[TEST/REVIEW] CPU accounting patches

Mullen, Adam Adam.Mullen at c-b.com
Fri Jan 27 10:39:46 PST 2006

Lets see here though, how many of us have a 100 node beowulf cluster who
use FreeBSD daily?  I know I don't!  I've been following this
conversation and my 2 cents are this, taking into consideration cpu time
accounting for machines that use power management is trivial.  I view
those that use power management are a lot less likely to be in an
environment where they are either A) billing for utility computing, B)
care about 99.9999% accurate cpu time accounting, C) have a need for
this precision.  My thought is that a blurb be submitted with this patch
specifying the caveats if powersaved is also used.  Just my humble

-----Original Message-----
From: owner-freebsd-arch at freebsd.org
[mailto:owner-freebsd-arch at freebsd.org] On Behalf Of Garance A Drosihn
Sent: Friday, January 27, 2006 12:30 PM
To: Mike Jakubik
Cc: arch at freebsd.org; current at freebsd.org
Subject: Re: [TEST/REVIEW] CPU accounting patches

At 4:03 AM -0500 1/27/06, Mike Jakubik wrote:
>Let's not forget, FreeBSD is really a server OS. Who in their right 
>mind uses power saving features on a server? It sounds nice in theory, 
>but doesn't work as well.

Apparently your power and cooling bills are much lower than ours.

We would very much love it if the computers will use only the energy
they need to get the job done.  Yes, that means a big bill when some
simulation is running on a 100-node beowulf cluster.  But it also means
we don't want to be paying the bill to run that cluster at full-throttle
when there's no work for those CPU's to do.

Garance Alistair Drosehn            =   gad at gilead.netel.rpi.edu
Senior Systems Programmer           or  gad at freebsd.org
Rensselaer Polytechnic Institute    or  drosih at rpi.edu
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