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Process.WorkingSet64 Property

Definition

Gets the amount of physical memory, in bytes, allocated for the associated process.

public:
 property long WorkingSet64 { long get(); };
public long WorkingSet64 { get; }
[System.Runtime.InteropServices.ComVisible(false)]
public long WorkingSet64 { get; }
member this.WorkingSet64 : int64
[<System.Runtime.InteropServices.ComVisible(false)>]
member this.WorkingSet64 : int64
Public ReadOnly Property WorkingSet64 As Long

Property Value

The amount of physical memory, in bytes, allocated for the associated process.

Attributes

Examples

The following code example starts an instance of the Notepad application. The example then retrieves and displays various properties of the associated process. The example detects when the process exits, and displays its exit code and peak memory statistics.

#using <system.dll>

using namespace System;
using namespace System::Diagnostics;
int main()
{
   
   // Define variables to track the peak
   // memory usage of the process.
   _int64 peakPagedMem = 0,peakWorkingSet = 0,peakVirtualMem = 0;
   Process^ myProcess = nullptr;
   try
   {
      
      // Start the process.
      myProcess = Process::Start( "NotePad.exe" );
      
      // Display the process statistics until
      // the user closes the program.
      do
      {
         if (  !myProcess->HasExited )
         {
            
            // Refresh the current process property values.
            myProcess->Refresh();
            Console::WriteLine();
            
            // Display current process statistics.
            Console::WriteLine( "{0} -", myProcess );
            Console::WriteLine( "-------------------------------------" );
            Console::WriteLine( "  physical memory usage: {0}", myProcess->WorkingSet64 );
            Console::WriteLine( "  base priority: {0}", myProcess->BasePriority );
            Console::WriteLine( "  priority class: {0}", myProcess->PriorityClass );
            Console::WriteLine( "  user processor time: {0}", myProcess->UserProcessorTime );
            Console::WriteLine( "  privileged processor time: {0}", myProcess->PrivilegedProcessorTime );
            Console::WriteLine( "  total processor time: {0}", myProcess->TotalProcessorTime );
            Console::WriteLine("  PagedSystemMemorySize64: {0}", myProcess->PagedSystemMemorySize64);
            Console::WriteLine("  PagedMemorySize64: {0}", myProcess->PagedMemorySize64);
            
            // Update the values for the overall peak memory statistics.
            peakPagedMem = myProcess->PeakPagedMemorySize64;
            peakVirtualMem = myProcess->PeakVirtualMemorySize64;
            peakWorkingSet = myProcess->PeakWorkingSet64;
            if ( myProcess->Responding )
            {
               Console::WriteLine( "Status = Running" );
            }
            else
            {
               Console::WriteLine( "Status = Not Responding" );
            }
         }
      }
      while (  !myProcess->WaitForExit( 1000 ) );
      Console::WriteLine();
      Console::WriteLine( "Process exit code: {0}", myProcess->ExitCode );
      
      // Display peak memory statistics for the process.
      Console::WriteLine( "Peak physical memory usage of the process: {0}", peakWorkingSet );
      Console::WriteLine( "Peak paged memory usage of the process: {0}", peakPagedMem );
      Console::WriteLine( "Peak virtual memory usage of the process: {0}", peakVirtualMem );
   }
   finally
   {
      if ( myProcess != nullptr )
      {
         myProcess->Close();
      }
   }

}
using System;
using System.Diagnostics;

namespace ProcessSample
{
    class ProcessMonitorSample
    {
        public static void Main()
        {
            // Define variables to track the peak
            // memory usage of the process.
            long peakPagedMem   = 0,
                 peakWorkingSet = 0,
                 peakVirtualMem = 0;

            // Start the process.
            using (Process myProcess = Process.Start("NotePad.exe"))
            {
                // Display the process statistics until
                // the user closes the program.
                do
                {
                    if (!myProcess.HasExited)
                    {
                        // Refresh the current process property values.
                        myProcess.Refresh();

                        Console.WriteLine();

                        // Display current process statistics.

                        Console.WriteLine($"{myProcess} -");
                        Console.WriteLine("-------------------------------------");

                        Console.WriteLine($"  Physical memory usage     : {myProcess.WorkingSet64}");
                        Console.WriteLine($"  Base priority             : {myProcess.BasePriority}");
                        Console.WriteLine($"  Priority class            : {myProcess.PriorityClass}");
                        Console.WriteLine($"  User processor time       : {myProcess.UserProcessorTime}");
                        Console.WriteLine($"  Privileged processor time : {myProcess.PrivilegedProcessorTime}");
                        Console.WriteLine($"  Total processor time      : {myProcess.TotalProcessorTime}");
                        Console.WriteLine($"  Paged system memory size  : {myProcess.PagedSystemMemorySize64}");
                        Console.WriteLine($"  Paged memory size         : {myProcess.PagedMemorySize64}");

                        // Update the values for the overall peak memory statistics.
                        peakPagedMem   = myProcess.PeakPagedMemorySize64;
                        peakVirtualMem = myProcess.PeakVirtualMemorySize64;
                        peakWorkingSet = myProcess.PeakWorkingSet64;

                        if (myProcess.Responding)
                        {
                            Console.WriteLine("Status = Running");
                        }
                        else
                        {
                            Console.WriteLine("Status = Not Responding");
                        }
                    }
                }
                while (!myProcess.WaitForExit(1000));

                Console.WriteLine();
                Console.WriteLine($"  Process exit code          : {myProcess.ExitCode}");

                // Display peak memory statistics for the process.
                Console.WriteLine($"  Peak physical memory usage : {peakWorkingSet}");
                Console.WriteLine($"  Peak paged memory usage    : {peakPagedMem}");
                Console.WriteLine($"  Peak virtual memory usage  : {peakVirtualMem}");
            }
        }
    }
}
open System.Diagnostics

// Define variables to track the peak
// memory usage of the process.
let mutable peakPagedMem = 0L
let mutable peakWorkingSet = 0L
let mutable peakVirtualMem = 0L

// Start the process.
use myProcess = Process.Start "NotePad.exe"

// Display the process statistics until
// the user closes the program.
while myProcess.WaitForExit 1000 |> not do
    if not myProcess.HasExited then
        // Refresh the current process property values.
        myProcess.Refresh()

        printfn ""

        // Display current process statistics.

        printfn $"{myProcess} -"
        printfn "-------------------------------------"

        printfn $"  Physical memory usage     : {myProcess.WorkingSet64}"
        printfn $"  Base priority             : {myProcess.BasePriority}"
        printfn $"  Priority class            : {myProcess.PriorityClass}"
        printfn $"  User processor time       : {myProcess.UserProcessorTime}"
        printfn $"  Privileged processor time : {myProcess.PrivilegedProcessorTime}"
        printfn $"  Total processor time      : {myProcess.TotalProcessorTime}"
        printfn $"  Paged system memory size  : {myProcess.PagedSystemMemorySize64}"
        printfn $"  Paged memory size         : {myProcess.PagedMemorySize64}"

        // Update the values for the overall peak memory statistics.
        peakPagedMem <- myProcess.PeakPagedMemorySize64
        peakVirtualMem <- myProcess.PeakVirtualMemorySize64
        peakWorkingSet <- myProcess.PeakWorkingSet64

        if myProcess.Responding then
            printfn "Status = Running"
        else
            printfn "Status = Not Responding"

printfn ""
printfn $"  Process exit code          : {myProcess.ExitCode}"

// Display peak memory statistics for the process.
printfn $"  Peak physical memory usage : {peakWorkingSet}"
printfn $"  Peak paged memory usage    : {peakPagedMem}"
printfn $"  Peak virtual memory usage  : {peakVirtualMem}"
Imports System.Diagnostics

Namespace ProcessSample
    Class ProcessMonitorSample

        Public Shared Sub Main()

            ' Define variables to track the peak
            ' memory usage of the process.
            Dim peakPagedMem As Long = 0
            Dim peakWorkingSet As Long = 0
            Dim peakVirtualMem As Long = 0

            ' Start the process.
            Using myProcess = Process.Start("NotePad.exe")

                ' Display process statistics until
                ' the user closes the program.
                Do

                    If Not myProcess.HasExited Then

                        ' Refresh the current process property values.
                        myProcess.Refresh()

                        Console.WriteLine()

                        ' Display current process statistics.

                        Console.WriteLine($"{myProcess} -")
                        Console.WriteLine("-------------------------------------")

                        Console.WriteLine($"  Physical memory usage     : {myProcess.WorkingSet64}")
                        Console.WriteLine($"  Base priority             : {myProcess.BasePriority}")
                        Console.WriteLine($"  Priority class            : {myProcess.PriorityClass}")
                        Console.WriteLine($"  User processor time       : {myProcess.UserProcessorTime}")
                        Console.WriteLine($"  Privileged processor time : {myProcess.PrivilegedProcessorTime}")
                        Console.WriteLine($"  Total processor time      : {myProcess.TotalProcessorTime}")
                        Console.WriteLine($"  Paged system memory size  : {myProcess.PagedSystemMemorySize64}")
                        Console.WriteLine($"  Paged memory size         : {myProcess.PagedMemorySize64}")

                        ' Update the values for the overall peak memory statistics.
                        peakPagedMem = myProcess.PeakPagedMemorySize64
                        peakVirtualMem = myProcess.PeakVirtualMemorySize64
                        peakWorkingSet = myProcess.PeakWorkingSet64

                        If myProcess.Responding Then
                            Console.WriteLine("Status = Running")
                        Else
                            Console.WriteLine("Status = Not Responding")
                        End If
                    End If
                Loop While Not myProcess.WaitForExit(1000)

                Console.WriteLine()
                Console.WriteLine($"  Process exit code                         : {myProcess.ExitCode}")

                ' Display peak memory statistics for the process.
                Console.WriteLine($"  Peak physical memory usage of the process : {peakWorkingSet}")
                Console.WriteLine($"  Peak paged memory usage of the process    : {peakPagedMem}")
                Console.WriteLine($"  Peak virtual memory usage of the process  : {peakVirtualMem}")
            End Using
        End Sub
    End Class
End Namespace

Remarks

The value returned by this property represents the most recently refreshed size of working set memory used by the process, in bytes. To get the most up to date size, you need to call Refresh() method first.

The working set of a process is the set of memory pages currently visible to the process in physical RAM memory. These pages are resident and available for an application to use without triggering a page fault.

The working set includes both shared and private data. The shared data includes the pages that contain all the instructions that the process executes, including instructions in the process modules and the system libraries.

This property can be used to monitor memory usage on computers with 32-bit processors or 64-bit processors. The property value is equivalent to the Working Set performance counter for the process.

Applies to

See also