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<div class="moz-cite-prefix">On 09/09/2014 11:08 AM, Narayanan,
Krishnaprasad wrote:<br>
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<p class="MsoPlainText">Hi Chris,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span lang="EN-US">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.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="mso-fareast-language:DE"><img
id="Picture_x0020_1"
src="cid:part1.06030209.05040700@gmail.com" height="142"
width="1732"></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Can I know is there a
way to differentiate between processes and threads?<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
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<br>
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.<br>
The four threads spent similar amount of time running guest code -
the guest work load is spread evenly across all vcpus.<br>
<br>
You may also run 'ps -AL | grep qemu' to have a look at the thead
Ids and the associated process ID (thread group ID).<br>
<br>
<br>
Liang<br>
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<p class="MsoPlainText"><span lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Krishnaprasad<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="mso-fareast-language:DE"
lang="EN-US">-----Original Message-----<br>
From: Chris Friesen [<a class="moz-txt-link-freetext" href="mailto:chris.friesen@windriver.com">mailto:chris.friesen@windriver.com</a>] <br>
Sent: Dienstag, 9. September 2014 16:31<br>
To: <a class="moz-txt-link-abbreviated" href="mailto:openstack@lists.openstack.org">openstack@lists.openstack.org</a><br>
Subject: Re: [Openstack] KVM shows several processes for a
single VM on the host</span></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">On 09/09/2014 07:58 AM, Narayanan,
Krishnaprasad wrote:<o:p></o:p></p>
<p class="MsoPlainText">> Hallo all,<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">> I have an OpenStack setup based on
Havana with several compute nodes.<o:p></o:p></p>
<p class="MsoPlainText">> When I instantiate a virtual
machine with 1 or more virtual cores, in
<o:p></o:p></p>
<p class="MsoPlainText">> the process list of the compute
node, I am able to see more than 1
<o:p></o:p></p>
<p class="MsoPlainText">> process associated to the same VM.
The process list that I refer is
<o:p></o:p></p>
<p class="MsoPlainText">> the process which can be seen by
running either top or htop.<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">> Can I know the significance of
other processes which are associated to
<o:p></o:p></p>
<p class="MsoPlainText">> the same VM? Are these child
processes?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Are they separate processes or separate
threads? Separate threads would be expected, but separate
processes would not be.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Chris<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">_______________________________________________<o:p></o:p></p>
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