Run N parallel jobs in powershell

source: https://stackoverflow.com/questions/8781666/run-n-parallel-jobs-in-powershell

The Start-Job cmdlet allows you to run code in the background. To do what you’d ask, something like the code below should work. Use Wait-Job -Any to emulate throttle.

foreach ($server in $servers) {
    $running = @(Get-Job | Where-Object { $_.State -eq 'Running' })
    if ($running.Count -le 8) {
        Start-Job {
             Add-PSSnapin SQL
             $list = invoke-sqlcmd 'exec getOneMillionRows' -Server...
             ...
        }
    } else {
         $running | Wait-Job
    }
    Get-Job | Receive-Job
}