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I have several directories (jobs) (> 50) in ` C:/tmp` on my Windows 10 (x64, 8 CPUs) PC. Each directory contains an EXE file (my_file.exe) and other files as inputs to EXE. I can run this EXE via Windows CLI like this:

C:/tmp/my_file.exe my_inputs.txt

The EXE file runs and produces output in each directory (`my_output.txt`).

To run 7 jobs, I do the following:

C:/tmp/my_file.exe my_inputs1.txt
C:/tmp/my_file.exe my_inputs2.txt
C:/tmp/my_file.exe my_inputs3.txt

Instead of manually running 7 jobs again and again (7 jobs = 7 CPUs keeping some PC resources for the other processes), I would like to automate this procedure.

In PowerShell, is there a way such that, I could run 7 EXEs (7 CPUs) (starting from directory 1) at the same time, keeping an "eye" on whether a job is finished (probably by monitoring `output.txt` in each directory), kill that process, and start the new EXE in the queue, until all EXEs in all the directories have been executed and produced the outputs?
Top Answer
# PowerShell 6/7 (Core)

PowerShell Core introduces the `ForEach -Parallel` construct (along with its own implementation woes). 

1 .. 7 | ForEach-Object -Parallel {
    $number = $_
    0 .. 10 | % {
        echo (Get-Date).ToString() >> "C:\Temp\${number}.v7.txt"
        Start-Sleep 1

Note this example implementation requires >20 seconds of wall clock time.

Answer #2
# PowerShell 5 (Desktop)

#Requires -PSEdition Desktop

workflow foo {
    foreach -Parallel ($number in (1 .. 7)) {
        1 .. 10 | % {
            echo (Get-Date).ToString() >> "C:\Temp\${number}.txt" 
            Start-Sleep 1 


Much like `function foo {}` defines an executable script, `workflow foo{}` defines a parallel [workflow]( Invoking `foo` must be called separately after defining what `foo` is. 

`Measure-Command {foo}` shows us that only 10 seconds of wall clock time have passed, but 7 files exist in `C:\Temp` named `1.txt` through `7.txt`


Fair warning: Desktop edition workflows are a bit of a pain in the butt to work with IMHO. Note in the preceding example, `echo` isn't a true binary call but an alias to `Write-Output`, debugging specific workflow implementations is a whole other beast. 

Scoping issues with the [`InlineScript {}`]( block type may be an issue for you with this usage depending on usage.

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