Examine VMware CPU Ready Times with Powershell

By On June 12, 2009 · 10 Comments

When your (VMware) consolidation ratios are becoming high, it might be smart to keep an eye on your vm’s CPU Ready Times. Unfortunately, by default, the VI Client will only show realtime ready time statistics. Plus you’d have to look at each vm individually. Thank God VMware for the PowerCLI! Read this document for more information on how to interpret the results.

# Variables
$OutFile = "D:\Scripts\ReadyTimes.csv"
$VIServer = "MyVIServer.domain.local"
 
# Connect to Virtual Center
$VI = Connect-VIServer $VIServer
 
$myCol = @()
ForEach ($VMHost in (Get-VMHost | Sort Name))
	{
	ForEach ($VM in ($VMHost | Get-VM | Sort Name))
		{
		# Gather Stats
		$Ready = $VM | Get-Stat -Stat Cpu.Ready.Summation -RealTime
		$Used = $VM | Get-Stat -Stat Cpu.Used.Summation -RealTime
		$Wait = $VM | Get-Stat -Stat Cpu.Wait.Summation -RealTime
		For ($a = 0; $a -lt $VM.NumCpu; $a++)
			{
			$myObj = "" | Select VMHost, VM, Instance, %RDY, %USED, %WAIT
			$myObj.VMHost = $VMHost.Name
			$myObj.VM = $VM.Name
			$myObj.Instance = $a
			$myObj."%RDY" = [Math]::Round((($Ready | Where {$_.Instance -eq $a} | Measure-Object -Property Value -Average).Average)/200,1)
			$myObj."%USED" = [Math]::Round((($Used | Where {$_.Instance -eq $a} | Measure-Object -Property Value -Average).Average)/200,1)
			$myObj."%WAIT" = [Math]::Round((($Wait | Where {$_.Instance -eq $a} | Measure-Object -Property Value -Average).Average)/200,1)
			$myCol += $myObj
			}
		Clear-Variable Ready -ErrorAction SilentlyContinue 
		Clear-Variable Wait -ErrorAction SilentlyContinue 
		Clear-Variable Used -ErrorAction SilentlyContinue 
		Clear-Variable myObj -ErrorAction SilentlyContinue
		}
	}
 
Disconnect-VIServer -Confirm:$false
 
# Export and launch output
$myCol | Export-Csv $OutFile
Invoke-Item $OutFile

»crosslinked«

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10 Responses to Examine VMware CPU Ready Times with Powershell

  1. javellan says:
    June 12, 2009 at 11:39 pm

    thx! this is really powerful and useful for my environment!
    -ja

    Reply
  2. Turbo Talk » Three secrets of the Uber-Virtualized says:
    January 29, 2010 at 4:08 am

    [...] (By the way, here is a nice Powershell script that will grab CPU Ready stats for all of your VMs!) [...]

    Reply
  3. Steve says:
    April 13, 2010 at 5:17 pm

    Thanks — I was looking at trying to write something like this myself – Now I get the credit without the work :-)

    Reply
  4. Sven says:
    April 14, 2010 at 11:25 am

    would be nice if the script would exclude powerd off vm’s

    -Sven

    Reply
    • admin says:
      April 14, 2010 at 11:48 am

      That’s rather easy. Simply replace this line:
      ForEach ($VM in ($VMHost | Get-VM | Sort Name))
      With this:
      ForEach ($VM in ($VMHost | Get-VM | Where {$_.PowerState -ne “PoweredOff”} | Sort Name))

      Hugo

      Reply
  5. Mike says:
    May 11, 2011 at 3:51 pm

    Nice script, but when running in a 1500 VM enviroment it takes a long time for the script to finish.

    Reply
  6. Получение значений CPU Ready через PowerCLI | Виталий Волнянский - Персональный блог says:
    June 17, 2011 at 5:35 am

    [...] времени, чтобы написать эту статью Источник <http://www.peetersonline.nl/index.php/vmware/examine-vmware-cpu-ready-times-with-powershell/&gt; wpa2a.script_load(); Categories: vmware, Виртуализация Tags: CPU Ready, PowerCLI, [...]

    Reply
  7. Is the HP power setting impacting your performance? | www.vExperienced.co.uk says:
    January 4, 2012 at 4:03 pm

    [...] Examine VMware CPU Ready Times with Powershell Categories: Uncategorized Tags: Comments (0) Trackbacks (0) Leave a comment Trackback [...]

    Reply
  8. Chris McEwan says:
    February 15, 2013 at 11:38 am

    Id like to see an extra column of CPU ready time in Milliseconds. AND to be able to run this over a month or year instead of using the realtime.

    Reply
    • Chris McEwan says:
      February 15, 2013 at 11:52 am

      Answered one part myself Added

      $Time = $VM | Get-Stat -Stat Cpu.Ready.Summation -RealTime

      And

      $myObj = “” | Select VMHost, VM, Instance, %RDY, %USED, %WAIT, %TIME

      and

      $myObj.”%TIME” = [Math]::Round((($Time | Where {$_.Instance -eq $a} | Measure-Object -Property Value -Average).Average))

      to get time in milliseconds.

      Just need to figure out how i can do this over the past month

      Reply