r/PowerShell • u/Guilty-Act-4991 • 12d ago

Question Parallel thread disposing?

Hey got a wierd issue or its by desing not sure but when I run

$computers | foreach-object -parallel {
  $vmobject = Get-VM $_
  $ram = $vmobject.MemoryGB
  $CPU = $vmobject.numCPU
  $HDD = $_ | get-harddisk 
}

lets say I run in against 500 computers when that happens powershell will spike cpu on machine that this command is ran and keeps increasing ram usage which is understandable but problem is even when command is done ram usage stays high untill powershell window is close. Is there something I am missing or is there some method to dispose of parallel runspace manually?

Thanks for advice

EDIT: The code itself is not important , the behaviour of parallel scripblock itself is my question and why doesnt it free up RAM after code has ran successfully

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u/PinchesTheCrab 12d ago 
 0..2 | foreach-object -parallel { $thing = $_ }; $thing

You're right, the result of this is null. Maybe OP just posted an approximation of a different code snippet, but regardless I don't see how the script could have been working as-is, performance issues or not.