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PowerShell Get Memory Usage

Very often, PowerShell administrators have to scan servers manually to see the performance issue with a server in the network. It might be possible that one of the servers was not responding or unresponsive and caused performance issues on dependent servers. In this kind of scenario, having information memory usage for servers will help to identify which specific server has higher memory utilization.

Use PowerShell Get-WMIObject command to get memory usage on the computer. There are multiple ways to get memory utilization on the local computer or remote computer in PowerShell.

In this article, I will explain how to get memory usage for servers using PowerShell.

PowerShell Get Memory Usage

To get memory usage for the top 10 processes on a local computer using PowerShell, use the below command

PS D:\PowerShell> Get-WmiObject WIN32_PROCESS | Sort-Object -Property ws -Descending | Select-Object -first 10 ProcessID,Name,WS

ProcessID Name                      WS
--------- ----                      --
     2628 Memory Compression 909996032
    11984 chrome.exe         470863872
    15728 firefox.exe        356192256
    14444 chrome.exe         332091392
    16680 firefox.exe        315645952
    11812 chrome.exe         311554048
    22072 Teams.exe          242507776
    11256 firefox.exe        221163520
    27052 powershell_ise.exe 213434368
    25612 chrome.exe         211025920

In the above PowerShell script,

  • using Get-WMIObject cmdlet and WIN32_Process class it gets information about all processes on the local computer.
  • Sort all processes descending by WS
  • Using Select-Object to get the first 10 process id, process names, and WS
  • It gets memory usage of the top 10 processes

The output of the above PowerShell script retrieves the process memory usage.

PowerShell Get memory Utilization
PowerShell Get memory Utilization (local)

As you can see from the above information we get an idea about which processes are having higher memory usage but it’s very difficult to know how much memory usage in percentage these processes will be utilizing.

Cool Tip: How to create a resource pool for measuring memory usage of VM!

To get total memory usage in percentage on the computer, we need to know how much TotalVisibleMemorySize and FreePhysicalMemory are available on the system.

Run the below command to get process memory usage in MB on the local computer

 # Get Computer Object
 $CompObject =  Get-WmiObject -Class WIN32_OperatingSystem
 $Memory = ((($CompObject.TotalVisibleMemorySize - $CompObject.FreePhysicalMemory)*100)/ $CompObject.TotalVisibleMemorySize)
 
 Write-Host "Memory usage in Percentage:" $Memory
        
 # Top 5 process Memory Usage (MB)
 $processMemoryUsage = Get-WmiObject WIN32_PROCESS | Sort-Object -Property ws -Descending | Select-Object -first 5 processname, @{Name="Mem Usage(MB)";Expression={[math]::round($_.ws / 1mb)}}
 $processMemoryUsage
 
Output:

Memory usage in Percentage: 78.134547088066

ProcessName        Mem Usage(MB)
-----------        -------------
Memory Compression          1032
chrome.exe                   373
Teams.exe                    370
firefox.exe                  315
chrome.exe                   307

In the above PowerShell script,

  • Using Get-WmiObject -Class Win32_OperatingSystem get the local computer object
  • Get information about TotalVisibleMemorySize and FreePhysicalMemory
  • Calculate and get memory usage in percentage
  • Using Win_32_Process gets the process, sorted by ws descending
  • Using Select-Object to get top 5 process memory usage
  • Easy to read and interpret which processes have higher memory usage.

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PowerShell Get Memory Usage on Remote Computer

To get memory usage for the top 10 processes on a remote computer using PowerShell, use the below command

PS D:\PowerShell> Get-WmiObject WIN32_PROCESS -ComputerName 'corp-in-18' | Sort-Object -Property ws -Descending | Select-Object -first 5 ProcessID,Name,WS
>>

ProcessID Name                      WS
--------- ----                      --
    12628 Memory Compression 913199104
    10522 chrome.exe         438820864
    17292 Outlook.exe          393461760
    26529 firefox.exe        354979840
    23133 chrome.exe         325996544

In the above PowerShell script,

  • using Get-WMIObject cmdlet and WIN32_Process class it gets information about all processes on remote compute name specified by –ComputerName property
  • Sort all processes descending by WS
  • Using Select-Object to get the first 5process id, process name,s and WS
  • It gets memory usage of the top 5 processes

To get total memory usage in percentage on a remote computer, get TotalVisibleMemorySize and FreePhysicalMemory available on the system.

Run the below command to get process memory usage in MB on the remote computer.

 $CompName  = 'corp-in-18'
 # Get Computer Object
 $CompObject =  Get-WmiObject -Class WIN32_OperatingSystem -ComputerName $CompName 
 $Memory = ((($CompObject.TotalVisibleMemorySize - $CompObject.FreePhysicalMemory)*100)/ $CompObject.TotalVisibleMemorySize)
 
  Write-Host "Memory usage in Percentage:" $Memory
 # Top 5 process Memory Usage (MB)
 $processMemoryUsage = Get-WmiObject WIN32_PROCESS -ComputerName $CompName  | Sort-Object -Property ws -Descending | Select-Object -first 5 processname, @{Name="Mem Usage(MB)";Expression={[math]::round($_.ws / 1mb)}}
 $processMemoryUsage
Output

Memory usage in Percentage: 77.2521027641826

ProcessName        Mem Usage(MB)
-----------        -------------
Memory Compression          1105
chrome.exe                   358
firefox.exe                  318
chrome.exe                   302
firefox.exe                  290

In the above PowerShell script,

  • Using the Get-WmiObject cmdlet gets a remote computer object specified by ComputerName
  • Get information about TotalVisibleMemorySize and FreePhysicalMemory
  • Calculate and get memory usage in percentage
  • Using Win_32_Process gets the all processes on the remote computer, sorted by ws descending
  • Using Select-Object to get top 5 process memory usage

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PowerShell Get RAM Usage

To get RAM size usage in Windows using PowerShell, you can use the Get-Counter command to retrieve the performance counter data related to memory usage.

 Get-Counter -Counter "\Memory\Committed Bytes" | Select-Object -ExpandProperty CounterSamples | ForEach-Object { "{0:N2} GB" -f ($_.CookedValue / 1GB) } 

In the above PowerShell script, the Get-Counter command retrieves the amount of committed memory in bytes and later converts it to gigabytes (GB).

The above command provides the amount of committed memory, which is a portion of the RAM that is actively being used by running processes.

Conclusion

I hope the above article to get memory usage on the local computer or remote computer using PowerShell script will help you to get memory usage information and take action on it.

Using Win32_Process class, it returns all processes available on the computer specified by ComputerName.

You can find more topics about PowerShell Active Directory commands and PowerShell basics on the ShellGeek home page.

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