[Python-Dev] xreadline speed vs readlines_sizehint
Tim Peters
tim.one@home.com
2001年1月15日 01:35:05 -0500
[Timmy]
> At this point I'm +0.5 on the idea of fileobject.c using
> ms_getline_hack whenever HAVE_GETC_UNLOCKED isn't available.
[NeilS, from Wednesday]
> Compare ms_getline_hack to what Perl does in order speed up IO.
Believe me, I have <wink>.
> I think its worth maintaining that piece of relatively portable
> code given the benefit. If the code has to be maintained then it
> might was well be used. If we find a platform the breaks we can
> always disable it before the final release.
Given that hearty encouragement, and the utterly non-scary results so far, I
just checked in a new scheme:
On a platform with getc_unlocked():
By default, use getc_unlocked().
If you want to use fgets() instead, #define USE_FGETS_IN_GETLINE.
[so motivated people can use fgets() instead if it's faster
on their platform]
On a platform without getc_unlocked():
By default, use fgets().
If you don't want to use fgets(), #define DONT_USE_FGETS_IN_GETLINE.
[so if we stumble into a platform it fails on between
releases, the user will have an easy time turning it off
themself]