PowerShell - Get Average Memory Usage of Server - powershell

Question

I am running an instance of Windows Server 2012 R2 and would like to get the average memory usage of my server.
To get the CPU usage, I use
Get-WmiObject win32_processor | select LoadPercentage |fl
and to get the average CPU usage, I have
Get-WmiObject win32_processor | Measure-Object -property LoadPercentage -Average | Select Average
How do I do the same thing with memory usage?

Answer 1

You want the Win32_OperatingSystem namespace, and it's TotalVisibleMemorySize (physical memory), FreePhysicalMemory, TotalVirtualMemorySize, and FreeVirtualMemory properties.
Get-WmiObject win32_OperatingSystem |%{"Total Physical Memory: {0}KB`nFree Physical Memory : {1}KB`nTotal Virtual Memory : {2}KB`nFree Virtual Memory : {3}KB" -f $_.totalvisiblememorysize, $_.freephysicalmemory, $_.totalvirtualmemorysize, $_.freevirtualmemory}
That will spit back:
Total Physical Memory: 4079572KB
Free Physical Memory : 994468KB
Total Virtual Memory : 8157280KB
Free Virtual Memory : 3448916KB
I'm sure you can do the math if you want to get Used instead of Free.
Edit: Your CPULoad Average isn't really an average of anything. Case in point:
For($a=1;$a -lt 30;$a++){
Get-WmiObject win32_processor|ForEach{
[pscustomobject][ordered]#{
'Average' = $_ | Measure-Object -property LoadPercentage -Average | Select -expand Average
'Current' = $_ | select -expand LoadPercentage
}
}
Start-Sleep -Milliseconds 50
}
Results:
Average CPU Load
------- --------
2 2
1 1
1 1
1 1
1 1
5 5
1 1
1 1
0 0
1 1
1 1
1 1
2 2
4 4
0
1 1
7 7
24 24
1 1

Answer 2

If you want an average over a period of time you could use performance counters
### Get available memory in MB ###
$interval = 1 #seconds
$maxsamples = 5
$memorycounter = (Get-Counter "\Memory\Available MBytes" -maxsamples $maxsamples -sampleinterval $interval |
select -expand countersamples | measure cookedvalue -average).average
### Memory Average Formatting ###
$freememavg = "{0:N0}" -f $memorycounter
### Get total Physical Memory & Calculate Percentage ###
$physicalmemory = (Get-WMIObject -class Win32_PhysicalMemory | Measure-Object -Property capacity -Sum).Sum / 1mb
$physicalmemory - $freememavg

Answer 3

Function Get-ADtop {
[CmdletBinding()]
param(
[String]$ComputerName,
[String]$Sort = "none",
[String]$BaseDN = "OU=systems,DC=domain,DC=com", # Edit Default Base DN
[String]$SampleTime = 2
)
If ($ComputerName) {
$Computers = $ComputerName
} else {
$Computers = Get-ADComputer -Filter * -Properties * -SearchBase $BaseDN -EA SilentlyContinue | % {$_.Name}
}
$DataSet = #()
$Targets = #()
ForEach ($Comp in $Computers) {
If (Test-Connection -ComputerName $Comp -Count 1 -Quiet -TimeToLive 1 -EA SilentlyContinue) {
If (!(Get-WmiObject -ComputerName $Comp win32_OperatingSystem -EA SilentlyContinue)) { break }
$Targets += $Comp
}
}
$CompCount = $Computers | Measure-Object | % {$_.Count}
$DeadCount = $CompCount - ($Targets | Measure-Object | % {$_.Count})
If (!($DeadCount -eq 0)) {
Write-Host "`n$DeadCount unavailable computers removed"
}
Write-Host "`nGathering realtime CPU/MEM/DISK Usage data from $CompCount computers..."
ForEach ($Comp in $Targets) {
$proc = (Get-WmiObject -ComputerName $Comp -class win32_processor -EA SilentlyContinue | Measure-Object -property LoadPercentage -Average | Select Average | % {$_.Average / 100}).ToString("P")
$mem = Get-WmiObject -ComputerName $Comp win32_OperatingSystem -EA SilentlyContinue
$mem = (($mem.TotalVisibleMemorySize - $mem.FreePhysicalMemory) / $mem.TotalVisibleMemorySize).ToString("P")
$disk = Get-WmiObject -ComputerName $Comp -class Win32_LogicalDisk -filter "DriveType=3" -EA SilentlyContinue
$disk = (($disk.Size - $disk.FreeSpace) / $disk.Size).ToString("P")
$Info = [pscustomobject]#{
'Computer' = $Comp
'CPU Usage' = $proc
'MEM Usage' = $mem
'Disk Usage' = $disk
}
$DataSet += Add-Member -InputObject $Info -TypeName Computers.CPU.Usage -PassThru
}
Switch ($Sort) {
"none" { $DataSet }
"CPU" { $DataSet | Sort-Object -Property "CPU Usage" -Descending }
"MEM" { $DataSet | Sort-Object -Property "MEM Usage" -Descending }
"DISK" { $DataSet | Sort-Object -Property "DISK Usage" -Descending }
}
}
More info here GitHub Gist Link