How is CPU Utilization calculated for AIX server?
CPU Utilization
We use the following methods of calculation for CPU Utilization when
lparstat command is supported:
Method 1: If
'type=Dedicated
',
then we use the
vmstat
command output. (i.e)
cpu
=100-Idle Time
Method 2: If
'type=Shared' , '
mode=UnCapped', and
'smt=On' , then
cpu
=lcpu/2
Method 3: If
'type=Shared' , '
mode=UnCapped', and
'smt' is disabled or not available , then
cpu
=lcpu
Method 4: If
'type=Shared' , '
mode=UnCapped', and
'smt=x' , then
cpu
=lcpu/x
Method 5: If
'type=Shared' , and '
mode=Capped', then
cpu
=ent
CPU Utilization can be calculated by replacing
cpu (calculated from the above methods) in the below calculation:
CPU Utilization %=(physc*100)/cpu
CPU Core Utilization
If you have multiple cores, we show individual CPU cores usage calculation we use the below command and this is shown in a different tab (there is a separate CPU tab where this individual cores usage is shown).
Command:
sar -u -P ALL 1 3
Note: These calculations are based on the feedback from our customers who are AIX admins/users.
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