Memory.vbs - Monitor memory usage on a Windows operating system
ActiveXperts Network Monitor ships with a powerful set of pre-defined checks. Each individual check has a static number of configuration items. To monitor other items, or to combine monitoring items, you can make use of custom VBScript checks.
Most of the built-in checks have a VBScript equivalent, implemented as a Function in a VBScript (.vbs) file. Out-of-the-box, each VBScript function monitors the same items as the built-in check. Feel free to modify a function. The VBScript check can be customized by editing the VBScript function.
To add a new VBScript-based Memory monitoring check, do the following:
- On the 'Monitor menu', click 'New Monitoring Check (VBScript)'. The 'VBScript Check' dialog box appears;
- In the 'File selection box', select 'Memory.vbs';
- In the 'Function selection box', select 'CheckMemory';
- In the 'Function parameters group box' enter the required parameters. You can also load a working sample first by clicking on the 'Load a sample, click here' link.
To customize the above monitoring check, click on the 'Edit button' next to the 'File selection box'. Notepad will be launched. You can now make changes to the VBScript function(s).
Memory.vbs script source code
' ///////////////////////////////////////////////////////////////////////////////
' // ActiveXperts Network Monitor - VBScript based checks
' // (c) ActiveXperts Software B.V.
' //
' // For more information about ActiveXperts Network Monitor and VBScript, please
' // visit the online ActiveXperts Network Monitor VBScript Guidelines at:
' // https://www.activexperts.com/support/network-monitor/online/vbscript/
' //
' ///////////////////////////////////////////////////////////////////////////////
'
Option Explicit
Const retvalUnknown = 1
Dim SYSDATA, SYSEXPLANATION ' Used by Network Monitor, don't change the names
' ///////////////////////////////////////////////////////////////////////////////' // To test a function outside Network Monitor (e.g. using CSCRIPT from the
' // command line), remove the comment character (') in the following 5 lines:
' Dim bResult
' bResult = CheckFreePhysicalMemory( "localhost", "", 100 )
' WScript.Echo "Return value: [" & bResult & "]"
' WScript.Echo "SYSDATA: [" & SYSDATA & "]"
' WScript.Echo "SYSEXPLANATION: [" & SYSEXPLANATION & "]"' ////////////////////////////////////////////////////////////////////////////////////////
' //////////////////////////////////////////////////////////////////////////////
Function CheckFreePhysicalMemory( strComputer, strCredentials, nMinMB )
' Description:
' Check free memory (MB) on the computer specified by strComputer
' Parameters:
' 1) strComputer As String - Hostname or IP address of the computer you want to check
' 2) strCredentials As String - Specify an empty string to use Network Monitor service credentials.
' To use alternate credentials, enter a server that is defined in Server Credentials table.
' (To define Server Credentials, choose Tools->Options->Server Credentials)
' 3) nMinMB As Number - Minimum required free memory (in MB)
' Usage:
' CheckFreePhysicalMemory( "<Hostname | IP>", "<Empty String | Server>", Min_MB )
' Sample:
' CheckFreePhysicalMemory( "localhost", "", 100 )
Dim objWMIService
CheckFreePhysicalMemory = retvalUnknown ' Default return value
SYSDATA = "" ' Initally empty; will contain the number of free MBs
SYSEXPLANATION = "" ' Set initial value
If( Not getWMIObject( strComputer, strCredentials, objWMIService, SYSEXPLANATION ) ) Then
Exit Function
End If
CheckFreePhysicalMemory = checkFreePhysicalMemoryWMI( objWMIService, strComputer, nMinMB, SYSDATA, SYSEXPLANATION )
End Function
' //////////////////////////////////////////////////////////////////////////////
Function CheckPagesPerSecond( strComputer, strCredentials, nMaxPages )
' Description:
' Check pages per second on the computer specified by strComputer
' Parameters:
' 1) strComputer As String - Hostname or IP address of the computer you want to check
' 2) strCredentials As String - Specify an empty string to use Network Monitor service credentials.
' To use alternate credentials, enter a server that is defined in Server Credentials table.
' (To define Server Credentials, choose Tools->Options->Server Credentials)
' 3) nMaxPages As Number - Maximum pages per second allowed
' Usage:
' CheckPagesPerSecond( "<Hostname | IP>", "<Empty String | Server>", Max_Pages )
' Sample:
' CheckPagesPerSecond( "localhost", "", 5 )
Dim objWMIService
CheckPagesPerSecond = retvalUnknown ' Default return value
SYSDATA = "" ' Initally empty; will contain the number of free MBs
SYSEXPLANATION = "" ' Set initial value
If( Not getWMIObject( strComputer, strCredentials, objWMIService, SYSEXPLANATION ) ) Then
Exit Function
End If
CheckPagesPerSecond = checkPagesPerSecondWMI( objWMIService, strComputer, nMaxPages, SYSDATA, SYSEXPLANATION )
End Function
' //////////////////////////////////////////////////////////////////////////////
Function CheckCommittedMemory( strComputer, strCredentials, nMaxCommittedMB )
' Description:
' Check free memory (MB) on the computer specified by strComputer
' Parameters:
' 1) strComputer As String - Hostname or IP address of the computer you want to check
' 2) strCredentials As String - Specify an empty string to use Network Monitor service credentials.
' To use alternate credentials, enter a server that is defined in Server Credentials table.
' (To define Server Credentials, choose Tools->Options->Server Credentials)
' 3) nMaxCommittedMB As Number - Maximum allowed committed memory (in MB)
' Usage:
' CheckCommittedMemory( "<Hostname | IP>", "<Empty String | Server>", Max_MB )
' Sample:
' CheckCommittedMemory( "localhost", "", 800 )
Dim objWMIService
CheckCommittedMemory = retvalUnknown ' Default return value
SYSDATA = "" ' Initally empty; will contain the number of free MBs
SYSEXPLANATION = "" ' Set initial value
If( Not getWMIObject( strComputer, strCredentials, objWMIService, SYSEXPLANATION ) ) Then
Exit Function
End If
CheckCommittedMemory = checkCommittedMemoryWMI( objWMIService, strComputer, nMaxCommittedMB, SYSDATA, SYSEXPLANATION )
End Function
' //////////////////////////////////////////////////////////////////////////////
' //
' // Private Functions
' // NOTE: Private functions are used by the above functions, and will not
' // be called directly by the ActiveXperts Network Monitor Service.
' // Private function names start with a lower case character and will
' // not be listed in the Network Monitor's function browser.
' //
' //////////////////////////////////////////////////////////////////////////////
Function checkFreePhysicalMemoryWMI( objWMIService, strComputer, nMinMB, BYREF strSysData, BYREF strSysExplanation )
Dim colItems, objOS, nFreeMemMB, nDiffMB
checkFreePhysicalMemoryWMI = retvalUnknown ' Default return value
On Error Resume Next
Set colItems = objWMIService.ExecQuery("Select * from Win32_OperatingSystem")
If( Err.Number <> 0 ) Then
strSysData = ""
strSysExplanation = "Unable to query WMI on computer [" & strComputer & "]"
Exit Function
End If
If( colItems.Count <= 0 ) Then
strSysData = ""
strSysExplanation = "Win32_OperatingSystem class does not exist on computer [" & strComputer & "]"
Exit Function
End If
On Error Goto 0
For Each objOS In colItems
If( Err.Number <> 0 ) Then
checkFreePhysicalMemoryWMI = retvalUnknown
strSysData = ""
strSysExplanation = "Unable to queue memory information."
Exit Function
End If
nFreeMemMB = FormatNumber( objOS.FreePhysicalMemory / 1024, 0, 0, 0, 0 )
strSysData = nFreeMemMB
strSysExplanation = "Free physical memory=[" & nFreeMemMB & " MB], minimum required=[" & nMinMB & " MB]"
nDiffMB = nFreeMemMB - nMinMB
If( nDiffMB > 0 ) Then
checkFreePhysicalMemoryWMI = True
Exit Function
Else
checkFreePhysicalMemoryWMI = False
Exit Function
End If
Next
checkFreePhysicalMemoryWMI = retvalUnknown
strSysExplanation = "Unable to find WMI memory class on computer [" & strComputer & "]"
End Function
' //////////////////////////////////////////////////////////////////////////////
Function checkPagesPerSecondWMI( objWMIService, strComputer, nMaxPages, BYREF strSysData, BYREF strSysExplanation )
Dim colItems, i, nPages, nDiffPages
checkPagesPerSecondWMI = retvalUnknown ' Default return value
On Error Resume Next
Set colItems = objWMIService.ExecQuery("Select * from Win32_PerfFormattedData_PerfOS_Memory" )
If( Err.Number <> 0 ) Then
strSysData = ""
strSysExplanation = "Unable to query WMI on computer [" & strComputer & "]"
Exit Function
End If
If( colItems.Count <= 0 ) Then
strSysData = ""
strSysExplanation = "Win32_PerfFormattedData_PerfOS_Memory class does not exist on computer [" & strComputer & "]"
Exit Function
End If
On Error Goto 0
For Each i In colItems: Exit For: Next 'Hack to recover object from collection.
If( Err.Number <> 0 ) Then
checkPagesPerSecondWMI = retvalUnknown
strSysData = ""
strSysExplanation = "Unable to queue memory information."
Exit Function
End If
nPages = i.PagesPerSec
strSysData = nPages
strSysExplanation = "Pages per second=[" & nPages & "], maximum allowed=[" & nMaxPages & "]"
nDiffPages = nMaxPages - nPages
If( nDiffPages > 0 ) Then
checkPagesPerSecondWMI = True
Exit Function
Else
checkPagesPerSecondWMI = False
Exit Function
End If
End Function
' //////////////////////////////////////////////////////////////////////////////
Function checkCommittedMemoryWMI( objWMIService, strComputer, nMaxMB, BYREF strSysData, BYREF strSysExplanation )
Dim colItems, i, nCommittedMB, nDiffMB
checkCommittedMemoryWMI = retvalUnknown ' Default return value
On Error Resume Next
Set colItems = objWMIService.ExecQuery("Select * from Win32_PerfFormattedData_PerfOS_Memory" )
If( Err.Number <> 0 ) Then
strSysData = ""
strSysExplanation = "Unable to query WMI on computer [" & strComputer & "]"
Exit Function
End If
If( colItems.Count <= 0 ) Then
strSysData = ""
strSysExplanation = "Win32_PerfFormattedData_PerfOS_Memory class does not exist on computer [" & strComputer & "]"
Exit Function
End If
On Error Goto 0
For Each i In colItems: Exit For: Next 'Hack to recover object from collection.
If( Err.Number <> 0 ) Then
checkCommittedMemoryWMI = retvalUnknown
strSysData = ""
strSysExplanation = "Unable to queue memory information."
Exit Function
End If
nCommittedMB = FormatNumber( i.CommittedBytes / ( 1024 * 1024 ), 0, 0, 0, 0 )
strSysData = nCommittedMB
strSysExplanation = "Committed memory=[" & nCommittedMB & " MB], maximum allowed=[" & nMaxMB & " MB]"
nDiffMB = nMaxMB - nCommittedMB
If( nDiffMB > 0 ) Then
checkCommittedMemoryWMI = True
Exit Function
Else
checkCommittedMemoryWMI = False
Exit Function
End If
End Function
' //////////////////////////////////////////////////////////////////////////////
Function getWMIObject( strComputer, strCredentials, BYREF objWMIService, BYREF strSysExplanation )
On Error Resume Next
Dim objNMServerCredentials, objSWbemLocator, colItems
Dim strUsername, strPassword
getWMIObject = False
Set objWMIService = Nothing
If( strCredentials = "" ) Then
' Connect to remote host on same domain using same security context
Set objWMIService = GetObject( "winmgmts:{impersonationLevel=Impersonate}!\\" & strComputer &"\root\cimv2" )
Else
Set objNMServerCredentials = CreateObject( "ActiveXperts.NMServerCredentials" )
strUsername = objNMServerCredentials.GetLogin( strCredentials )
strPassword = objNMServerCredentials.GetPassword( strCredentials )
If( strUsername = "" ) Then
getWMIObject = False
strSysExplanation = "No alternate credentials defined for [" & strCredentials & "]. In the Manager application, select 'Options' from the 'Tools' menu and select the 'Server Credentials' tab to enter alternate credentials"
Exit Function
End If
' Connect to remote host using different security context and/or different domain
Set objSWbemLocator = CreateObject( "WbemScripting.SWbemLocator" )
Set objWMIService = objSWbemLocator.ConnectServer( strComputer, "root\cimv2", strUsername, strPassword )
If( Err.Number <> 0 ) Then
objWMIService = Nothing
getWMIObject = False
strSysExplanation = "Unable to access [" & strComputer & "]. Possible reasons: WMI not running on the remote server, Windows firewall is blocking WMI calls, insufficient rights, or remote server down"
Exit Function
End If
objWMIService.Security_.ImpersonationLevel = 3
End If
If( Err.Number <> 0 ) Then
objWMIService = Nothing
getWMIObject = False
strSysExplanation = "Unable to access '" & strComputer & "'. Possible reasons: no WMI installed on the remote server, no rights to access remote WMI service, or remote server down"
Exit Function
End If
getWMIObject = True
End Function