To spot CPU overcommitment in the guest OS, ready time and usage percentage are two CPU resource parameters that you should monitor closely:

1. Log in to vCenter Server using vSphere Web Client.
2. On the home screen, navigate to Hosts and Clusters.
3. Expand the ESXi host and go to the CPU-hungry VM.
4. Navigate to the Monitor tab.
5. Navigate to the Performance tab.
6. Navigate to the Advanced view.
7. Click on Chart Options.

8. Navigate to CPU from Chart metrics.
9. Navigate to the VM object.
10. Navigate to the Advanced tab and click on Chart Options.
11. Select only Usage, Ready, and Used in the Counters section and click on OK:

The preceding example shows the high usage and used value on a VM configured with one vCPU. We can see its overall CPU usage is 100 percent:

The preceding example shows that after you added a second vCPU to the VM, the percentage of overall CPU usage dropped down to 52 percent.