Top 5 Processes with CPU % and Process ID using Powershell - powershell

Question

I tried this script
Get-Counter -ErrorAction SilentlyContinue '\Process(*)\% Processor Time' |
Select -ExpandProperty countersamples |
?{$_.instanceName -notmatch "^(idle|_total|system)$"} |
Sort -Descending cookedvalue |
Select -First 5 #{
L='ProcessName';
E={[regex]::matches($_.Path,'.*process\((.*)\)\\% processor.*').groups[1].value}
},
#{
L='CPU';
E={($_.Cookedvalue/100/$env:NUMBER_OF_PROCESSORS).toString('P')}
},
#{
L='ProcessId';
E={((Get-Counter "\Process([regex]::matches($_.Path,'.*process\((.*)\)\\% processor.*').groups[1].value)\ID Process" -ErrorAction SilentlyContinue).CounterSamples).Cookedvalue}
}
I am able to get ProcessName and CPU % columns but not ProcessID
ProcessName CPU ProcessId
----------- --- ---------
firefox#4 0.58%
svchost#11 0.19%
firefox#6 0.19%
dwm 0.10%
svchost#39 0.10%

Answer 1

Make sure you request both the % Processor Time and ID Process counter from each counter instance, then use Group-Object to group them together.
Worth noting is that you don't need regex to correlate the two, simply group on the first part of the counter path (\Process(notepad#3)). Regex is also not needed for extracting the process name, since each sample already has an InstanceName property with the corresponding process name.
Once you've correlated name + process ID + sample value, you can start sorting, and then finally format the CPU percentage:
Get-Counter '\Process(*)\ID Process','\Process(*)\% Processor Time' -ErrorAction SilentlyContinue |
ForEach-Object {
$_.CounterSamples |
Where-Object InstanceName -NotMatch '^(?:idle|_total|system)$' |
Group-Object {Split-Path $_.Path} |
ForEach-Object {
[pscustomobject]#{
ProcessName = $_.Group[0].InstanceName
ProcessId = $_.Group |? Path -like '*\ID Process' |% RawValue
CPUCooked = $_.Group |? Path -like '*\% Processor Time' |% CookedValue
}
} |Sort-Object CPUCooked -Descending |
Select-Object -First 5 -Property *,#{Name='CPUPercentage';Expression={'{0:P}' -f ($_.CPUCooked / 100 / $env:NUMBER_OF_PROCESSORS)}} -ExcludeProperty CPUCooked
}