From: | "Sergey E(dot) Koposov" <math(at)sai(dot)msu(dot)ru> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | mark(at)mark(dot)mielke(dot)cc, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Faster StrNCpy |
Date: | 2006-10-02 20:18:34 |
Message-ID: | Pine.LNX.4.64.0610030011410.12197@lnfm1.sai.msu.ru |
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Lists: | pgsql-hackers pgsql-patches |
On Mon, 2 Oct 2006, Tom Lane wrote:
> "Sergey E. Koposov" <math(at)sai(dot)msu(dot)ru> writes:
>> Just the test on IA64 (Itanium2, 1.6Ghz, 8Gb memory). The results seem to
>> be quite different:
>
> What libc are you using exactly? Can you try it with the unrolled
> strlcpy I posted?
glibc 2.3.5 , gcc 3.4.4
my results were obtained already with your unrolled version (but when I
first ran it with the 'default' strlcpy the results were the same).
>
> In glibc-2.4.90, there seem to be out-of-line assembly code
> implementations of strncpy for: sparc64 sparc32 s390x s390 alpha ia64
> and an inlined assembler version for i386. So the x86_64 case is
> nearly the only popular architecture that doesn't seem to have
> a hand-hacked implementation ... which throws some doubt on Mark's and
> my results as possibly not being very representative.
Regards,
Sergey
*******************************************************************
Sergey E. Koposov
Max Planck Institute for Astronomy/Sternberg Astronomical Institute
Tel: +49-6221-528-349
Web: http://lnfm1.sai.msu.ru/~math
E-mail: math(at)sai(dot)msu(dot)ru
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