[mapserver-dev] Using PointZM by default

[Even Rouault]

On vendredi 1 mars 2019 01:14:34 CET Seth G wrote:
> Hi all,
> 
> There is a pull request [1] currently open to set USE_POINT_Z_M as ON by
> default. I recently made an update to this for the CMake build [2].
> 
> As Tamas and Julien-Samuel have pointed in the comments on the pull requests
> it may be better to simply use PointZM throughout MapServer by default, and
> remove this option altogether.
> 
> There are currently issues with MapScript bindings and testing where the
> output is not guarenteed due to the compile options and could lead to
> memory corruption issues.
> 
> Possible risks are breaking some tests (which can be updated), and reducing
> performance. I presume there is no easy way to measure performance between
> changes / releases?
> 
> Does anyone have any thoughts on reasons not to use PointZM by default
> throughout MapServer?

I'm +1 on enabling ZM unconditionaly. This is a topic I raised a few years 
ago.
I found this thread
https://lists.osgeo.org/pipermail/mapserver-users/2017-July/080102.html
where I did a small benchmark. ZM was 2% slower.

Even

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