VMWare, esxtop worlds

From the Host, I get the following:

 7:36:58pm up 3 days 41 min, 328 worlds, 1 VMs, 16 vCPUs; CPU load average: 0.02, 0.02, 0.02

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What is the concept of 328 worlds
Los Angeles1Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Esxtop uses worlds and groups as the entities to show CPU usage. A world is an ESX Server VMkernel schedulable entity, similar to a process or thread in other operating systems. A group contains multiple worlds.

A VM as an example. A powered-on VM has a corresponding group, which contains multiple worlds. In ESXi 5.0, there is one vcpu (hypervisor) world corresponding to each VCPU of the VM. The guest activities are represented mostly by the vcpu worlds. Besides the vcpu worlds, there are other assisting worlds, such as a MKS world and a VMX world. The MKS world assists mouse/keyboard/screen virtualization. The VMX world assists the vcpu worlds (the hypervisor).

To use esxtop, you need to read the manuals

http://www.vmware.com/pdf/vi3_301_201_resource_mgmt.pdf

or download and use

Source
http://www.veeam.com/esxi-monitoring-free.html.
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