Date: Tue, 01 Jan 2008 23:51:35 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-performance@freebsd.org Subject: Re: mysql scaling questions Message-ID: <fleg5o$daq$1@ger.gmane.org> In-Reply-To: <20080101122038.S9795@delplex.bde.org> References: <20071201205609.GA54238@harmless.hu> <200712012108.lB1L8qAd005766@lava.sentex.ca> <20071201211012.GA55519@harmless.hu> <20071201122122.S884@192.168.1.107> <20071204130810.GA77186@harmless.hu> <47779AA7.2060801@FreeBSD.org> <20071230132451.GA61295@harmless.hu> <47779EBC.5020900@FreeBSD.org> <20071230134354.GA63555@harmless.hu> <4777A65C.8020406@FreeBSD.org> <20071230141118.GA67574@harmless.hu> <4777AB9C.1010003@FreeBSD.org> <flb6bp$8kq$1@ger.gmane.org> <20080101122038.S9795@delplex.bde.org>
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[-- Attachment #1 --] Bruce Evans wrote: > FreeBSD has more layers, with less optimization in each layer. Normally > this doesn't matter, since everyone knows that syscalls are expensive > and avoids them :-). My point is that the majority of applications are written for Linux and they are both syscall-intensive and faster there, so maybe something can be done in FreeBSD. > No Pipe-based Context Switching? That should be included in benchmarks to > show FreeBSD slowness :-), since it is affected by both slow syscalls and > slow context switches. Unfortunately, I found out this one on my own application. > Um, execl and process creation are not syscall-intensive. They take about > 1 syscall each. Yes, in what amounts to a tight loop. They don't try to measure syscalls directly but I'd say they are intensive. > Linux wins this benchmark by a lot mainly because too much weight is given > to the file copy benchmarks In this particular instance I don't care about file system performance (and I believe that unixbench's benchmarks are outdated in this way and measure more of the file system cache than they should). Though it would be nice to have a FreeBSD file system that doesn't suck :) [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHesP4ldnAQVacBcgRAnpSAJ9yS1wBPTPCe8f05U4Ss/B5X1IQAACfZ/eF 8NX5KHwLhBIF2Y1SDdgqQPk= =6AM9 -----END PGP SIGNATURE-----help
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