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Date:      Sun, 7 May 2006 20:57:21 +0100 (BST)
From:      Robert Watson <rwatson@FreeBSD.org>
To:        Kris Kennaway <kris@obsecurity.org>
Cc:        performance@freebsd.org, current@freebsd.org, csjp@FreeBSD.org
Subject:   Re: Fine-grained locking for POSIX local sockets (UNIX domain sockets)
Message-ID:  <20060507205627.B46997@fledge.watson.org>
In-Reply-To: <20060507191641.GA1851@xor.obsecurity.org>
References:  <20060506150622.C17611@fledge.watson.org> <200605071949.54978.hadara@bsd.ee> <20060507190844.K46997@fledge.watson.org> <200605072200.42529.hadara@bsd.ee> <20060507191641.GA1851@xor.obsecurity.org>

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> On Sun, May 07, 2006 at 10:00:41PM +0300, Sven Petai wrote:
>
>> The results in my mail were mean values over 2 runs,
>> only once did I see really huge (more than 10%) differences between several
>> subsequent runs with same settings, this case was clearly mentioned in the results.
>
> FYI, 2 is not really enough, you should do at least 10 repetitions of each 
> test to reduce variance (which can be a lot, despite what you saw!) and so 
> that differences between them can be accurately estimated.  Ministat is 
> really helpful for this.

Typically, I do 12 runs of supersmack in each configuration, and discard the 
first 2 runs in which the cache and scheduler (etc) are still settling, as I'm 
interested in the steady state.

Robert N M Watson



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