Gathering the average values of Get-Counter outputs - powershell

Question

I am currently trying to gather the average performance values of processes over a long period of time. Unfortunately, my script is only able to average all the gathered values, rather than the averages of the individual processes.
The script below is what I ended up with, which unfortunately doesn't give an output for each respective process:
Write-Output (Get-Counter -Counter "\Processor(_Total)\% Processor Time","\Process(Chrome)\% Processor Time" -SampleInterval 1 -MaxSamples 25 |
Select-Object -ExpandProperty CounterSamples |
Select-Object -ExpandProperty CookedValue |
Measure-Object -Average).Average
Ideally, I'd like to have an object with the output values formatted like so:
Output.chrome = 5.1283123
Output.total = 23.128732

Answer 1

This works for me:
Get-Counter -Counter "\Processor(_Total)\% Processor Time","\Process(Chrome)\% Processor Time" -SampleInterval 1 -MaxSamples 25 `
| Select-Object -ExpandProperty CounterSamples `
| Group-Object -Property InstanceName `
| ForEach-Object {
$_ | Select-Object -Property Name, #{n='Average';e={($_.Group.CookedValue | Measure-Object -Average).Average}};
} `
| Format-Table -AutoSize;
Output:
Name Average
---- -------
_total 11.8878325281858
chrome 4.80058851283048
It'd be easy enough to conditionally rename the names.
EDIT: Try this for PowerShell v2.0:
Get-Counter -Counter "\Processor(_Total)\% Processor Time","\Process(Chrome)\% Processor Time" -SampleInterval 1 -MaxSamples 25 `
| Select-Object -ExpandProperty CounterSamples `
| Group-Object -Property InstanceName `
| ForEach-Object {
$_ | Select-Object -Property Name, #{n='Average';e={(($_.Group | Measure-Object -Property CookedValue -Average).Average)}};
} `
| Format-Table -AutoSize;

Answer 2

Here is an approach:
$chrome = #()
$total = #()
$counterName = "\Processor(_Total)\% Processor Time","\Process(Chrome)\% Processor Time"
Get-Counter -Counter $counterName -SampleInterval 1 -MaxSamples 10 |
Select-Object -ExpandProperty countersamples | % {
$object = New-Object psobject -Property #{
InstanceName = $_.InstanceName
CookedValue = $_.CookedValue
}
if($object.InstanceName -eq "Chrome") {
$chrome += $object
} else {
$total += $object
}
}
$output = [PSCustomObject]#{
Chrome = ($chrome | Measure-Object -Average CookedValue).Average
Total = ($total| Measure-Object -Average CookedValue).Average
}
$output
Output:
Chrome Total
------ -----
5,61702990401208 31,4667298163454