CPU number in ESX 3.5

[frantzcollini]

Hello,

i work on a physical machine Dell Dual-QuadCore 2,26 Ghz with ESX 3.5.

In the VM features, i can choose how many virtual processors can be assigned to a single VM: 1, 2 or 4.

How can i obtain the best performances? I noticed that not always i have the greatest performance setting 4 virtual processor...

Thank you in advance for your interest, see ya!

Francesco

[Troy_Clavell]

you will find that best practice starts with just adding a single vCPU, and if needed go up to 2vCPU's. Having 4vPCUs in a VM, in my opinion, isn't going to give you better results.

http://www.vmware.com/pdf/vi_performance_tuning.pdf

[depping]

remember that 1 vcpu run on 1 core. if you've got 4 cores and one 4 vcpu you've got all 4 cores occupied worse case. this means that any other operation needs to fight for his turn. When you've got multiple vm's running and 1 4vcpu core there will be a lot of fighting.

Duncan

VMware Communities User Moderator

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