How to Monitor Virtual Memory?

I can monitor memory and hard disk usage with the built in Monitors in ipMonitor.

Is there a probe that will monitor Virtual Memory?

I could create a custom SNMP probe on 1.3.6.1.2.1.25.2.3.1.6.5 (VM free) and check the value is less than 48959 (at least 64MB free - if my math is right).

But the problem is that the OID will be different on each server; and could change in the example below, if I unmapped drive Y: or modified the system by plugging in a USB drive

What I would like is a monitor that finds the entry in the hrStorage table that relates to the hrStorageVirtualMemory entry.

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Fodome

Hello adamd2929,

One way around this would be to use the External Process Monitor with a script to monitor the TotalVirtualMemory. A script is available here that might give you what you need:

Feel free to customize the script to meet your needs. It also includes a readme file explaining how to call it from the External Process Monitor.

Hope this helps.

Chris Foley - SolarWinds - Support Specialist
Support: 866.530.8040 | Fax: 512.857.0125
network management simplified | solarwinds.com

adamd2929

Thank you for the script.

I have modified it to measure free virtual memory and use a percentage (make my life easier):

' Usage: cscript.exe Virtual_MemCheck.vbs [REMOTESRV] [THRESHOLD]
'        [REMOTESRV]    NetBIOS, FQDN or IP address to Remote server
'        [THRESHOLD]    Minimum percent Free Virtual Memory

Option Explicit

Const THRESHOLD_EXCEEDED = 1, PASS = 0, INVALID_PARAMS = -1, OBJECT_NOT_INITIALIZED = -2

Dim lstArgs, REMOTESRV, THRESHOLD, objWMIService, resultSetSWbemObject, element

Set lstArgs = WScript.Arguments

If lstArgs.Count = 2 Then
     REMOTESRV      = Trim( lstArgs( 0 ))
     THRESHOLD    = Trim( lstArgs( 1 ))
Else
     WScript.Echo " Usage: cscript.exe Virtual_MemCheck.vbs [REMOTESRV] [THRESHOLD]"
     WScript.Echo vbTAB & "[REMOTESRV]    NetBIOS, FQDN or IP address to Remote server"
     WScript.Echo vbTAB & "[THRESHOLD]    Percent Free Virtual Memory"
     WScript.Quit( INVALID_PARAMS )
End If

Set objWMIService = GetObject("winmgmts:\\" & REMOTESRV & "\root\CIMV2")

          If( IsEmpty( objWMIService ) = True ) Then
            WScript.Echo( "OBJECT_NOT_INITIALIZED :: WMI ResultSet " )
            WScript.Quit( OBJECT_NOT_INITIALIZED )
          End If

Set resultSetSWbemObject= objWMIService.ExecQuery("SELECT * FROM Win32_OperatingSystem")

   For Each element In resultSetSWbemObject

          WScript.Echo( "Free Virtual Memory Size in KBytes: " & element.FreeVirtualMemory )
          WScript.Echo( "Total Virtual Memory Size in KBytes: " & element.TotalVirtualMemorySize )
          WScript.Echo( "Virtual Memory Free %: " & 100*element.FreeVirtualMemory/element.TotalVirtualMemorySize )
          WScript.Echo( "Threshold %: " & THRESHOLD )

          If( CDbl( 100*element.FreeVirtualMemory/element.TotalVirtualMemorySize ) >= CDbl( THRESHOLD )) Then
            WScript.Echo( "Threshold not exceeded" )
            WScript.Quit( PASS )
          Else
            WScript.Echo( "THRESHOLD EXCEEDED" )
            WScript.Quit( THRESHOLD_EXCEEDED )
          End If
   Next

The script works on my Windows 2003 server with 2.5GB of virtual memory (1GB Physical + 1.5GB Page File = 2.5GB)

\>cscript virtual_memcheck.vbs localhost 10
Microsoft (R) Windows Script Host Version 5.6
Copyright (C) Microsoft Corporation 1996-2001. All rights reserved.

Free Virtual Memory Size in KBytes: 2149824
Total Virtual Memory Size in KBytes: 2532904
Virtual Memory Free %: 84.8758579085508
Threshold %: 10
Threshold not exceeded

\>cscript virtual_memcheck.vbs localhost 90
Microsoft (R) Windows Script Host Version 5.6
Copyright (C) Microsoft Corporation 1996-2001. All rights reserved.

Free Virtual Memory Size in KBytes: 2125196
Total Virtual Memory Size in KBytes: 2532904
Virtual Memory Free %: 83.9035352307075
Threshold %: 90
THRESHOLD EXCEEDED

But on my Windows XP desktop it does not work (3.5GB Physical + 7GB Page File = 10GB) (Note that 3.5GB is the amount of memory available to Windows, the other 512MB has been taken by the video adapter).

C:\>cscript virtual_memcheck.vbs localhost 10
Microsoft (R) Windows Script Host Version 5.6
Copyright (C) Microsoft Corporation 1996-2001. All rights reserved.

Free Virtual Memory Size in KBytes: 2055592
Total Virtual Memory Size in KBytes: 2097024
Virtual Memory Free %: 98.0242476957822
Threshold %: 10
Threshold not exceeded

Note the total virtual memory is really 10GB not the 2GB reported by WMI. The free VM should be at least 8GB.

I don't think that the numbers from WMI are accurate enough to use in monitoring.