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How to: Get Total Physical Memory

Q: My app needs to know how much RAM the machine it's running on has. How can this information be aquired ?


Is there any _managed_ way of getting total physical memory installed in the machine ?


You can retrieve the amount of physical memory on the computer by using WMI (You could use a WMI query, the property is "TotalPhysicalMemory" which is in the "Win32_ComputerSystem" class.). However: WMI would almost always be the slowest way to retrieve system values using C#.


Therefore I advice to use Win32 API - GlobalMemoryStatus function included in kernel32.dll:


public struct MemoryStatus 
{ 
    public uint Length;  
    public uint MemoryLoad; 
    public uint TotalPhysical; 
    public uint AvailablePhysical; 
    public uint TotalPageFile; 
    public uint AvailablePageFile; 
    public uint TotalVirtual; 
    public uint AvailableVirtual; 
} 

[DllImport("kernel32.dll")] 
public static extern void GlobalMemoryStatus(out MemoryStatus stat);

From managed code we can use it like so:


MemoryStatus stat = new MemoryStatus();
GlobalMemoryStatus(out stat);
long ram = (long)stat.TotalPhysical;

Hope this helps.


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Saturday, June 14, 2008 5:59 AM

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