RunSpace Mount

$Worker = {
    param($Name,$webapp,$NormalizedDataSource) 
    
    Add-PSSnapin "Microsoft.SharePoint.PowerShell"
	Write-Host "Mounting $Name.name to $name.webapp"
    Mount-SPContentDatabase -WebApplication $name.webapp -Name $Name.name -DatabaseServer $name.NormalizedDataSource
	Write-Host "$Name.name has been mounted to $name.webapp"
    Start-Sleep 50
}

$MaxRunspaces = 5

$RunspacePool = [runspacefactory]::CreateRunspacePool(1, $MaxRunspaces)
$RunspacePool.Open()

$Jobs = New-Object System.Collections.ArrayList
$databases = Import-Csv "contentdbs.csv"

foreach ($item in $databases) {
    Write-Host "Creating runspace for $Item"
    $PowerShell = [powershell]::Create()
	$PowerShell.RunspacePool = $RunspacePool
    $PowerShell.AddScript($Worker).AddArgument($item) | Out-Null
    
    $JobObj = New-Object -TypeName PSObject -Property @{
		Runspace = $PowerShell.BeginInvoke()
		PowerShell = $PowerShell  
    }

    $Jobs.Add($JobObj) | Out-Null
}

while ($Jobs.Runspace.IsCompleted -contains $false) {
    Write-Host (Get-date).Tostring() "Still running..."
	Start-Sleep 1
}



Start-Transcript -Path Computer.log

Write-Host "everything will end up in Computer.log"

Stop-Transcript