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I know how to get the System memory use using GlobalMemoryStatusEx, but that tells me the what the entire OS is using.

I really want my program to report how much memory it alone has allocated and is using.

Is there any way within my Delphi 2009 program to call either a Windows function or maybe some FastMM function to find out the memory that has been allocated by my program alone?

Revisiting my question, I have now changed my accepted answer to the GetMemoryManagerState answer by @apenwarr. It produced identical results to the GetHeapStatus function (now deprecated) that I used to use, whereas GetProcessMemoryInfo.WorkingSetSize gave a very different result.

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6 Answers 6

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86

You can get useful memory usage information out of the Delphi runtime without using any direct Win32 calls:

unit X; uses FastMM4; //include this or method will return 0. .... function GetMemoryUsed: UInt64; var st: TMemoryManagerState; sb: TSmallBlockTypeState; begin GetMemoryManagerState(st); result := st.TotalAllocatedMediumBlockSize + st.TotalAllocatedLargeBlockSize; for sb in st.SmallBlockTypeStates do begin result := result + sb.UseableBlockSize * sb.AllocatedBlockCount; end; end;

The best thing about this method is that it's strictly tracked: when you allocate memory, it goes up, and when you deallocate memory, it goes down by the same amount right away. I use this before and after running each of my unit tests, so I can tell which test is leaking memory (for example).

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13 Comments

This method is valid when using FastMM4 or delphi 2006+, but if you are not using FastMM4, you should consider start using it!
This may be the best and most useful answer I've ever seen on StackOverflow. I wish I could upvote it 100 times.
besides the above, this method shows the amount of memory allocated by the application, not the amount of memory used by it (like memory allocated by 3rd party dlls, ocx/COM, etc) For that, a much more reliable solution is the one given by Jim McKeeth below, provided that MemCounters.PagefileUsage is also added to the result.
Small remark: You have to use (=set it in a uses section) FastMM4 in the unit that you are implementing this. It's not enough to just add FastMM4 in the project unit.
@rvheddeg Incredibly important "small remark". It will just return 0 if you don't do this. It saved my day, thank you.
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From an old blog post of mine.

Want to know how much memory your program is using? This Delphi function will do the trick.

uses Winapi.Windows, System.SysUtils, PsAPI; {...} function CurrentProcessMemory: NativeUInt; var MemCounters: TProcessMemoryCountersEx; CallSuccess: Boolean; begin MemCounters.cb := SizeOf(MemCounters); CallSuccess := GetProcessMemoryInfo( GetCurrentProcess, @MemCounters, SizeOf(MemCounters)); if CallSuccess then Result := MemCounters.WorkingSetSize else begin Result := 0; RaiseLastOSError; end; end;

Not sure where I got the basics of this, but I added some better error handling to it and made it a function. WorkingSetSize is the amount of memory currently used. You can use similar code to get other values for the current process (or any process). You will need to include psAPI in your uses statement.

The PROCESS_MEMORY_COUNTERS_EX record includes:

  • PageFaultCount
  • PeakWorkingSetSize
  • WorkingSetSize
  • QuotaPeakPagedPoolUsage
  • QuotaPagedPoolUsage
  • QuotaPeakNonPagedPoolUsage
  • QuotaNonPagedPoolUsage
  • PagefileUsage
  • PeakPagefileUsage
  • PrivateUsage

Check out the MSDN docs on the GetProcessMemoryInfo function for more information.

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3 Comments

The output number of this function is constantly growing and shows already 7000064 bytes RAM used, but task manager shows that the process is using 1972 kb of RAM. By the way, the link to your blog is dead.
Shouldn't the function result be NativeUInt instead of Cardinal so you get a 64-bit result when compiled to a 64-bit app?
That was probably 32 bit code, but for 64 bit you would want NativeUInt
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You can look at an example on how to use FastMM with the UsageTrackerDemo project that comes included with the Demos when you download the complete FastMM4 bundle from SourceForge.

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4

I wrote this small function to return the current process (app) memory usage:

function ProcessMemory: longint; var pmc: PPROCESS_MEMORY_COUNTERS; cb: Integer; begin // Get the used memory for the current process cb := SizeOf(TProcessMemoryCounters); GetMem(pmc, cb); pmc^.cb := cb; if GetProcessMemoryInfo(GetCurrentProcess(), pmc, cb) then Result:= Longint(pmc^.WorkingSetSize); FreeMem(pmc); end;
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3 Comments

Why use GetMem? Just declare a TProcessmemoryCounters variable right there instead of using a dynamic one.
This is the answer, with Rob's optimization.
It depends on what you think memory usage is. This code gives you the woking set size and is what task manager calls memory usage. But it is by far not the amount of memory a process is using. It is the part that currently is in RAM instead of the page file.
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Conversion of Gant C ++ code, to console application in Delphi:

 program MemoryProcessCMD; {* Based in Gant(https://stackoverflow.com/users/12460/gant) code*} {$APPTYPE CONSOLE} {$R *.res} uses System.SysUtils, psapi, Windows; procedure PrintMemoryInfo(processID: DWORD); var hProcess: THandle; pmc: PROCESS_MEMORY_COUNTERS; total: DWORD; begin // Print the process identifier. Writeln(format('Process ID: %d', [processID])); // Print information about the memory usage of the process. hProcess := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, FALSE, processID); if (hProcess = 0) then begin exit; end; if (GetProcessMemoryInfo(hProcess, @pmc, SizeOf(pmc))) then begin Writeln(format(#09'PageFaultCount: 0x%.8X', [pmc.PageFaultCount])); Writeln(format(#09'PeakWorkingSetSize: 0x%.8X', [pmc.PeakWorkingSetSize])); Writeln(format(#09'WorkingSetSize: 0x%.8X', [pmc.WorkingSetSize])); Writeln(format(#09'QuotaPeakPagedPoolUsage: 0x%.8X', [pmc.QuotaPeakPagedPoolUsage])); Writeln(format(#09'QuotaPagedPoolUsage: 0x%.8X', [pmc.QuotaPagedPoolUsage])); Writeln(format(#09'QuotaPeakNonPagedPoolUsage: 0x%.8X', [pmc.QuotaPeakNonPagedPoolUsage])); Writeln(format(#09'QuotaNonPagedPoolUsage: 0x%.8X', [pmc.QuotaNonPagedPoolUsage])); Writeln(format(#09'PagefileUsage: 0x%.8X', [pmc.PagefileUsage])); Writeln(format(#09'PeakPagefileUsage: 0x%.8X', [pmc.PeakPagefileUsage])); Writeln(format(#09'PagefileUsage: 0x%.8X', [pmc.PagefileUsage])); end; CloseHandle(hProcess); end; var aProcesses: array [0 .. 1024] of DWORD; cbNeeded, cProcesses: DWORD; i: Integer; begin try // Get the list of process identifiers. if (not EnumProcesses(@aProcesses, SizeOf(aProcesses), &cbNeeded)) then halt(1); // Calculate how many process identifiers were returned. cProcesses := cbNeeded div SizeOf(DWORD); // Print the memory usage for each process for i := 0 to cProcesses - 1 do begin PrintMemoryInfo(aProcesses[i]); end; except on E: Exception do Writeln(E.ClassName, ': ', E.Message); end; end.
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For Win32 API way, you need GetProcessMemoryInfo function. Here is an example from MSDN page but the code is in C++. I think you can convert it to Delphi as well. What you are looking is probably called "Working Set Size."

#include <windows.h> #include <stdio.h> #include <psapi.h> void PrintMemoryInfo( DWORD processID ) { HANDLE hProcess; PROCESS_MEMORY_COUNTERS pmc; // Print the process identifier. printf( "\nProcess ID: %u\n", processID ); // Print information about the memory usage of the process. hProcess = OpenProcess( PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, processID ); if (NULL == hProcess) return; if ( GetProcessMemoryInfo( hProcess, &pmc, sizeof(pmc)) ) { printf( "\tPageFaultCount: 0x%08X\n", pmc.PageFaultCount ); printf( "\tPeakWorkingSetSize: 0x%08X\n", pmc.PeakWorkingSetSize ); printf( "\tWorkingSetSize: 0x%08X\n", pmc.WorkingSetSize ); printf( "\tQuotaPeakPagedPoolUsage: 0x%08X\n", pmc.QuotaPeakPagedPoolUsage ); printf( "\tQuotaPagedPoolUsage: 0x%08X\n", pmc.QuotaPagedPoolUsage ); printf( "\tQuotaPeakNonPagedPoolUsage: 0x%08X\n", pmc.QuotaPeakNonPagedPoolUsage ); printf( "\tQuotaNonPagedPoolUsage: 0x%08X\n", pmc.QuotaNonPagedPoolUsage ); printf( "\tPagefileUsage: 0x%08X\n", pmc.PagefileUsage ); printf( "\tPeakPagefileUsage: 0x%08X\n", pmc.PeakPagefileUsage ); } CloseHandle( hProcess ); } int main( ) { // Get the list of process identifiers. DWORD aProcesses[1024], cbNeeded, cProcesses; unsigned int i; if ( !EnumProcesses( aProcesses, sizeof(aProcesses), &cbNeeded ) ) return 1; // Calculate how many process identifiers were returned. cProcesses = cbNeeded / sizeof(DWORD); // Print the memory usage for each process for ( i = 0; i < cProcesses; i++ ) PrintMemoryInfo( aProcesses[i] ); return 0; }
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Thanks for starting it off. Right answer but wrong language and too complicated.

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