[GRASS-dev] v.what.rast speedup

[Hamish]

Hi,


I have run valgrind's callgrind profiler for v.what.rast.

results + screen dumps are here:
  http://bambi.otago.ac.nz/hamish/grass/dev/


to look at it in detail install kcachegrind and graphviz, then just
  kcachegrind <file>

(after un-gzipping the callgrind output files)


I added what I did as an example on the wiki debugging page:
  http://grass.gdf-hannover.de/wiki/GRASS_Debugging#Kcachegrind


quick summary of results:
  99.5% of the cost was taken by the dbf process, not v.what.rast
  (watching 'top' shows you the same)

  In the dbf process (#15561) about 1/3rd was taken by G_debug(),
  and about 1/2 was taken by G_debug() + G_strcasecmp()


Hamish


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