Date: Tue, 16 Oct 2001 12:42:10 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Mike Pumford <mpumford@mpc-data.co.uk> Cc: freebsd-questions@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG Subject: Re: 0.00% CPU for all processes Message-ID: <20011016124209.A33631@dan.emsphone.com> In-Reply-To: <200110161236.NAA17246@lion.mpc-data.co.uk> References: <200110160601.f9G611T20245@zibbi.icomtek.csir.co.za> <200110161236.NAA17246@lion.mpc-data.co.uk>
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In the last episode (Oct 16), Mike Pumford said: > > > One thing which surprises me, though --- all other processes are > > > zero. Is this normal? This is my first time seeing FreeBSD run. > > > I have an identical box here running linux (and each box runs a > > > minimum of services), where at least top will show nonzero CPU > > > percentage in top, usually around 0.5%. Does linux have more > > > fine-grained timing, or is it cheating, or does the margin of > > > error render this test essentially meaningless anyway? > > top on Linux is really slow compared to the BSD versions. It is > slower to update and always consumes a significant chunk of CPU. BSD > top seems much more efficient. Possibly down to the fact the BSD top > gathers its info with libkvm while linux top has to parse a load of > files in /proc. I suspect there may be differences in the CPU usage > calculation algorithm as well. The first thing I do on every Linux box installed here at work is to compile top-3.5beta12. Works great. Whatever ships with Linux doesn't deserve to be called 'top'. -- Dan Nelson dnelson@allantgroup.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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