Addition of SMP processors is not always advantageous

Hello

I was going to the best practices for vmware virtual SMP technology.

However, I stumbled on the fact that the addition of processors to the smp system still does not flow. I have read the reasons explained why this is so.

But I could not well what it is all new to me,

Please could someone explain to me in simple why words isn't always advantageous to continue to add more CPU to an SMP system.

Thank you.

I try to keep things simple, while planning for the CPU isn't really simple

All processors/cores are shared between the host itself and all virtual machines and all of them need sufficient CPU cycles to work with the performance you expect. If you assign multiple vCPUs to a virtual machine, the UC Planner must ensure that the number of virtual processors is available at the same time to execute commands. For example, assuming that you assign 4 vCPUs, the Planner must wait until the 4 cores are available. To achieve this, you need to pause the first carrots until the 4th is available. Meanwhile suspended hearts are not available for other processes.

In addition, vCPUs more generally does not add much performance to a virtual machine unless the applications running on the virtual machine are optimized to use multiple processors.

For more information, see http://www.vmware.com/resources/techresources/10131

André

Tags: VMware

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