Michael Hoffman wrote:
Just out of curiosity, I was wondering if anyone has
compiled Python 2.4 with the Intel C Compiler and its
processor specific optimizations. I can build it fine
with OPT="-O3" or OPT="-xN" but when I try to combine
them I get this as soon as ./python is run:
"""
case $MAKEFLAGS in \
*-s*) CC='icc -pthread' LDSHARED='icc -pthread -shared' OPT='-DNDEBUG
-O3 -xN' ./python -E ./setup.py -q build;; \
*) CC='icc -pthread' LDSHARED='icc -pthread -shared' OPT='-DNDEBUG -O3
-xN' ./python -E ./setup.py build;; \
esac
'import site' failed; use -v for traceback
Traceback (most recent call last):
File "./setup.py", line 6, in ?
import sys, os, getopt, imp, re
File "/usr/local/src/Python-2.4/Lib/os.py", line 130, in ?
raise ImportError, 'no os specific module found'
ImportError: no os specific module found
make: *** [sharedmods] Error 1
"""
Also, if I run ./python, I have this interesting result:
"""
$ ./python
'import site' failed; use -v for traceback
Python 2.4 (#34, Mar 12 2005, 18:46:28)
[GCC Intel(R) C++ gcc 3.0 mode] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.builtin_module_names
('__main__', '__builtin__', '__builtin__', '__builtin__', '__builtin__',
'__builtin__', '__builtin__', '__builtin__', '__builtin__',
'__builtin__', '__builtin__', '__builtin__', '__builtin__',
'exceptions', 'gc', 'gc')
"""
Whoa--what's going on? Any ideas?
Further investigation reveals that the function that sets
sys.builtin_module_names sorts the list before turning it into a
tuple. And binarysort() in Objects/listobject.c doesn't work when
optimized in that fashion. Adding #pragma optimize("", off)
beforehand solves the problem. Why that is, I have no idea. Is
anyone else curious?
Also, if anyone is looking for a way to squeeze a little extra time
out of the startup, perhaps sorting the list at build-time,
rather than when Python starts would be good. Although probably
not worth the trouble. ;-)
--
Michael Hoffman
--
http://mail.python.org/mailman/listinfo/python-list
