Chapters/scripting-at-scale/scaling-backgroundjobs.ps1
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#create a big list of names from whatever list you want to use $computers = 1..5 | ForEach-Object {Get-Content C:\scripts\servers.txt} #using nothing 52 sec #85 items 4:45 Measure-Command { $all = foreach ($item in $computers) { Test-WSMan $item } } #using background jobs 56 sec #85 items 4:32 Measure-Command { $all = @() $all += foreach ($item in $computers) { Start-Job {Test-WSMan $item} } $all | Wait-Job | Receive-Job -Keep } #basic runspace $run = [powershell]::Create() $run.AddCommand("test-wsman").addparameter("computername", $env:computername) $handle = $run.beginInvoke() $results = $run.EndInvoke($handle) $run.Dispose() #using runspaces 10sec #85 items 16 seconds Measure-Command { #initialize an array to hold runspaces $rspace = @() #create a runspace for each computer foreach ($item in $computers) { $run = [powershell]::Create() $run.AddCommand("test-wsman").addparameter("computername", $item) $handle = $run.beginInvoke() #add the handle as a property to make it easier to reference later $run | Add-Member -MemberType NoteProperty -Name Handle -Value $handle $rspace += $run } <# alternative While ($rspace.invocationStateInfo.state -contains "running") { #loop and wait } #> While (-Not $rspace.handle.isCompleted) { #an empty loop waiting for everything to complete } #get results $results = @() for ($i = 0; $i -lt $rspace.count; $i++) { $results += $rspace[$i].EndInvoke($rspace[$i].handle) } #cleanup $rspace.ForEach( {$_.dispose()}) } |