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Parallel “For Each”

/ Published in: Windows PowerShell
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  1. ParallelForEach-Object(
  2.     [ScriptBlock] $Script = { param([Object] $Data) Write-Output $Data },
  3.     [Int] $Threads = 0
  4. )
  5. {
  6.  
  7.     begin {
  8.         $Jobs = @()
  9.         if ($Threads -eq 0) {
  10.             Get-WmiObject Win32_Processor | ForEach-Object { $Threads = $Threads + $_.NumberOfLogicalProcessors }
  11.         }
  12.         Write-Host "Executing $Threads thread(s)"
  13.     }
  14.  
  15.     process {
  16.         # Write-Host 'Number of jobs:' $Jobs.Length
  17.         if ($Jobs.Length -ge $Threads) {
  18.             # Write-Host 'Waiting for any job to complete'
  19.             $CompletedJob = Wait-Job $Jobs -Any
  20.             $Jobs = $Jobs -ne $CompletedJob
  21.             Receive-Job $CompletedJob
  22.             Remove-Job $CompletedJob
  23.         }
  24.         $Jobs = $Jobs + (Start-Job $Script -ArgumentList $_)
  25.     }
  26.  
  27.     end {
  28.         while ($Jobs.Length -gt 0) {
  29.             $CompletedJob = Wait-Job $Jobs -Any
  30.             $Jobs = $Jobs -ne $CompletedJob
  31.             Receive-Job $CompletedJob
  32.             Remove-Job $CompletedJob
  33.         }
  34.     }
  35.  
  36. }

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