Word of the Day: #virtualCPU A virtual CPU (#vCPU), also known as a virtual processor, is a physical central processing unit (#pCPU) that is assigned to a virtual machine (#VM). By default, virtual machines are allocated one vCPU each. If the physical host has multiple CPU cores at its disposal, however, then a CPU scheduler assigns execution contexts and the vCPU essentially becomes a series of time slots on a logical processor. Because processing time is billable, it is important for an administrator to understand how his provider documents vCPU usage in an invoice. It is also important for the administrator to realize that adding more vCPUs will not automatically improve performance. This is because as the number of vCPUs goes up, it becomes more difficult for the scheduler to coordinate time slots on the physical CPUs, and the wait time can degrade performance.
Posted on: Mon, 28 Apr 2014 19:30:57 +0000
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