Host CPU usage above actual capacity?

[jblik]

Can someone help me wrap my mind around something? I've got a host who's current CPU usage in MHz is above it's total capacity. How is this possible??? It's a 16 core (32 logical) system with 2 VMs, both with 8 vCPUs BTW.

[JimKnopf99]

Hi,

from the Monitoring and Performance Guide

PCPU USED(%) A PCPU refers to a physical hardware execution context. This can be a physical CPU core if

hyperthreading is unavailable or disabled, or a logical CPU (LCPU or SMT thread) if

hyperthreading is enabled.

PCPU USED(%) displays the following percentages:

n percentage of CPU usage per PCPU

n percentage of CPU usage averaged over all PCPUs

CPU Usage (%USED) is the percentage of PCPU nominal frequency that was used since the last

screen update. It equals the total sum of %USED for Worlds that ran on this PCPU.

NOTE If a PCPU is running at frequency that is higher than its nominal (rated) frequency, then

PCPU USED(%) can be greater than 100%.

If a PCPU and its partner are busy when hyperthreading is enabled, each PCPU accounts for half

of the CPU usage.

That could be, if you enable Intel Turbo Boost or something like that.

Frank

[jblik]

Many thank Frank!