#requires -version 2.0 

#Jeffery Hicks
#http://jdhitsolutions.com/blog

#Now available: 
#Windows PowerShell 2.0: TFM by Don Jones & Jeffery Hicks (SAPIEN Press 2010)

Function Get-PerfTime {
Param ([scriptblock]$expression,
       [int]$interval=1,
       [int]$max=10
      ) 

    1..$max | foreach {
        $i=($_/$max)*100
        Write-Progress -Activity "Performance Testing" `
        -Status "Repeat: $max Interval: $interval MS" `
        -CurrentOperation $expression `
        -PercentComplete $i
        (Measure-Command -Expression $expression).TotalMilliseconds
        sleep $interval
    }
} #end function

#edit these values
$computername="coredc01"
#sleep interval in seconds
$sleep=1
#max number of tries
$max=100
#create a PSSession for later
$session=New-PSSession -ComputerName $computername

#define a standard scriptlblock with a cmdlet that supports -computername
$Test1={get-process -ComputerName $computername }
#define a WMI equivalent
$Test2={Get-WmiObject -Class win32_process -ComputerName $computername}
#define a test using Invoke-Command. You can reuse
$Test3={invoke-command -ComputerName $computername -ScriptBlock {$Test1}}
#define a test with Invoke-Command and PSSession
$Test4={invoke-command -Session $session -ScriptBlock {$Test2}}
$Test5={invoke-command -Session $session -ScriptBlock {$Test1}}

#get data
$Test1,$Test2,$Test3,$Test4,$Test5 | foreach {
    $raw=Get-PerfTime -max $max -expression $_ -sleep $sleep 
    $avg=($raw | Measure-Object -average).Average

    New-Object PSObject -Property @{
        Computername=$computername
        Repeat=$max
        Expression=$_
        Average=$avg
        RawData=$raw
    } 
} #end ForEach

#clean up the PSSession
Remove-PSSession $session

write-host "Finished!" -ForegroundColor Green
#end of script