PowerShell script to calculate the memory usage per user - powershell

Question

We have an environment of 240 VMs. Clients are using ICA/RDP connection to connect to these servers. Sometimes users are hogging the memory and causing the slowing and crash on that particular server.
I would like to have a PowerShell script to calculate the memory usage for each user connected to the server. I spent hours and hours searching and trying different scripts but was not successful.
Some scripts giving me the working sets value using Get-WmiObject Win32_Process and GetOwner(). but the calculation is not correct.
What I need is exactly the format that I can see in the users tab in Task Manager. The main information which I need is the memory usage, but it would be nice to have the disk and CPU usage per user as well.
Here is the code which i am using. When i run this script after a minute or two It returns an error which says $.GetOwner() can not be found and in another line it gives me the user name which utilizing the memory more than the others but the calculation is not correct when i compare it with TaskManager user's tab.
$h = #{}
get-wmiobject win32_process | foreach {
$u = $_.getowner().user;
if ( $u -ne $null)
{
if ( !$h.ContainsKey($u) )
{
$h.add( $u, $_.WS);
}
else
{
$h.item($u) = $h.item($u) + $_.WS;
}
}
}
$h.GetEnumerator() | sort value -desc

Answer 1

try this:
get-wmiobject win32_process |
select #{N='User';E={$_.getowner().user}}, WorkingSetSize |
group user |
select Name, #{N='CPU';E={($_.Group.WorkingSetSize | Measure-Object -Sum).Sum / 1Mb }}

Answer 2

gwmi win32_process |
select #{N='User';E={$_.getowner().user}},WorkingSetSize |
group User | select Name,#{N='RAM';E={[math]::Round(($_.Group.WorkingSetSize | Measure-Object -Sum).Sum/1MB) }} |
sort RAM -Descending | select -first 1 ;