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Compiler Notes
Dane Springmeyer edited this page Apr 26, 2015
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Random notes on compiler results in terms of runtime speed and library size
Mapnik 2.1.x branch with clang++ 3.3 (trunk 177655)
on OS X 10.7
- -Os: libmapnik.dylib is
16.2
MB and tests run in3.9s
- -O2: libmapnik.dylib is
12.8
MB and tests run in3.7s
- -O3: libmapnik.dylib is
12.5
MB and tests run in3.7s
OS X duel core: 2.8 GHz Intel Core i7
At https://github.com/mapnik/mapnik/commit/66ad95cbbe755c9e905406b6f1227b06b24f60e1
$ clang++ -v
Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)
Target: x86_64-apple-darwin14.3.0
Thread model: posix
$ source bootstrap.sh && time make
real 16m31.347s
user 29m1.430s
sys 1m7.557s
rebuilding with ccache v3.2.1
(first run):
$ ./configure CXX="/Users/dane/.homebrew/bin/ccache clang++"
$ time make
real 11m3.394s
user 28m36.684s
sys 1m36.502s
Second run:
make clean
time make
real 0m41.734s
user 0m41.007s
sys 0m15.724s