Date: Mon, 24 Jan 2011 20:07:25 -0700 From: Chad Perrin <perrin@apotheon.com> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: more CPU being used than I have (?) Message-ID: <20110125030725.GA62670@guilt.hydra> In-Reply-To: <1295917366.59721.2.camel@main> References: <20110124235740.GA62134@guilt.hydra> <1295917366.59721.2.camel@main>
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[-- Attachment #1 --] On Tue, Jan 25, 2011 at 01:02:46AM +0000, Craig Butler wrote: > On Mon, 2011-01-24 at 16:57 -0700, Chad Perrin wrote: > > I'm running a two-core laptop that, once in a great while, shows > > approximately 250% CPU usage by a single process in top. How exactly > > does that work? > > > > Note: It's not entirely surprising that this particular process is > > consuming a lot of resources. It's just surprising to me that it's > > consuming more than CPUs * 100%. > > Hi Chad > > Its to do with top using weighted CPU percentage... for some reason this > show peaks as more usage than 100% -- maybe something to do with the top > averaging out over a specific time. > I find that raw CPU mode gives a more accurate representation. > > raw mode is toggled by passing the -C argument to top. Do you have a reference to a relatively simple explanation of how that weighting works (and why)? -- Chad Perrin [ original content licensed OWL: http://owl.apotheon.org ] [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAk0+Pm0ACgkQ9mn/Pj01uKVCdgCgv9cvXg/TTYLhL7cmQfa3thnO bWIAoL1FfqVgBT3X4AeBmjdcc3TPUyBv =mPjG -----END PGP SIGNATURE-----
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