getAllVMsOfCluster slowness vs Get-VM

Hi all,

I'm trying to convert a simple PowerCLI script to a vCO flow (or actions in the future, when debug will be available for them...)

The PowerCLI script is very simple, it loops through all the VMs of a cluster, and output the average vRAM / vCPU per VM.

The problem is that the action getAllVMsOfCluster take an awfull lot of time (more than 3 min !) to return on a cluster with ~200 VMs, whereas the Get-VM cmdlet on the same cluster take 10-20sec.

I think that the Get-VM cmdlet uses a view and the getAllVMsOfCluster Action simply loops through the objects return by the sdk/mob...

Is there a way to speed the process (other than using the PowerShell plug-in, which I'm trying to avoid as much as possible).

Below is the PowerShell and the vCO version of this simple script:

Here is the PowerCLI script:

$clusterName = "MyCluster"

$cluster = Get-Cluster -Name $clusterName

$vms = $cluster | Get-VM

$nbVMs = $vms.length

$nbvCPUs = 0

$nbvRAM = 0

foreach ($vm in $vms)

{

  $nbvCPUs += $vm.NumCpu

  $nbvRAM += $vm.MemoryMB

}

$nbvRAM = $nbvRAM / 1024

$nbvRAM = $nbvRAM / 1024

$avgvRAMPerVM = $nbvRAM / $nbVMs

$avgvCPUPerVM = $nbvCPUs / $nbVMs

Write-Host "nbVMs: $nbVMs"

Write-Host "nbvCPUs: $nbvCPUs"

Write-Host "nbvRAM: $nbvRAM"

Write-Host "avgvRAMPerVM: $avgvRAMPerVM"

Write-Host "avgvCPUPerVM: $avgvCPUPerVM"

I converted this to a vCO flow that looks like this :

Input:

     cluster as VC:ClusterComputeResource

Output:

     avgvRAMPerVM as number

     avgvCPUPerVM as number

Flow:

     Action: getAllVMsOfCluster

          Input: Flow Input "cluster"

          Output: Flow Attribute "vms" as Array of VC:VirtualMachine

     Scriptable Task: "Do the maths"

          Input: Flow Attribute "vms" as Array of VC:VirtualMachine

          Output:

               Flow Output avgvRAMPerVM

               Flow Output avgvCPUPerVM

          Script:

               var nbVMs = vms.length;

               var nbvCPUs = 0;

               var nbvRAM = 0;

               for (var i in vms)

               {

                 nbvCPUs += vms[i].config.hardware.numCPU;

                 nbvRAM += vms[i].config.hardware.memoryMB;

               }

               nbvRAM = nbvRAM / 1024;

               avgvRAMPerVM = nbvRAM / nbVMs;

               avgvCPUPerVM = nbvCPUs / nbVMs;

               System.log("nbVMs: " + nbVMs);

               System.log("nbvCPUs: " + nbvCPUs);

               System.log("nbvRAM: " + nbvRAM);

               System.log("avgvRAMPerVM: " + avgvRAMPerVM);

               System.log("avgvCPUPerVM: " + avgvCPUPerVM);