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Monitor Memory Usage of my own Process

Posted on 2004-04-30
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Last Modified: 2010-05-20
How do I Monitor Memory Usage of my own Process?

I'm interested in things like Virtual Memory (Current & Peak) and Working Set Size (Current & Peak).  All the sort of things that TaskManager shows.  Only just for my own process.
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Question by:PHenningsen
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LVL 26

Expert Comment

by:Russell Libby
Comment Utility

Here are some functions that should give you what you are after:

// Get minimum working set size
function GetMinWorkingSetSize: DWORD;
var  dwTemp:        DWORD;
begin

  if not(GetProcessWorkingSetSize(GetCurrentProcess, result, dwTemp)) then result:=0;

end;

// Get maximum working set size
function GetMaxWorkingSetSize: DWORD;
var  dwTemp:        DWORD;
begin

  if not(GetProcessWorkingSetSize(GetCurrentProcess, dwTemp, result)) then result:=0;

end;

// Get number of bytes allocated for delphi's heap manager
function GetCurrentSetSize: DWORD;
var  lpHeapStatus:  THeapStatus;
begin

  lpHeapStatus:=GetHeapStatus;
  result:=lpHeapStatus.TotalAddrSpace;

end;

procedure TForm1.Button1Click(Sender: TObject);
begin

  ShowMessage(IntToStr(GetMinWorkingSetSize));
  ShowMessage(IntToStr(GetMaxWorkingSetSize));
  ShowMessage(IntToStr(GetCurrentSetSize));

end;


Regards,
Russell
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LVL 26

Expert Comment

by:Russell Libby
Comment Utility
Also, you may want to look into the GetHeapStatus function (used in the GetCurrentSize function). This returns a structure detailing current memory usage for the delphi process.

type

  THeapStatus = record
    TotalAddrSpace: Cardinal;s
    TotalUncommitted: Cardinal;
    TotalCommitted: Cardinal;
    TotalAllocated: Cardinal;
    TotalFree: Cardinal;
    FreeSmall: Cardinal;
    FreeBig: Cardinal;
    Unused: Cardinal;
    Overhead: Cardinal;
    HeapErrorCode: Cardinal;

  end;

Also, there is AllocMemCount/AllocMemSize that can return the number of allocated memory blocks, and the size of the allocated memory blocks (respectively)

Russell
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Author Comment

by:PHenningsen
Comment Utility
As I understand it, Min & Max Working Set Size are "desired" limits.  I'd like to find Current & Peak Working Set Size.  I believe that it is these two values that Task Manager calls "Mem Usage"

I'll have to experiment with the numbers from THeapStatus.  Delphi's help info did not clarify it.

AllocMemSize does not measure Current Working Set Size
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LVL 26

Expert Comment

by:Russell Libby
Comment Utility

My misunderstanding on what you were after....

Check GetProcessMemoryInfo which is available from the psapi.pas unit. The GetProcessMemoryInfo function will return the following information in a record structure.

typedef struct _PROCESS_MEMORY_COUNTERS {
    DWORD cb;
    DWORD PageFaultCount;
    SIZE_T PeakWorkingSetSize;
    SIZE_T WorkingSetSize;
    SIZE_T QuotaPeakPagedPoolUsage;
    SIZE_T QuotaPagedPoolUsage;
    SIZE_T QuotaPeakNonPagedPoolUsage;
    SIZE_T QuotaNonPagedPoolUsage;
    SIZE_T PagefileUsage;
    SIZE_T PeakPagefileUsage;
} PROCESS_MEMORY_COUNTERS;

This will return the peak and current working set size for the process. If you need an example of usage, just ask.

Regards,
Russell


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Author Comment

by:PHenningsen
Comment Utility
I would love an example.  Thanks
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LVL 26

Accepted Solution

by:
Russell Libby earned 500 total points
Comment Utility
No problem....
Same display info as what is shown in the Task manager (Mem Usage, peak Mem Usage), except displayed in the form caption

Russell

------------------
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls, Psapi;

type
  TForm1         = class(TForm)
     procedure   FormCreate(Sender: TObject);
     procedure   FormClose(Sender: TObject; var Action: TCloseAction);
  private
     // Private declarations
     FTimer:     TTimer;
  protected
     // Protected declarations
     procedure   OnTimer(Sender: TObject);
  public
     // Public declarations
  end;

var
  Form1: TForm1;

implementation
{$R *.DFM}

procedure TForm1.OnTimer(Sender: TObject);
var  psmemCounters: _PROCESS_MEMORY_COUNTERS;
begin

  psmemCounters.cb:=SizeOf(_PROCESS_MEMORY_COUNTERS);
  if GetProcessMemoryInfo(GetCurrentProcess, @psmemCounters, SizeOf(_PROCESS_MEMORY_COUNTERS)) then
  begin
     // Display in KB
     Caption:=Format('PeakWorkingSetSize = %d KB, WorkingSetSize = %d KB',
                     [psmemCounters.PeakWorkingSetSize div 1024,
                     psmemCounters.WorkingSetSize div 1024]);
  end;

end;

procedure TForm1.FormCreate(Sender: TObject);
begin

  FTimer:=TTimer.Create(Self);
  FTimer.Interval:=1000;
  FTimer.OnTimer:=Self.OnTimer;

end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin

  FTimer.Free;

end;

end.


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Author Comment

by:PHenningsen
Comment Utility
Thank you so much!

My EE-display has changed like to "inquiry only" and I can't find the "Accept" button.

I'll try harder in a few minutes...
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