From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bengt Richter Subject: Re: 02/02: image: Disable compression for ISO images. Date: Tue, 28 Apr 2020 11:37:37 +0200 Message-ID: <20200428093737.GA8201@LionPure> References: <20200427140924.28752.28126@vcs0.savannah.gnu.org> <20200427140926.3B6CF20B7A@vcs0.savannah.gnu.org> <87blndt116.fsf@nckx> <87d07sx6ka.fsf@gmail.com> Reply-To: Bengt Richter Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: Received: from eggs.gnu.org ([2001:470:142:3::10]:36370) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jTMkk-0004te-HZ for guix-devel@gnu.org; Tue, 28 Apr 2020 05:44:08 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.90_1) (envelope-from ) id 1jTMgg-0004DQ-Lm for guix-devel@gnu.org; Tue, 28 Apr 2020 05:42:08 -0400 Received: from imta-35.everyone.net ([216.200.145.35]:39180 helo=imta-38.everyone.net) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jTMgg-00043w-3D for guix-devel@gnu.org; Tue, 28 Apr 2020 05:37:58 -0400 Content-Disposition: inline In-Reply-To: <87d07sx6ka.fsf@gmail.com> List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane-mx.org@gnu.org Sender: "Guix-devel" To: Mathieu Othacehe Cc: Guix-devel On +2020-04-27 18:00:05 +0200, Mathieu Othacehe wrote: > > Hey Tobias, > > > guix-commits@gnu.org 写道： > >> + ;; XXX: Temporarily disable compression to speed-up the tests. > >> + (compression? #f))) > > > > Interesting! What kind of improvement do you see, roughly? > > I posted some figures here: > https://lists.gnu.org/archive/html/guix-devel/2020-04/msg00374.html. > > Here's a more complete summary: > > --8<---------------cut here---------------start------------->8--- > | | Host (wip-disk-image) | VM (master) | > |----------------+-----------------------+-------------| > | No compression | 4min | 12min | > | Compression | 8min | 19min | > --8<---------------cut here---------------end--------------->8--- > > > When I added zlib compression I was surprised to learn that here it made no > > significant difference in wall clock time (less than a minute; 5% or so) or > > CPU time. The disks they spin and CPU she is fast, but still I would have > > noticed a spike. > > Strange we have different results, those benches are not very accurate > though. Might it throw some light to see your different results for --8<---------------cut here---------------start------------->8--- $ lscpu|grep -i bogo $ top -n1|grep ^MiB --8<---------------cut here---------------end--------------->8--- At least I'm curious :) > > Thanks, > > Mathieu > -- Regards, Bengt Richter