Parallel and Sequence Execution in PowerShell Workflow

PowerShell workflows are the best way to design the script to execute on more than one node parallel which saves extensive time for the output to produce but we always don’t want to run all the commands parallel but also need some of them to run sequentially and we can design both Parallel and Sequence commands using PowerShell Workflow.

Workflow TestWorkflow{
   parallel{
      Command1
      Command2
   }
   Sequence{
      Command3
      Command4
   }
}

TestWorkflow

In the above code, Command1, Command2 will be executed parallelly in any order while command3 and command4 will be executed in a serial manner because they are inside the sequence block as shown with the below example.

Example

Workflow TestWorkflow{
   parallel{
      Get-CimInstance Win32_LogicalDisk
      Get-CimInstance Win32_BIOS
   }
   sequence{
      Get-Service WinRM
      Get-Process Notepad++
   }
}

TestWorkFlow

Output

TestWorkFlow

SMBIOSBIOSVersion : F.13
Manufacturer     : AMI
Name : F.13
SerialNumber : 5CD015JY8D
Version : HPQOEM - 1072009
PSComputerName :

DeviceID : C:
DriveType : 3
ProviderName :
FreeSpace : 219602677760
Size : 511123124224
VolumeName : OSDisk
PSComputerName :

Status : Running
Name : WinRM
DisplayName : Windows Remote Management (WS-Management)
PSComputerName : localhost

Id : 676
Handles : 738
CPU : 15.875
Name : notepad++
PSComputerName : localhost