Runspaces - specifically, you can use invoke-parallel (https://github.com/RamblingCookieMonster/Invoke-Parallel). I use it all the time for multi-threading.
Something to keep in mind - += is ok for small datasets, but is pretty evil on very large datasets. Basically, when you do a +=, it doesn't just add to the array, it deletes the array and recreates it with the new member. Probably doesn't matter for an ACL list on a file, but if you are working with hundreds of thousands of items, it can hurt performance pretty bad. From: listsad...@lists.myitforum.com [mailto:listsad...@lists.myitforum.com] On Behalf Of Todd, Jason Sent: Tuesday, August 02, 2016 4:33 AM To: powershell@lists.myitforum.com Subject: [EXTERNAL] [powershell] Make GET-ACL quicker? Hello All, I'm hoping someone can help me out with making GET-ACL quicker? Scenario: I need to use Get-Acl on over 1million files and folders in a directory root, and then filter on just the ones which have Inheritance set to $false. This is my current code (which take days to run!): ## Loop each file and folder in RootPath Foreach ($Item in $FilesAndFolders){ TRY{ Write-Verbose -message "[TRY] Getting ACLs for: $item" -verbose $ACLs = get-acl $Item.fullname | ForEach-Object {$_.Access} Foreach ($ACL in $ACLs){ $ObjectOut = New-Object -TypeName PsObject $ObjectOut | Add-Member -MemberType NoteProperty -Name "Path" -Value $Item.FullName.ToString() $ObjectOut | Add-Member -MemberType NoteProperty -Name "IdentityReference" -Value $ACL.IdentityReference.ToString() $ObjectOut | Add-Member -MemberType NoteProperty -Name "AccessControlType" -Value $ACL.AccessControlType.ToString() $ObjectOut | Add-Member -MemberType NoteProperty -Name "InheritanceFlags" -Value $ACL.InheritanceFlags $ObjectOut | Add-Member -MemberType NoteProperty -Name "PropagationFlags" -Value $ACL.PropagationFlags $ObjectOut | Add-Member -MemberType NoteProperty -Name "FileSystemRights" -Value $ACL.FileSystemRights.ToString() $ObjectOut | Add-Member -MemberType NoteProperty -Name "IsInherited" -Value $ACL.IsInherited $ACLList += $ObjectOut } } CATCH{ Write-Warning "[CATCH] ERROR getting ACL for $($item.fullname)" -Verbose $ACLErrorsLog += "ERROR getting ACL for $($item.fullname)" } Does anyone know a way to speed up the getting of ACL's, maybe by filtering out the non-inherited objects ? 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