[Qemu-devel] SMP

[Qemu-devel] SMP

[Joe Batt]

I realize that this may be pushing the future a bit, I just wanted to
start the discussion.

What challenges do we (or does Fabrice) face
- creating an qemu SMP guest?
- multithreading qemu to utilize a SMP host?
- integrating with something like mosix so you could build a virtual 50
CPU box in a lab across 50 real machines (or a 250 CPU box on 50
machines to avoid waiting on IO)
- how would numa figure into this (I'm completely ignorant of what a
numa machine looks like)

I am very interested in single image clusters (as a spectator), but what
I've seen so far is coupling machines at a level that seems to high and
complex to me.  It seems silly that each machine has to have a full OS
installed and configured just right.  Building a big single image
machine on linked VMs would allow us to run qemu on a stripped down OS
(just drivers and basic services) or a heterogeneous network (even a mix
of linux kernels would beat mosix).

Thanks for any consideration.
Joe

Re: [Qemu-devel] SMP

[Joseph Stewart]

I say this half-joking and half-serious, but how about a qemu
emulation for the Transputer core?...
(http://www.embedded.com.au/reference/transputers.html and
http://www.classiccmp.org/transputer/).

Seriously, I don't know enough about the internal structure of QEMU to
know if this is even a reasonable or desirable feature. And then
there's the issue of learning OCCAM.

-joe

On Wed, 28 Jul 2004 15:10:50 -0500, Joe Batt <joe@soliddesign.net> wrote:
> I realize that this may be pushing the future a bit, I just wanted to
> start the discussion.
> 
> What challenges do we (or does Fabrice) face
> - creating an qemu SMP guest?
> - multithreading qemu to utilize a SMP host?
> - integrating with something like mosix so you could build a virtual 50
> CPU box in a lab across 50 real machines (or a 250 CPU box on 50
> machines to avoid waiting on IO)
> - how would numa figure into this (I'm completely ignorant of what a
> numa machine looks like)
> 
> I am very interested in single image clusters (as a spectator), but what
> I've seen so far is coupling machines at a level that seems to high and
> complex to me.  It seems silly that each machine has to have a full OS
> installed and configured just right.  Building a big single image
> machine on linked VMs would allow us to run qemu on a stripped down OS
> (just drivers and basic services) or a heterogeneous network (even a mix
> of linux kernels would beat mosix).
> 
> Thanks for any consideration.
> Joe
> 
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel
>

[Qemu-devel] SMP

[Jacek Poplawski]

Hello.

Does "-smp 2" option use both CPUs of my host, or only one?
I had impression that "smp" if just emulated, because my compilation 
inside target OS is two times longer...

Is there any way to use two host CPUs in Qemu?


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Re: [Qemu-devel] SMP

[Pascal Terjan]

On 4/6/06, Jacek Poplawski <jacekp@s3group.com.pl> wrote:
> Hello.
Hello

> Does "-smp 2" option use both CPUs of my host, or only one?
only one

> I had impression that "smp" if just emulated, because my compilation
> inside target OS is two times longer...
>
> Is there any way to use two host CPUs in Qemu?
No

Re: [Qemu-devel] SMP

[Rakotomandimby Mihamina]

On Thu, 2006-04-06 at 19:06 +0200, Pascal Terjan wrote:
> > Does "-smp 2" option use both CPUs of my host, or only one?
> only one
> > Is there any way to use two host CPUs in Qemu?
> No

Sorry, I am late for this discussion.
On multi-core/multi-proc architecture, how are dispatched the qemu
instances of I launch many?
Is it the problem of the operating system? What if it loads only one
core/processor?
Thank you.
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