#2033: Moving g.pnmcomp to lib/display to improve render performance of wxGUI
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Reporter: huhabla | Owner: grass-dev@…
Type: enhancement | Status: closed
Priority: major | Milestone: 7.0.0
Component: wxGUI | Version: svn-trunk
Resolution: worksforme | Keywords: display, Python, multiprocessing
Platform: All | Cpu: All
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Changes (by huhabla):
* status: new => closed
* resolution: => worksforme
Comment:
My conclusion:
* Moving the code of g.pnmcomp, d.vect, d.rast ... d.* into the display
library for speedup reason is not meaningful. It might be meaningful when
we decide to implement the d.* modules as Python modules that communicate
with the wx display using sockets instead of files to call the rendering
backend. Well, the same can be achieved by implementing python wrapper
modules around the display modules ... so it might be not meaningful at
all.
* The current wxGUI rendering approach using PPM and g.pnmcomp seems to
be the most efficient considering the fact that the cairo driver is not
yet available in the windows version of grass7. It seems to me that using
PIL will not provide a large speedup benefit over g.pnmcmop especially for
large images.
* A small speedup can be achieved when calling the d.* modules in
parallel in the GUI, especially when several maps need to be re-rendered.
* IMHO the only way to speedup the rendering is to make d.rast and d.vect
faster.
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Ticket URL: <http://trac.osgeo.org/grass/ticket/2033#comment:10>
GRASS GIS <http://grass.osgeo.org>
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