- 1 year ago
No parallelization despite the use of a runspace pool with powershell 5.1
In PowerShell 5.1, the RunspacePool
class is not designed to provide true parallelization for executing commands. While it allows for concurrent execution of commands using multiple runspaces, it does not offer true parallel processing.
If you need parallel processing in PowerShell 5.1, you can consider using background jobs or workflows. Here's an example using background jobs:
powershell$scriptBlock = {
Param($inputFile)
# Your script logic here
# Process the input file
# ...
# Output the result
"Processed: $inputFile"
}
$inputFiles = Get-ChildItem -Path "C:\Path\to\Files" -File
$jobList = foreach ($inputFile in $inputFiles) {
Start-Job -ScriptBlock $scriptBlock -ArgumentList $inputFile
}
# Wait for all jobs to complete
Wait-Job -Job $jobList | Out-Null
# Retrieve the results
$results = Receive-Job -Job $jobList
# Display the results
$results
In the above example, we define a script block $scriptBlock
that represents the logic you want to execute in parallel. We then retrieve a list of input files, and for each file, we start a background job using Start-Job
with the script block and the input file as arguments.
We use Wait-Job
to wait for all the jobs to complete before retrieving the results with Receive-Job
. Finally, we display the results.
Keep in mind that background jobs have some overhead in terms of resource usage, so using them with a large number of tasks might not be ideal. PowerShell 7 introduced the ForEach-Object -Parallel
cmdlet, which provides true parallel processing, so you might consider upgrading to PowerShell 7 if possible.
Note: PowerShell 7 is a separate installation from Windows PowerShell 5.1 and is not included by default on Windows 10. You can download and install PowerShell 7 from the official PowerShell GitHub repository.