CPU Allocation_cpusetcpus 1-4-优快云博客

本文链接：https://blog.youkuaiyun.com/wllabs/article/details/78113112

本文详细介绍了如何通过<cpu>元素定义虚拟机的最大虚拟CPU数量及其默认绑定的物理CPU列表。此外还讨论了<vcpu>元素中cpuset属性的作用，以及vcpupin和emulatorpin属性如何影响虚拟CPU的绑定策略。

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<domain>
  ...
  <vcpu placement='static' cpuset="1-4,^3,6" current="1">2</vcpu>
  ...
</domain>

Figure 20.6. CPU allocation

The <cpu> element defines the maximum number of virtual CPUs (vCPUs) allocated for the guest virtual machine operating system, which must be between 1 and the maximum supported by the hypervisor. This element can contain an optional cpuset attribute, which is a comma-separated list of physical CPU numbers that domain processes and virtual CPUs can be pinned to by default.

Note that the pinning policy of domain processes and virtual CPUs can be specified separately by using the cputune attribute. If the


emulatorpin

attribute is specified in <cputune>, the cpuset value specified by


<vcpu>

will be ignored.

Similarly, virtual CPUs that have set a value for


vcpupin

cause cpuset settings to be ignored. Virtual CPUs where vcpupin is not specified will be pinned to the physical CPUs specified by cpuset. Each element in the


cpuset

list is either a single CPU number, a range of CPU numbers, or a caret (^) followed by a CPU number to be excluded from a previous range. The attribute current can be used to specify whether fewer than the maximum number of virtual CPUs should be enabled.

The optional attribute placement can be used to specify the CPU placement mode for the domain process. placement can be set as either


static

or auto. If you set <vcpu placement='auto'>, the system will query numad and use the settings specified in the <numatune> tag, and ignore any other settings in <vcpu> . If you set