The Late Great Virtual CPU Debate

June 9, 2011 No Comments

Blog post by Ken Hess

Do you ever have the situation where you have a sluggish virtual machine (VM) and in trying to find the bottleneck, you raise the number of vCPUs? Did it work? If your VM experiences a slowdown, then the problem is the extra vCPU(s). It’s counterintuitive to see this occur but it’s a real phenomenon. To clarify, you might experience a performance hit by adding vCPUs to a VM. Crazy, yes, but there are some good reasons for it.

You also want to be careful of using multiple vCPUs and then moving back to a single vCPU. Some operating systems don’t do well with that change. Windows Server 2003 being one of them.

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