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
--
Daniel Morissette
Mapgears Inc
T: +1 418-696-5056 #201
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