have developed a tool here to create tiles for one of our mapping tools, and we generate about 100,000 very large mapserver maps per day and it would be easy for us to do some timing tests for you of both ways and to see which way is the fastest. 

One thing we have discovered is that what you do to your shape files is generally more important for speed, than what you do to your map files.

Although we do not rely on min/max scale and choose manually at what zoom what information is shown, and have that in separate map files, as that is the fastest (for what we need to do).

If you have any specific data / map files that you wanted me to test it on- I am sure that we could accommodate that.

We can do 16,000 images one way, 16,000 the other way and time each image and see which way works.

Thanks

Stephen Kelly 
www.Peepel.com 

-----Original Message-----
From: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Alexandre Dube
Sent: Friday, 12 June 2009 11:21 PM
To: MAPSERVER USERS
Subject: [mapserver-users] Multi layer/class : performance

Hi,

  I wonder which of theses two cases is better :

  CASE 1 : Multi layer :
  Define one layer per scale with minscale and maxscale, each having one 
set of classes.

  CASE 2 : One layer :
  Define one layer only with one set of classes per scale.  The classes 
would have the minscale and maxscale properties.

  I find the second case "cleaner" but I'm wondering about performance.  
Would it be slower to draw the bottom classes ( the ones with minscale 
properties only, for example) ?

Thanks,

-- 
Alexandre Dubé
Mapgears
www.mapgears.com

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