问题

VM / VCPU和用法

  • 2021年12月24日
  • 1回复
  • 113意见
l

你好呀，

我需要解释有关VCPU用法的解释：

  • 我的CPU型号是Intel（R）Xeon（R）Silver 4208 CPU @ 2.10GHz（8核，16线）
  • 我每个主机有两个插座
  • 因此2 x 8 = 16个内核和4200 MHz（基本FREQ） / 6400 MHz（MAX TURBO FREQ）
  • 因此32 VCPU（16个核心x 2 = 32螺纹带超线程）
  • VM使用6个VCPU和1个核心
  • 该VM的Prism报告，占CPU使用率的97％

97％的东西？那是6400 /32 x 6 = 1200 MHz吗？一半的物理CPU？

如何进行计算？

谢谢，

杰罗姆

Hi there,<\/p>

I need explaination about vCPU usage :<\/p>

  • My CPU Model is\u00a0Intel(R) Xeon(R) Silver 4208 CPU @ 2.10GHz (8 core, 16 thread)\u00a0<\/li>\t
  • I have two socket per host<\/li>\t
  • So 2 x 8 = 16 cores and 4200 Mhz (base freq)\u00a0\/ 6400 Mhz (max turbo freq)<\/li>\t
  • So 32 vCPU (16 cores x 2 = 32 thread with Hyperthreading)<\/li>\t
  • A VM use 6\u00a0vCPU and 1 core<\/li>\t
  • Prism report for this VM, 97% of CPU usage<\/li><\/ul>

    97% of what ? Is that 6400 \/ 32 x 6 = 1200\u00a0Mhz ?? The half a physical CPU ?<\/p>

    How that calculation is made ?<\/p>

    Thanks,<\/p>

    Jerome<\/p>","quoteUsername":"llopht","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

1回复

戴维
UserLevel 2
徽章 +5

Ehello，

很棒的问题……得到了我有兴趣查找一些事情。

虽然知道您正在运行哪种管理程序和AOS版本会很有帮助，但我将包括我为AHV和ESXI找到的内容。（我假设AHV因为您没有提及Hyper-V和vCenter）。

最终，我认为这个KB应该回答您的问题（但不是直接来自棱镜）。我很想知道您的场景中有哪些价值棱镜显示。

https://portal.nutanix.com/page/documents/kbs/details?targetId=ka00e000000000000000000cvlncac

简而言之，请使用以下AHV命令查找CPU频率值：

CPUPOWER频率INFO
Sudo Turbostat

投入“ LSCPU |更加良好的措施，您应该有足够的信息来了解VM正在使用的内容。有趣的是，在AHV上，您还需要检查BIOS（见KB）是否是否确实启用了CPU设置。

对于VMware，有关类似的描述/CPU信息，请参见KB 80610。

编辑：

想提及相关的Nutanix KB文章，该文章在电源出现的情况下提出了一个有趣的转折。

https://portal.nutanix.com/page/documents/kbs/details?targetId=ka07v00000000ly5usag

\u00a0<\/p>

EHello,<\/p>

Great question\u2026\u00a0got me <\/em>interested in looking up a few things.
\u00a0<\/p>

While it would have been helpful to know which hypervisor and AOS version you\u2019re running, I\u2019ll include what I found for AHV and ESXi. (I assume AHV since you didn\u2019t mention Hyper-V nor vCenter).<\/p>

\u00a0<\/p>

Ultimately I think this KB should answer your question (but not directly from Prism). I\u2019d be curious to see which value Prism shows in your scenario.<\/p>

https:\/\/portal.nutanix.com\/page\/documents\/kbs\/details?targetId=kA00e000000CvlnCAC<\/a><\/p>

\u00a0<\/p>

In short summary use the following AHV commands to find out the CPU frequency values:<\/p>

cpupower frequency-info<\/pre>
sudo turbostat<\/pre>
Throw in an \u201clscpu | more\u201d for good measure and you should have sufficient info to find out what the VM is using.\u00a0Interestingly enough, on AHV you\u2019d also would need to check if the BIOS (see KB) to confirm if CPU settings were indeed set enabled.<\/p>
\u00a0<\/p>
For VMWare see\u00a0KB 80610 for a similar description\/cpu info.<\/p>
\u00a0<\/p>
EDIT:<\/p>
Wanted to mention a related Nutanix KB article which presents an interesting twist in situations where a power supply is out.\u00a0<\/p>
https:\/\/portal.nutanix.com\/page\/documents\/kbs\/details?targetId=kA07V000000LY5uSAG<\/a><\/p>","quoteUsername":"DavidN","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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