From owner-freebsd-questions@freebsd.org Wed Aug 10 00:56:49 2016 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 01D67BB235B for ; Wed, 10 Aug 2016 00:56:49 +0000 (UTC) (envelope-from frank@woodcruft.co.uk) Received: from b.painless.aa.net.uk (b.painless.aa.net.uk [81.187.30.52]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id C15151D77 for ; Wed, 10 Aug 2016 00:56:48 +0000 (UTC) (envelope-from frank@woodcruft.co.uk) Received: from woodcruft.co.uk ([81.187.49.114] helo=lime.woodcruft.co.uk) by b.painless.aa.net.uk with esmtp (Exim 4.77) (envelope-from ) id 1bXGrT-0003KA-HN; Wed, 10 Aug 2016 00:55:07 +0100 Received: by lime.woodcruft.co.uk (Postfix, from userid 1001) id 0C3C255629; Wed, 10 Aug 2016 00:55:06 +0100 (BST) Date: Wed, 10 Aug 2016 00:55:06 +0100 From: Frank Shute To: RW Cc: freebsd-questions@freebsd.org Subject: Re: Power consumption tuning Message-ID: <20160809235506.GA97161@lime.woodcruft.co.uk> Reply-To: Frank Shute Mail-Followup-To: RW , freebsd-questions@freebsd.org References: <20160809172345.312117ac@e733> <20160809165640.5aa087c2@gumby.homeunix.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20160809165640.5aa087c2@gumby.homeunix.com> X-Face: *}~{PHnDTzvXPe'wl_-f%!@+r5; VLhb':*DsX%wEOPg\fDrXWQJf|2\,92"DdS%63t*BHDyQ|OWo@Gfjcd72eaN!4%NE{0]p)ihQ1MyFNtWL X-Operating-System: FreeBSD 10.3-RELEASE-p4 amd64 X-Organisation: 'woodcruft.co.uk' User-Agent: Mutt/1.6.1 (2016-04-27) Content-Transfer-Encoding: quoted-printable X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Aug 2016 00:56:49 -0000 On Tue, Aug 09, 2016 at 04:56:40PM +0100, RW via freebsd-questions wrote: > > On Tue, 09 Aug 2016 17:03:36 +0200 > Sol=C3=A8ne Rapenne wrote: >=20 >=20 > > Buying a device to measure the power consumption is also a good idea, > > so you can check your changes. > > It costs around 12=E2=82=AC. Example > > http://www.ecvv.com/product/1000019919.html >=20 > A lot of those cheap power meters will work with simple loads like > heaters or fridges, but are very inaccurate with computers. I have one > and I've heard a lot of bad reports about them. =20 If you've got a UPS (and you should have IMO) then you can get the power usage. Eg: $ apcaccess -p LOADPCT 33.0 Percent and: $ apcaccess -p NOMPOWER 210 Watts So I'm using ~70W ATM. Trivial to script a report maybe with the help of cron. I'd guess the accuracy is good enough for most purposes. I'm sure APC pub= lish such info on their website. Regards, --=20 Frank https://woodcruft.co.uk/