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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear yuanle,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">Thank you for the information. You might be right.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">But I am still confused about what¡¯s the difference between a vCPU and a physical core.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">Cheng<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> sylecn [mailto:sylecn@gmail.com]
<br>
<b>Sent:</b> 2014</span><span style="font-size:10.0pt;font-family:SimSun">Äê</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">3</span><span style="font-size:10.0pt;font-family:SimSun">ÔÂ</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">17</span><span style="font-size:10.0pt;font-family:SimSun">ÈÕ</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
15:06<br>
<b>To:</b> WANG Cheng D<br>
<b>Cc:</b> libvirt-users@redhat.com<br>
<b>Subject:</b> Re: [libvirt-users] a question on vCPU setting for lxc<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">Hi,<br>
<br>
I'm not libvirt expect. My guess is that some vcpu settings only apply to KVM/qemu backend. LXC is quite different from them.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">If setting vcpu# is not effective for LXC container, you may need to use cgroups.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><br clear="all">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><br>
--<br>
Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Yuanle<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">On Mon, Mar 17, 2014 at 2:32 PM, WANG Cheng D <<a href="mailto:Cheng.d.Wang@alcatel-sbell.com.cn" target="_blank">Cheng.d.Wang@alcatel-sbell.com.cn</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">I am not clear about the ¡®vcpu¡¯ element for CPU allocation. I allocated 1 vCPU to my container, after I started the container, I ran 4 computation-intensive tasks
on the container. And I found all the 4 physical core are 100% used (my host has 4 physical cores and no other application ran on the host except the container). That is, all available cores were used by the container. I want to know how to give a hard limitation
for CPU usage of a container.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">So I don¡¯t understand what ¡®vcpu¡¯ setting can be used for.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">I know that another CPU allocation element ¡®shares¡¯ can also be used, but this elements only give a relative quota. If new containers are started, the CPU quota
for the already started containers will change.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Cheng<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><br>
_______________________________________________<br>
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<a href="https://www.redhat.com/mailman/listinfo/libvirt-users" target="_blank">https://www.redhat.com/mailman/listinfo/libvirt-users</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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