Hello, fellow mapnik users and/or developers. Recently I've stumbled upon strange performance issues when using Python bindings. After investigating a little I've came to a conclusion that rendering map from Python bindings is (at least) twice as slow as using C++ to do the same job. To check my assumptions, I've created simple test, which renders 250 images of size 768x768. Coordinates are being shifted by 0.01 degree for each image, so I'm going from somewhere near north France shore to somewhere near Cambridge. Aaanyway, just look in the source code, the idea is pretty simple -- http://bitbucket.org/mishok13/mapnik-perf-testing/src/ C++ code was compiled using following command: g++ -Wall -O2 -I/usr/include/freetype2 -I/usr/include/mapnik -lagg_pic -lmapnik render.cpp -o render 2>&1
So, the timings for these: C++ render: $ time ./render real 0m19.766s user 0m5.196s sys 0m0.636s Python render: $ time ./render.py real 0m52.883s user 0m22.445s sys 0m0.844s As you can see, results are not really satisfying. I'm still resisting to just simply use C++, as writing non-library C++ code hurts my feelings badly, so if anyone has any clues -- don't hesitate to share them with me. :) You could also run the tests on your computer and share the results. Some information about PC I've used for these tests: Latest Mapnik trunk checkout (revision 1288) Boost version 1.37 PostGIS version 1.3.3 Python 2.6 Latest UK extract from CloudMade (obviously :) ) All of this running on Ubuntu 9.04. -- Wbr, Andrii V. Mishkovskyi. I have the last page code of rocket launch program in NASA written in Lisp: ))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
