ABOUT_PARALLEL


SHORT DESCRIPTION

Describes the Parallel keyword, which runs the activities in a workflow in
parallel.


LONG DESCRIPTION

The Parallel keyword runs workflow activities in parallel. This keyword is
valid only in Windows PowerShell Workflow.

SYNTAX

    workflow <Verb-Noun>
    {
         Parallel
         {
              [<Activity>]
              [<Activity>]
            ...
         }
     }


DETAILED DESCRIPTION

The commands in a Parallel script block can run concurrently. The order in
which they run is not determined.

For example, the following workflow includes a Parallel script block that
runs activities that get processes and services on the computer. Because
the Get-Process and Get-Service commands are independent of each other,
they can run concurrently and in any order.

    workflow Test-Workflow
    {
        Parallel
        {
             Get-Process
             Get-Service
        }
    }

Running commands in parallel is very efficient and reduces the time it
takes to complete a workflow significantly.

To run selected commands in a Parallel script block in sequential order,
use the Sequence keyword. For more information, see about_Sequence.

To run a Parallel script block on items in a collection, use the ForEach or
ForEach -Parallel keywords.


See Also

-   about_ForEach
-   about_ForEach-Parallel
-   about_Language_Keywords
-   about_Sequence
-   about_Workflows
-   "Writing a Script Workflow"