Open Stack

On 09/09/2014 11:08 AM, Narayanan, Krishnaprasad wrote:
>
> Hi Chris,
>
>  
>
> They appear to be processes when I see it in htop. I have attached the
> screenshot of a VM named "instance-000001bf" that has 4 virtual cores.
> In total, I can see 6 processes for the above referred VM.
>
>  
>
>  
>
> Can I know is there a way to differentiate between  processes and threads?
>
>  
>

They ought to be processes according to the htop man page.  But I
suspect those are actually the thread IDs - one thread per each vcpu and
another thread executing the main loop dispatching events. The last one
seems to be a temporal work thread kicked off by the main loop.
The four threads spent similar amount of time running guest code - the
guest work load is spread evenly across all vcpus.

You may also run 'ps -AL | grep qemu' to have a look at the thead Ids
and the associated process ID (thread group ID).


Liang

> Best regards,
>
> Krishnaprasad
>
>  
>
> -----Original Message-----
> From: Chris Friesen [mailto:chris.friesen at windriver.com]
> Sent: Dienstag, 9. September 2014 16:31
> To: openstack at lists.openstack.org
> Subject: Re: [Openstack] KVM shows several processes for a single VM
> on the host
>
>  
>
> On 09/09/2014 07:58 AM, Narayanan, Krishnaprasad wrote:
>
> > Hallo all,
>
> > 
>
> > I have an OpenStack setup based on Havana with several compute nodes.
>
> > When I instantiate a virtual machine with 1 or more virtual cores, in
>
> > the process list of the compute node, I am able to see more than 1
>
> > process associated to the same VM. The process list that I refer is
>
> > the process which can be seen by running either top or htop.
>
> > 
>
> > Can I know the significance of other processes which are associated to
>
> > the same VM? Are these child processes?
>
>  
>
> Are they separate processes or separate threads?  Separate threads
> would be expected, but separate processes would not be.
>
>  
>
> Chris
>
>  
>
>  
>
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