.readline() - VERY SLOW compared to PERL
Erno Kuusela
erno-news at erno.iki.fi
Thu Nov 16 13:49:12 EST 2000
>>>>> "Fluffy" == Swapped Out Fluffy <ftc at meowing.net> writes:
Fluffy> The standard readline() is relatively slow because it uses
Fluffy> a very conservative, safe, portable approach. It reads
Fluffy> the file one character at a time, meaning that your C
Fluffy> library and/or kernel has lots of work to do.
no wonder it is slow!
a couple of speedup possibilities come to mind:
* use getc_unlocked & friends if available, so that there's no need
to lock the file object on each call. (susv2 requires the regular
versions to do locking,
<URL:http://www.opennc.org/onlinepubs/7908799/xsh/getc_unlocked.html>)
* use the getline function on gnu platforms.
<URL:http://www.cs.utah.edu/dept/old/texinfo/glibc-manual-0.02/
library_11.html#SEC124>
this would add a few #ifdefs, but the performance increase could
be worth it.
-- erno
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