Get-CimInstance – the WMI Champion

Quick one – inspired by today’s Power Tip on Powershell.com, I ran a comparison of different methods of getting data from WMI on a remote computer and the execution time of each.  The results were interesting, with Get-CimInstance the clear winner.

I retrieved the full property list for the Win32_Processor class from a remote computer with a ~290ms latency.

capture


$ComputerName = "remoteserver-01"

## 4.54 Seconds # Get-CimInstance
[math]::Round($(Measure-Command -Expression {Get-CimInstance -ClassName Win32_Processor -ComputerName $ComputerName -Property *} |
    Select -ExpandProperty TotalSeconds),2)

## 4.59 Seconds # Get-CimInstance in WSMan Session
[math]::Round($(Measure-Command -Expression {
$option = New-CimSessionOption -Protocol Wsman
$session = New-CimSession -SessionOption $option -ComputerName $ComputerName
Get-CimInstance -ClassName Win32_Processor -CimSession $session -Property *
Remove-CimSession -CimSession $session
}| Select -ExpandProperty TotalSeconds),2)

## 7.68 Seconds # Invoke-Command / Get-CimInstance
[math]::Round($(Measure-Command -Expression {invoke-command -ComputerName $ComputerName -scriptblock {Get-CimInstance -ClassName Win32_Processor -Property *}} |
    Select -ExpandProperty TotalSeconds),2)

## 8.37 Seconds # Invoke-Command / Get-WMIObject
[math]::Round($(Measure-Command -Expression {invoke-command -ComputerName $ComputerName -scriptblock {Get-WmiObject -Class Win32_Processor -Property *}} |
    Select -ExpandProperty TotalSeconds),2)

## 11.04 Seconds # Get-CimInstance in Dcom session
[math]::Round($(Measure-Command -Expression {
$option = New-CimSessionOption -Protocol Dcom
$session = New-CimSession -SessionOption $option -ComputerName $ComputerName
Get-CimInstance -ClassName Win32_Processor -CimSession $session -Property *
Remove-CimSession -CimSession $session
}| Select -ExpandProperty TotalSeconds),2)

## 15.31 Seconds # Get-WmiObject
[math]::Round($(Measure-Command -Expression {Get-WmiObject -Class Win32_Processor -ComputerName $ComputerName -Property *} |
    Select -ExpandProperty TotalSeconds),2)

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