[mapserver-users] 3D / 2.5D / Coordinates with Z and GEOMETRY Type in WFS

[Daniel Hardes]

Do we need more testing or could "USE_POINT_Z_M = ON" the default in the next release? 

>     Even Rouault <even.rouault at spatialys.com> hat am 30. Juni 2017 um 16:40 geschrieben:
> 
>     On vendredi 30 juin 2017 09:59:30 CEST Daniel Morissette wrote:
>     > On 2017-06-30 9:50 AM, Even Rouault wrote:
>     > > I'm wondering if we shouldn't revisit the decision to have USE_POINT_Z_M
>     > > disabled by default. This is often annoying.
>     > >
>     > > Apparently, adding USE_POINT_Z_M defaulting to OFF was driven by
>     > > performance reasons per
>     > > https://github.com/mapserver/mapserver/issues/1244 . But this was 12
>     > > years ago. Perhaps with recent hardware the performance difference isn't
>     > > that big. The ticket unfortunately doesn't contain a test case to bench
>     > > (likely lots of lines/polygons, or large lines/polygons to render). If
>     > > the perf difference is still there, a more involved change would be
>     > > indeed to move the z and m components into separate arrays.
>     >
>     > #1244 refers to #1224 which is using the gmap demo mapfile... which is a
>     > relatively small dataset, so it should be easy to verify if the issue is
>     > still relevant on more recent hardware using gmap or probably any other
>     > dataset.
>     >
>     > https://github.com/mapserver/mapserver-import/issues/1224
>      
>     OK, I downloaded
>     http://dl.maptools.org/dl/gmap-ms46.tar.gz
>     (not sure if there's a more uptodate version of it).
>     Added the necessary MAP and SYMBOLSET keywords in the mapfile and symbolset file.
>      
>     With master, compiled in Release (-O3)
>      
>     and the following Python mapscript bench.py
>     {{{
>     import mapscript
>      
>     for i in range(200):
>     map = mapscript.mapObj('gmap75.map')
>     img1 = map.draw()
>     }}}
>      
>     I ran it 10 times consecutively with each config and took the smallest time ("real" figure)
>      
>     With USE_POINT_Z_M=OFF
>      
>     time python bench.py
>      
>     real 0m4.167s
>     user 0m3.964s
>     sys 0m0.200s
>      
>     With USE_POINT_Z_M=ON
>      
>     time python bench.py
>      
>     real 0m4.252s
>     user 0m3.972s
>     sys 0m0.260s
>      
>     So USE_POINT_Z_M=ON is 2% slower than OFF
>      
>      
>     On a recent (~ 1 year old) laptop with a
>     Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz
>      
>     Even
>      
>     --
>     Spatialys - Geospatial professional services
>     http://www.spatialys.com
> 


 

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