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:cl55h...@gmail.com] Sent: Dienstag, 9. September 2014 20:16 To: openstack@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. [cid:image001.png@01CFCC80.47374B40] 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.frie...@windriver.com] Sent: Dienstag, 9. September 2014 16:31 To: openstack@lists.openstack.org<mailto:openstack@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 _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org<mailto:openstack@lists.openstack.org> Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org<mailto:openstack@lists.openstack.org> Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
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