How to execute a Powershell script in parallel

Question

I have a powershell script which is run to connect to remote servers and execute a script. I am passing an argument as well. Is there a way to run this in parallel, passing the correct ids responding to each STORES. The powershell version is 5 in the system.

$storeids = Get-Content 'D:\StoreMap.json'  -Raw | ConvertFrom-Json
$storeids | Select-Object -Property STORE, ID | ForEach-Object {
    $computer = 'IN' + $_.STORE + 'test.org'
    $ID = $_.ID
    $script = 'D:\test.ps1'
    Write-Host "Started running the script on Store" + $computer

    try {
        Invoke-Command -ComputerName $computer -FilePath $script -ArgumentList $ID
    }
    catch {
        Write-Host $_.Exception.Message
    }
}

Answer 1

You could create a hash table to lookup the ID based on the remote computers name and then call them in parallel with Invoke-Command.

Two things to note

1. Update the hostname property if the assumption is incorrect (make it match each $env:computername)
2. Update D:\test.ps1 to use the lookup table instead of the passed in argument

also see inline comments for details.

$storeids = Get-Content 'D:\StoreMap.json'  -Raw | ConvertFrom-Json

# The assumption is IN + $_.Store is exactly the remote systems computer name, stored as Hostname property
# The ComputerName property is the fqdn for the Invoke-Command call
$selectprops = '*',
                @{n='Hostname';e={"IN$($_.Store)"}},
                @{n='ComputerName';e={"IN$($_.Store)test.org"}}

# Create a lookup table. Each remote system will be able to extract their own ID from this table via it's computername
$storetable = $storeids |
    Select-Object $selectprops |
        Group-Object -Property Hostname -AsHashTable

# Instead of using a passed in argument, use $using:storetable to grab a local copy of the table and then
# reference it with $localtable[$env:computername]
# Silence errors to prevent interruption and capture any errors to $errors (appended due to +)
$icmparams = @{
    ComputerName  = $storetable.Name
    FilePath      = 'D:\test.ps1'
    ErrorAction   = 'SilentlyContinue'
    ErrorVariable = '+errors'
    ThrottleLimit = 64 # 32 by default
}

$results = Invoke-Command @icmparams

# output collected in $results
$results 

# check any errors
$errors

<# D:\test.ps1

$localtable = $using:storetable
$id = $localtable[$env:computername].ID
"Computer: $env:Computername  ID: $id"

#>