check powershell process cpu usage

Hello,

I try to check cpu usage by prowershell process, the following query returns 0%, why ?

  $ProcessList = gwmi Win32_PerfFormattedData_PerfProc_Process -Filter "name like 'PowerShell%'"  | where {$_.Name -ne "_Total" -and $_.Name -ne "Idle"} | select IDProcess,Name,PercentProcessorTime | sort PercentProcessorTime -Descending
  $PS_CPU = ($ProcessList | Measure-Object -Property PercentProcessorTime -Sum).Sum 
  echo $PS_CPU

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Thanks
bibi92Asked:
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Phil DavidsonCommented:
By prowershell process?  Surely you mean PowerShell.

The PowerShell commands operate on processes named "PowerShell" or have "PowerShell" in their name.  Unless you have some job running with PowerShell, it may using nothing more than a negligible amount of CPU.  I just tried a portion of the query above, I found the same thing you found.  My Task Manager also confirmed that PowerShell, while open, was using 0% of the CPU.

To answer the question, because it uses very little CPU unless you have a heavy command running (e.g., in a separate window).

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bibi92Author Commented:
The PowerShell commands operate on processes named "PowerShell" . Thanks regards
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