Hello, dear coleagues.

As I know workflows are not executed in strict order. For example, 

workflow Test-WFConnection {

  param(

    [string[]]$Computers

  )

    foreach -parallel -ThrottleLimit 20 ($computer in $computers) {
        write-host "PC name: " $Computers
}

Test-WFConnection -Computers $Computers

Of course, you know that names of PCs will be output in console not in order they will input.

Quote from PowerShell Workflows: The Basics: 

If you are running workflow activities in parallel there are no guarantees as to the order in which data will be returned. 
You cannot assume that one piece of data will be returned before another.

That means, there is now way to dicrease time of execution, if you need to follow strict order?

Thanks.

Just because a workflow won't do it doesn't mean it can't be done.  

While it is more work to code, you can use runspaces to run tasks in parallel and control the order that the data will be returned.

http://blogs.technet.com/b/heyscriptingguy/archive/2013/09/29/weekend-scripter-max-out-powershell-in-a-little-bit-of-time-part-2.aspx

What is the point of a workflow that does not use parallelism.  If you want order to the output just sort it.

Hello, this is bad example I wrote, but I need to know if powershell can execute script in parallel but in strict order of input and output data. Thanks. 

Impossible to do.  Parallel says start all processes at the same time.  They will complete when they are done and totally independently.

If you want order do not use a workflow.

Understand, but only workflows allow parallel execution of script?

Understand, but only workflows allow parallel execution of script?

No, you can run parallel execution in runspaces, and control the order in that the data will be returned from

Guys, thanks for your answer.

So I asked the abstract question, this discussion can be closed. 

I'll try to write script and ask for your help in case of specific problems.

Have a nice day.