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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