pause the script until the condition is true in powershell - powershell

Question

$vcconnect has 50 machines and I need to run this job on all 50 machines, but when I just run it, it crashes the shell.
I would like to limit the parallel execution to 10 at a point of time.
I tried a do-while but I was missing something as it executed on all 50 at same time and crashed my shell.
foreach($vci in $vcconnect){
[array]$jobstart += Start-Job -Name top2 -ArgumentList #($vci, $cred, $from, $to) -ScriptBlock $importcode
}

Answer 1

If you want to run scripts in parallel, and control the maximum number of concurrently running instances, use a RunspacePool:
# Create a RunspacePool, of maximum 10 concurrently running runspaces
$RSPool = [runspacefactory]::CreateRunspacePool(1,10)
$RSPool.Open()
# Start a new "job" for each server
$Jobs = foreach($vci in $vconnect){
$PS = [PowerShell]::Create().AddScript($importcode)
$PS.RunspacePool = $RSPool
$vci, $cred, $from, $to |ForEach-Object {
[void]$PS.AddArgument($_)
}
New-Object psobject -Property #{
Shell = $PS
ComputerName = $vci
ResultHandle = $PS.BeginInvoke()
}
}
# Wait for the "jobs" to finish
do{
Start-Sleep -Milliseconds 500
} while ($Jobs |Where-Object IsCompleted -eq $false)
# Collect results, suppress (but warn on) errors
$Results = foreach($Job in $Jobs){
$Job.Shell.EndInvoke($Job.ResultHandle)
if($Job.Shell.HadErrors){
Write-Warning "$($Job.ComputerName) had $($Job.Shell.Streams.Error.Count) errors:"
$Job.Shell.Streams.Error |Write-Warning
}
}