PowershellParallelProcessing.ps1

# ------------------------------- #
# Powershell Parallel Processing
#
# Written by Gísli Guðmundsson
# 2018
# ------------------------------- #

$Files = "C:\Temp\file1.txt","C:\Temp\file2.txt","C:\Temp\file3.txt","C:\Temp\file4.txt"
 
#Loop through the files Array
foreach($Filename in $files){
    #Check if the whofirst file exists, if so delete it
    if(Test-Path $WhoFirst){ Remove-Item $WhoFirst }

    #Scriptblock interface where it runs basically more than once.
    $ScriptBlock = {
        #Get parameters and assign to the scriptblock, this may include external data as we do in this scenario
        param($Filename)

        function newfile($Filename) {
            #Remove the files
            Remove-Item $Filename

            #Do a random loop
            $RandomLoop = Get-Random -Minimum 1 -Maximum 10
            
            #Loop through random loop
            for($i = 0;$i -lt $RandomLoop;$i++){
                #Do some calculations to slow down the process
                $Random1 = Get-Random -Minimum 1 -Maximum 1000000000000000
                $Random2 = Get-Random -Minimum 1 -Maximum 1000000000000000
                $Random = [math]::Sqrt($Random)/$Random1/$Random2*$Random1*[math]::PI
                
                #Sleep for few seconds
                $RandomSleep = Get-Random -Minimum 1 -Maximum 3
                Start-Sleep -s $RandomSleep
            }
            $Date = Get-Date
            
            $Output = "$Date`n`t$Random"
            
            #Write the output to a file
            $Output | Out-File $Filename

        }
        #Run the function, send the parameter through, which is the filename
        newfile -Filename $Filename
        $WhoFirst = "c:\temp\whofirst.txt"
        $Filename | Out-File $WhoFirst -Append
    }

    #Run the scriptblock with arguments
    Start-Job $ScriptBlock -ArgumentList $Filename

}
#Display the jobs running
While (Get-Job -State "Running") { Start-Sleep 2 }
#Remove all the finished jobs
Remove-Job *