Powershell script to wakeup all sites in the SharePoint farm

$ErrorActionPreference = "Stop"

function Wakeup-Site{

     param(

          [Parameter(Mandatory = $true)]

          [String] $Url

     )

     $request = [System.Net.HttpWebRequest] [System.Net.WebRequest]::Create($Url)

     $request.UseDefaultCredentials = $true

     $request.Method = "GET"

     $request.Accept = "text/html"

     $request.Timeout = 120000 #2 minutes

     Write-Host "Waking up site at $Url"

     try

     {

          # Get the response of $request

          $response = [System.Net.HttpWebResponse] $request.GetResponse()

     }

     catch [Net.WebException]

     {       

    Write-Warning $_.Exception.Message

     }

     finally

     {

          if ($response)

          {

              $response.Close()

              Remove-Variable ResponseObject

          }

     }

}

if((Get-PSSnapin "Microsoft.SharePoint.PowerShell" -ErrorAction SilentlyContinue) -eq$null){

     Add-PSSnapin "Microsoft.SharePoint.PowerShell"

}

Get-SPWebApplication |%{`

     $_.Sites |% { Wakeup-Site $_.Url}

}