I don't think it is a specifically Macports issue. On my (oldish) Macbook pro the system python & numpy with
/usr/bin/python bench2.py takes 15 s while the 32/64 bit numpy I built took 52 s No difference between 32 and 64 bit (i.e.python-32 instead of python-64) Same ratio on my Mac Pro: 29s vs 10s. my numpy used flags in /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/config/Makefile OPT= -DNDEBUG -g -O3 BASECFLAGS= -arch i386 -arch x86_64 -isysroot / -fno-strict-aliasing -fno-common -dynamic LDFLAGS= -arch i386 -arch x86_64 -isysroot / -g system numpy presumably uses flags from /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/config/Makefile OPT= -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes EXTRA_CFLAGS= -DENABLE_DTRACE BASECFLAGS= -fno-strict-aliasing -fno-common -dynamic LDFLAGS= -Wl,-F. --George. > > On 8 December 2010 07:21, Konrad Hinsen <[email protected]> wrote: >> On 07.12.2010, at 21:58, Konrad Hinsen wrote: >> >>> Somewhat by accident I noticed an enormous speed difference in basic NumPy >>> operations between my MacPorts installation (py26-numpy) and the NumPy >>> 1.5.1 binaries from the NumPy sourceforge site used with MacPython 2.6, >>> also downloaded as a binary. >>> >>> ~/projects/solar_system> /usr/local/bin/python bench2.py >>> CPU time: 16 s >>> ~/projects/solar_system> /opt/local/bin/python bench2.py >>> CPU time: 45 s >> >> Update: I profiled both runs using Shark, and found that when using the >> MacPorts version, 57% of the total time is spent in function feclearexcept. >> In the MacPython run, this function doesn't even show up. This makes me >> suspect that the difference is in the handling of floating point numbers, >> specifically floating-point exceptions. >> >> Konrad. >> >> _______________________________________________ >> macports-users mailing list >> [email protected] >> http://lists.macosforge.org/mailman/listinfo.cgi/macports-users >> > _______________________________________________ macports-users mailing list [email protected] http://lists.macosforge.org/mailman/listinfo.cgi/macports-users
