Re: Faster StrNCpy

Mark,

On 9/29/06 2:59 PM, "mark(at)mark(dot)mielke(dot)cc" <mark(at)mark(dot)mielke(dot)cc> wrote:

> Here are results over 64 Mbytes of memory, to ensure that every call is
> a cache miss:

On my Mac OSX intel laptop (Core Duo, 2.16 GHz, 2GB RAM, gcc 4.01):

Luke-Lonergans-Computer:~/strNcpy-perf-test lukelonergan$ gcc -O3 -std=c99
-DSTRING='"This is a very long sentence that is expected to be very slow."'
-DN="(1024*1024)" -o x x.c y.c strlcpy.c ; ./x
/usr/bin/ld: warning multiple definitions of symbol _strlcpy
/var/tmp//cc1eMVq7.o definition of _strlcpy in section (__TEXT,__text)
/usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libSystem.dylib(strlcpy.So)
definition of _strlcpy
NONE: 416677 us
MEMCPY: 5649587 us
STRNCPY: 5806591 us
STRLCPY: 12865010 us
LENCPY: 17801485 us
Luke-Lonergans-Computer:~/strNcpy-perf-test lukelonergan$ gcc -O3 -std=c99
-DSTRING='"Short sentence."' -DN="(1024*1024)" -o x x.c y.c strlcpy.c ; ./x
/usr/bin/ld: warning multiple definitions of symbol _strlcpy
/var/tmp//ccOZl9R6.o definition of _strlcpy in section (__TEXT,__text)
/usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libSystem.dylib(strlcpy.So)
definition of _strlcpy
NONE: 416652 us
MEMCPY: 5830540 us
STRNCPY: 6207594 us
STRLCPY: 5582607 us
LENCPY: 7887703 us
Luke-Lonergans-Computer:~/strNcpy-perf-test lukelonergan$ gcc -O3 -std=c99
-DSTRING='""' -DN="(1024*1024)" -o x x.c y.c strlcpy.c ; ./x
/usr/bin/ld: warning multiple definitions of symbol _strlcpy
/var/tmp//ccBUsIdR.o definition of _strlcpy in section (__TEXT,__text)
/usr/lib/gcc/i686-apple-darwin8/4.0.1/../../../libSystem.dylib(strlcpy.So)
definition of _strlcpy
NONE: 417210 us
MEMCPY: 5506346 us
STRNCPY: 5769302 us
STRLCPY: 5424234 us
LENCPY: 5609338 us

- Luke