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PowerShell MultiThreading Examples
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| #Make new CSV File | |
| $CSVFileName = "\\networkshare\folder\filename.csv" | |
| "CSV,Header,With,Well,Named,Data,Columns" > $CSVFileName | |
| $Timestamp = get-date -format o | |
| #Log file | |
| $LogFileName = "\\networkshare\folder\logfile_$Timestamp.log" | |
| #Function to do stuff with IP address | |
| $SomeFunction = { | |
| param($IPAddress,$CSVFileName,$LogFileName) | |
| #do stuff with $IPAddress | |
| #To simulate some actual processing | |
| Sleep -s 1 | |
| #format output for CSV file | |
| $CSVOutput = "Hello,$IPAddress,My,Name,Is,Mr,Bean" | |
| $CSVOutput >> $CSVFileName | |
| #always output any errors to a log file | |
| $error >> $LogFileName | |
| } | |
| #Array of subnets in our network | |
| $Subnets = @("192.168.1.","192.168.2.","172.16.1.") | |
| #Array will use to store different networks | |
| $Networks=@() | |
| foreach($Subnet in $Subnets) | |
| { | |
| #Array will be using to store IP addresses in network | |
| $Network=@() | |
| #Build a list of IPs in that subnet | |
| $IPs = 1..254 | |
| #Populate the subnet with IPs | |
| foreach($IP in $IPs){$Network+=($Subnet + $IP)} | |
| #Add the network to the array of networks | |
| $Networks += $Network | |
| } | |
| #Get total number of IP addresses | |
| $NumIPaddresses = 0 | |
| foreach($Network in $Networks) | |
| { | |
| foreach($IP in $Network){$NumIPaddresses++} | |
| } | |
| #### Now this is where the multi threading part begins #### | |
| #Restrict Number of threads or you'll overload the server/computer | |
| $NumThreads = 20 | |
| $ThreadsProcessed = 0 | |
| foreach($Network in $Networks) | |
| { | |
| foreach($IP in $Network) | |
| { | |
| #Make sure we don't go over our maximum number of threads to process at any given time | |
| $NumJobsRunning = get-job -State Running | |
| while($NumJobsRunning.Count -ge $NumThreads) | |
| { | |
| #chill out for 30 seconds, wait for other threads to finish | |
| Sleep -s 30 | |
| $NumJobsRunning = get-job -State Running | |
| } | |
| #Start a new thread | |
| Start-Job -ScriptBlock $SomeFunction -ArgumentList $IP,$CSVFileName,$LogFileName | |
| $ThreadsProcessed++ | |
| #Lets us know how we're progressing | |
| $Status = "$ThreadsProcessed of $NumIPAddresses threads processed" | |
| echo $Status | |
| } | |
| } | |
| #Check out our fancy CSV file | |
| $CSVData = Import-CSV $CSVFileName | |
| $CSVData | Out-gridview |
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