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<p class="MsoNormal"><span style="color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">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?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Krishnaprasad<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="color:windowtext;mso-fareast-language:DE">From:</span></b><span lang="EN-US" style="color:windowtext;mso-fareast-language:DE"> lchen [mailto:cl55hhdu@gmail.com]
<br>
<b>Sent:</b> Dienstag, 9. September 2014 20:16<br>
<b>To:</b> openstack@lists.openstack.org<br>
<b>Subject:</b> Re: [Openstack] KVM shows several processes for a single VM on the host<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;mso-fareast-language:DE"><o:p> </o:p></span></p>
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<p class="MsoNormal">On 09/09/2014 11:08 AM, Narayanan, Krishnaprasad wrote:<o:p></o:p></p>
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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.</span><o:p></o:p></p>
<p class="MsoPlainText"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoPlainText"><span style="mso-fareast-language:DE"><img width="1732" height="142" id="Picture_x0020_1" src="cid:image001.png@01CFCC80.47374B40"></span><o:p></o:p></p>
<p class="MsoPlainText"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoPlainText"><span lang="EN-US">Can I know is there a way to differentiate between processes and threads?</span><o:p></o:p></p>
<p class="MsoPlainText"><span lang="EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DE"><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>
<br>
<br>
<o:p></o:p></span></p>
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<p class="MsoPlainText"><span lang="EN-US">Best regards,</span><o:p></o:p></p>
<p class="MsoPlainText"><span lang="EN-US">Krishnaprasad</span><o:p></o:p></p>
<p class="MsoPlainText"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoPlainText"><span lang="EN-US" style="mso-fareast-language:DE">-----Original Message-----<br>
From: Chris Friesen [<a href="mailto:chris.friesen@windriver.com">mailto:chris.friesen@windriver.com</a>]
<br>
Sent: Dienstag, 9. September 2014 16:31<br>
To: <a 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><o:p></o:p></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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