vCPU guidelines — multiple vCPUs per virtual guest

1152895 pts.
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Microsoft virtualization
vCPU
VMware
What are the recommendations around assigning vCPU's to virtual guests. I've read a lot about vmware recommending to not use multiple vCPU's per virtual guest unless it`s really required. Are there any specific guidelines on how to allocate vCPU's? This question is from the Microsoft Virtualization Chat on ITKnowledgeExchange.com
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The general rule of them (this is from my consulting days also) is not to provide multiple CPUs to VMs unless the programs are multi-processor aware. There is no discernible benefit if not and sometimes, we’ve seen some performance degradation but that is related to the applications, not virtualization or any hypervisor.

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