From: Stefan Hajnoczi <stefanha@gmail.com>
To: 解壁伟 <xiebiwei@ict.ac.cn>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] About the Thread model in Qemu【 Is it one thread per vcpu?】
Date: Wed, 13 Mar 2013 09:45:40 +0100 [thread overview]
Message-ID: <20130313084540.GB14391@stefanha-thinkpad.muc.redhat.com> (raw)
In-Reply-To: <513EF6A0.4000601@ict.ac.cn>
On Tue, Mar 12, 2013 at 05:34:24PM +0800, 解壁伟 wrote:
> Hi there:
>
> I've read this an article discribe the thread model in Qemu.
> http://blog.vmsplice.net/2011/03/qemu-internals-overall-architecture-and.html
> Is there really one thread per vcpu in qemu?
>
> When I run the qemu using "-smp 16", I can see only two threads using
> "ps -xH".
"Note that TCG is not thread-safe so even under the iothread model it
multiplexes vcpus across a single QEMU thread. Only KVM can take
advantage of per-vcpu threads."
If you do not have -enable-kvm then you're probably using TCG.
Stefan
next prev parent reply other threads:[~2013-03-13 8:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-12 9:34 [Qemu-devel] About the Thread model in Qemu【 Is it one thread per vcpu?】 解壁伟
2013-03-12 22:26 ` Laszlo Ersek
2013-03-13 8:59 ` 解壁伟
2013-03-13 8:45 ` Stefan Hajnoczi [this message]
2013-03-13 9:32 ` 解壁伟
2013-03-13 9:51 ` Peter Maydell
2013-03-13 9:56 ` Laurent Desnogues
2013-03-13 12:21 ` Paolo Bonzini
2013-04-15 14:43 ` [Qemu-devel] Round robin of multi-vcpu in qemu 解壁伟
2013-04-23 1:25 ` 陳韋任 (Wei-Ren Chen)
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