powershell object sort descending - powershell

Question

this powershell stuff
$Processes = get-process | Group-Object -Property ProcessName
foreach($Process in $Processes)
{
$Obj = New-Object psobject
$Obj | Add-Member -MemberType NoteProperty -Name Name -Value $Process.Name
$Obj | Add-Member -MemberType NoteProperty -Name Mem -Value ($Process.Group|Measure-Object WorkingSet -Sum).Sum
$Obj | sort Mem -Descending
}
outputs the same as this
$Processes = get-process | Group-Object -Property ProcessName
foreach($Process in $Processes)
{
$Obj = New-Object psobject
$Obj | Add-Member -MemberType NoteProperty -Name Name -Value $Process.Name
$Obj | Add-Member -MemberType NoteProperty -Name Mem -Value ($Process.Group|Measure-Object WorkingSet -Sum).Sum
$Obj
}
I'm not well enough versed to know if it is in fact working but because the items are summed then it was ordered off of the first value, but because it is still sorted alphabetically I think it just isn't set to the correct value to sort. I have tried these in several different combinations
sort, sort-object, sort-object -property "Mem" -Descending, Mem, "Mem", WS, "WS", WorkingSet, #{Expression="Mem"; Descending=$true} and various permutations,
throwing the resulting $Obj to another sorted $Obj(that threw an error saying it didn't have addition $ObjS += $obj |sort etc) several other methods of calling sort on object that I didn't save or remember.
and have come to the conclusion that my error likely stems from someplace else however because of no errors being thrown I believe that my syntax is correct at least.
I'd like the output to be sorted by the memory usage of the processes (combined by same name to get total memory of similar processes,
ie all of chromes processes as just one --chrome 1650453708--
also this is on whatever powershell is with windows 7 if that helps at all

Answer 1

Here's a hint: What are you sorting here?
foreach($Process in $Processes)
{
#...
$Obj | sort Mem -Descending
}

Answer 2

Build the data set then sort.
Function Get-ProcessMemorySummary1
{
$Processes = Get-Process | Group-Object -Property ProcessName
foreach($Process in $Processes)
{
$Obj = New-Object psobject
$Obj | Add-Member -MemberType NoteProperty -Name Name -Value $Process.Name
$Obj | Add-Member -MemberType NoteProperty -Name Mem -Value ($Process.Group `
| Measure-Object WorkingSet -Sum).Sum
$Obj | sort Mem -Descending
}
}
Get-ProcessMemorySummary1 | Sort-Object Mem
Function Get-ProcessMemorySummary2
{
$Processes = get-process | Group-Object -Property ProcessName
foreach($Process in $Processes)
{
$Obj = New-Object psobject
$Obj | Add-Member -MemberType NoteProperty -Name Name -Value $Process.Name
$Obj | Add-Member -MemberType NoteProperty -Name Mem -Value ($Process.Group `
| Measure-Object WorkingSet -Sum).Sum
$Obj
}
}
Get-ProcessMemorySummary2 | Sort-Object Mem
Name Mem
---- ---
Idle 8192
smss 1277952
NisSrv 1536000
ptim 1765376
ptsrv 1945600
ONENOTEM 3014656
rundll32 3084288
Secure System 3899392
ibtsiva 4325376
SynTPHelper 4648960
fdlauncher 5128192
ssh-agent 5353472
ibmpmsvc 5521408
fdhost 6725632
...
Get-ProcessMemorySummary2 | Sort-Object Mem -Descending
Name Mem
---- ---
iexplore 1890992128
svchost 1115009024
powershell_ise 834617344
RDCMan 734556160
sqlservr 698155008
Microsoft.Photos 396951552
dwm 346951680
MsMpEng 201469952
explorer 184778752
...

Answer 3

Someone showed me a while back that using Add-Member is a resource hog. Using a PSCustomObject gives you potentially tighter code with less redundancy and allows for easy to read sorting.
Get-Process | Group-Object -Property ProcessName | ForEach-Object {
[array]$objProcesses += [PSCustomObject][ordered] #{
Name = $_.Name
Mem = $(($_.Group | Measure-Object WorkingSet -Sum).Sum)
}
}
Return $objProcesses