Tech: How vSMP works in VMware ESX and when to use it

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日本語

Tech: How vSMP works in VMware ESX and when to use it

Posted by Alessandro Perilli | Tuesday, July 08, 2008 |

Few days ago VMware published a precious FAQ about its virtual SMP technology which answers some key questions about the use of multiple CPUs inside ESX virtual machines:

When do I decide to configure multiple vCPUs for a VM?
What are the overheads of using multiprocessor VMs? What would I lose by over provisioning vCPUs for VMs?
Does the ESX scheduler (co-schedule) all of the vCPUs belonging to a VM together?
Why is co-scheduling necessary and important?
How does ESX scheduler deal with certain vCPUs belonging to a VM idling while others actively perform work? Do the idle vCPUs unnecessarily burn CPU?

About this topic VMware also published a technical article which describes in details the resource management approach, called co-scheduling, used for vSMP in ESX Server 2.x and ESX 3.x.

Highly recommended.

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