Hi
I’m trying to mass generate *.mof Files for servers.
I made a script, which generates one Dsc configuration per server out of json file.
After the config is created, i try to mass execute these configurations.
If i run them sequentially, it takes around 30 seconds for 20 servers. If i try to use a RunspacePool for a parallel execution with 10 threads it takes up to a minute for the same amount of servers. Can anyone explain, why it’s slower with Runspaces?
#This is a modified version of the version from https://gist.github.com/proxb/803fee30f0df244fd850
# Create an array of computers to do work against
$Scripts = Get-ChildItem -Path C:\Dsc_Configurations
# Create an empty array that we'll use later
$RunspaceCollection = @()
# This is the array we want to ultimately add our information to
[Collections.Arraylist]$qwinstaResults = @()
# Create a Runspace Pool with a minimum and maximum number of run spaces. (http://msdn.microsoft.com/en-us/library/windows/desktop/dd324626(v=vs.85).aspx)
$RunspacePool = [RunspaceFactory]::CreateRunspacePool(1, 5)
# Open the RunspacePool so we can use it
$RunspacePool.Open()
# Define a script block to actually do the work
$ScriptBlock = {
Param($Script)
$queryResults = & C:\Dsc_Configurations\$Script
$queryResults
}
# Create PowerShell objects, then for each one add the unique computer name.
Foreach ($Script in $Scripts)
{
write-host $Script
# Create a PowerShell object to run add the script and argument.
# We first create a Powershell object to use, and simualtaneously add our script block we made earlier, and add our arguement that we created earlier
$Powershell = [PowerShell]::Create().AddScript($ScriptBlock).AddArgument($Script)
# Specify runspace to use
# This is what let's us run concurrent and simualtaneous sessions
$Powershell.RunspacePool = $RunspacePool
# Create Runspace collection
# When we create the collection, we also define that each Runspace should begin running
[Collections.Arraylist]$RunspaceCollection += New-Object -TypeName PSObject -Property @{
Runspace = $PowerShell.BeginInvoke()
PowerShell = $PowerShell
} #/New-Object
} #/ForEach
# Now we need to wait for everything to finish running, and when it does go collect our results and cleanup our run spaces
# We just say that so long as we have anything in our RunspacePool to keep doing work. This works since we clean up each runspace as it completes.
While ($RunspaceCollection)
{
# Just a simple ForEach loop for each Runspace to get resolved
Foreach ($Runspace in $RunspaceCollection.ToArray())
{
# Here's where we actually check if the Runspace has completed
If ($Runspace.Runspace.IsCompleted)
{
# Since it's completed, we get our results here
[void]$qwinstaResults.Add($Runspace.PowerShell.EndInvoke($Runspace.Runspace))
# Here's where we cleanup our Runspace
$Runspace.PowerShell.Dispose()
$RunspaceCollection.Remove($Runspace)
} #/If
} #/ForEach
} #/While
