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Re: [Qemu-devel] qemu becomes unresponsive sometimes

From: Paul Jakma
Subject: Re: [Qemu-devel] qemu becomes unresponsive sometimes
Date: Sun, 28 Nov 2004 04:59:14 +0000 (GMT)

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?

Paul Jakma      address@hidden  address@hidden  Key ID: 64A2FF6A
Argue for your limitations, and sure enough, they're yours.
                -- Messiah's Handbook : Reminders for the Advanced Soul

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