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Date:      Tue, 25 Jan 2011 01:02:46 +0000
From:      Craig Butler <craig001@lerwick.hopto.org>
To:        Chad Perrin <perrin@apotheon.com>
Cc:        FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: more CPU being used than I have (?)
Message-ID:  <1295917366.59721.2.camel@main>
In-Reply-To: <20110124235740.GA62134@guilt.hydra>
References:  <20110124235740.GA62134@guilt.hydra>

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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.

Regards

Craig Butler 




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