From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=55430 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PsHB6-0004rw-2F for qemu-devel@nongnu.org; Wed, 23 Feb 2011 11:03:01 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PsHB5-00085Y-0d for qemu-devel@nongnu.org; Wed, 23 Feb 2011 11:03:00 -0500 Received: from mx1.redhat.com ([209.132.183.28]:17675) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PsHB4-00085N-N8 for qemu-devel@nongnu.org; Wed, 23 Feb 2011 11:02:58 -0500 Message-ID: <4D652F35.7080303@redhat.com> Date: Wed, 23 Feb 2011 18:00:53 +0200 From: Avi Kivity MIME-Version: 1.0 Subject: Re: [Qemu-devel] Re: Strategic decision: COW format References: <4D5BC467.4070804@redhat.com> <4D5E4271.80501@redhat.com> <4D5E8031.5020402@codemonkey.ws> <4D637A20.9020307@redhat.com> <4D650F10.3060900@redhat.com> <4D651858.9040106@codemonkey.ws> <4D652675.1070908@redhat.com> <4D652868.8030908@codemonkey.ws> <4D6529A9.3090509@redhat.com> <4D652D22.9080605@codemonkey.ws> In-Reply-To: <4D652D22.9080605@codemonkey.ws> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Anthony Liguori Cc: Kevin Wolf , Chunqiang Tang , qemu-devel@nongnu.org, Stefan Hajnoczi , Markus Armbruster On 02/23/2011 05:52 PM, Anthony Liguori wrote: >> I still don't see. What would you do with thousands of checkpoints? > > > Er, hit send to quickly. > > HPC is a big space where checkpointing is actually useful. An HPC > workload may take weeks to run to completion. If something fails > during the run, it's a huge waste of time. However, if you do > regularl checkpointing, a failure may only lose a few minutes of work > instead of the entire weeks worth of work. The trick is to delete snapshot N-M after taking snapshot N (for a small constant M). -- error compiling committee.c: too many arguments to function