Date: Sun, 24 Feb 2008 22:00:22 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: cpu usage in 7.0 Message-ID: <fpslt8$fjj$1@ger.gmane.org> In-Reply-To: <47BFB70F.5080402@FreeBSD.org> References: <845250.18624.qm@web63909.mail.re1.yahoo.com> <47BF5702.3020204@FreeBSD.org> <47BF8EB7.9090007@barafranca.com> <47BFB70F.5080402@FreeBSD.org>
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[-- Attachment #1 --] Kris Kennaway wrote: > Hugo Silva wrote: >> Kris Kennaway wrote: >>> Barney Cordoba wrote: >>>> I have a dual core system running 7.0 and I can't get >>>> top to show more than 100% usage no matter how I >>>> hammer it. My MAC shows over 100% often, but its not >>>> clear if top is averaging the 2 cpus or just not going >>>> over 100, or just showing 1 of the cpus. >>> >>> 100% in FreeBSD means "all of your CPUs are completely active". It >>> is hard to exceed this amount :-) >> >> You should see my production mysql going over 458% on service startup, >> on a quad core server :-) > > That is a multithreaded process using multiple CPUs, not the total CPU > statistics (first line of top(1)). So how does a multithreaded process get 458% CPU on a quad-core machine? :) (Really, I want to know; I thought thread CPU accounting was fixed in 7.x. Unless I'm mistaken, 4 CPU-intensive threads in a single process should account as 4 CPU-intensive single-thread processes; i.e. each could only take up to 100% of a core/CPU, accounting for NCPU*100% total). [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHwdrmldnAQVacBcgRAkc7AKCfpM90c6jEnMgNqdDxAOGwkiThIgCfXiXv V5YimNwvkPTleMkxAfTTwLM= =vAhL -----END PGP SIGNATURE-----help
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