From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.33) id 1CYHKh-00049S-MS for qemu-devel@nongnu.org; Sun, 28 Nov 2004 00:10:47 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.33) id 1CYHKf-00047Y-Mn for qemu-devel@nongnu.org; Sun, 28 Nov 2004 00:10:46 -0500 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.33) id 1CYHKf-00046N-An for qemu-devel@nongnu.org; Sun, 28 Nov 2004 00:10:45 -0500 Received: from [212.17.55.49] (helo=hibernia.jakma.org) by monty-python.gnu.org with esmtp (TLSv1:DES-CBC3-SHA:168) (Exim 4.34) id 1CYH9x-0001Tw-Ey for qemu-devel@nongnu.org; Sat, 27 Nov 2004 23:59:44 -0500 Received: from sheen.jakma.org (sheen.jakma.org [212.17.55.53]) by hibernia.jakma.org (8.12.11/8.12.11) with ESMTP id iAS4xEnY014921 for ; Sun, 28 Nov 2004 04:59:30 GMT Date: Sun, 28 Nov 2004 04:59:14 +0000 (GMT) From: Paul Jakma Subject: Re: [Qemu-devel] qemu becomes unresponsive sometimes In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Qemu On Thu, 11 Nov 2004, Paul Jakma wrote: > Qemu sometimes becomes unresponsive for periods of time. You cant grab the > screen, the monitor (with stdio) is unresponsive. > > Usually it will come back. However, sometimes not. Eg, I just tried "openssl > speed" on Solaris on Qemu, and it never came back - just using 99% CPU for > over an hour. In trying to debug this problem and try find vaguely wherein qemu the problem lies, I've observed that strace'ing the spinning qemu'ing will cause it to become responsive again. I've actually taken to running my more important qemu instances with a backgrounded strace attached, with strace output directed to /dev/null. Anyone know why qemu sometimes become unresponsive, and why does stracing qemu make it become responsive again? (for me, typically when stressing qemu, eg running 'openssl speed' or some big java application). Am I the only one who experiences this? regards, -- Paul Jakma paul@clubi.ie paul@jakma.org Key ID: 64A2FF6A Fortune: Argue for your limitations, and sure enough, they're yours. -- Messiah's Handbook : Reminders for the Advanced Soul