Date: Fri, 9 Dec 2005 10:37:04 +1030 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Michael Vince <mv@roq.com> Cc: freebsd-performance@freebsd.org, "Gustavo A. Baratto" <gbaratto@superb.net> Subject: Re: new benchmarks. WAS: FreeBSD MySQL still WAY slower than Linux Message-ID: <20051209000704.GA80362@wantadilla.lemis.com> In-Reply-To: <438FB036.3000804@roq.com> References: <04f401c5f630$b9af6570$6450fb40@guinness> <438FB036.3000804@roq.com>
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On Friday, 2 December 2005 at 13:23:50 +1100, Michael Vince wrote:
> It would be good to actually see the Linux performance on the exact same
> hardware, all we ever see is how it is on FreeBSD.
>
> MySQL has very frequent use of queries of the system time and is
> well known in FreeBSD to be slower because its more expensive to
> call compared to Linux, which has less precision time.
I've heard this claim again and again, and I intend to look at it when
I have time. I find it difficult to believe that this alone could
explain the sometimes horrendous performance differences (3 to 1) that
have been reported.
Can somebody tell me:
1. How many calls there are per second?
2. Where they're coming from? This would involve profiling, of
course.
Greg
--
See complete headers for address and phone numbers.
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