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That will be the process ID.


Regards,
Liang

On 09/09/2014 04:56 PM, Narayanan, Krishnaprasad wrote:
>
> Hi,
>
>  
>
> I used the command ps --AL | grep qemu and I was able to see the
> process ID 6850 having 6 thread IDs. In case, if I am interested to
> measure the hardware performance counters / event provided by the CPU
> registers such as CPU_CLK_UNHALTED, BRANCH_MISSES and etc..., can I
> know which process ID should I be using to get this information?
>
>  
>
> Regards,
>
> Krishnaprasad
>
>  
>
> *From:*lchen [mailto:cl55hhdu at gmail.com]
> *Sent:* Dienstag, 9. September 2014 20:16
> *To:* openstack at lists.openstack.org
> *Subject:* Re: [Openstack] KVM shows several processes for a single VM
> on the host
>
>  
>
>  
>
> 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
>     <mailto: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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