[issue6713] Integer & Long types: Performance improvement of 1.6x to 2x for base 10 conversions
Mark Dickinson
report at bugs.python.org
Thu Sep 10 17:05:50 CEST 2009
Mark Dickinson <dickinsm at gmail.com> added the comment:
Thanks for those results, Collin.
> By benchmark should be reproduced on a 64 bits CPU with 2^15 and 2^30
> bases for the long type.
On OS X 10.6 (64-bit Python non-debug non-framework build with gcc 4.2
from Apple, 30-bit long digits, straight ./configure && make), Victor's
benchmark gives me the following results:
original = 1023.9 ms (best of 10 runs)
patched = 1005.3 ms (best of 10 runs).
- a speedup of about 1.85%. So it looks as though x86_64 doesn't benefit
to the same extent that 32-bit does. Presumably that's because gcc-4.2 is
unable or unwilling to turn a 64-bit by 64-bit division with a constant
dividend of 10**9 into a multiplication; I don't know whether using a
later gcc would make a difference.
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