Delphi – How to get a stack trace from FastMM

delphidelphi-2009fastmm

I've noticed in the following post that you can get a stack trace out of FastMM to show what appears to be where an object was allocated:

How to track down tricky memory leak with fastMM?

I can't find any information on how to enable this in Delphi 2009, though.

I have set ReportMemoryLeaksOnShutdown to true so I get the basic report, but how do I get the stack trace report?

Best Answer

The internal Delphi version of FastMM doesn't support stack traces.

If you want to log the memory leak stack traces, you have to:

download the full version of the FastMM library

include it as the first unit in your project:

program YourProject;

uses
  FastMM4, // <--
  SysUtils,
  Forms,
  ...

enable the FullDebugMode option in FastMM4Options.inc
set Map file to Detailed in the linking project options (the FastMM_FullDebugMode.dll processes the .map file)
add the FastMM_FullDebugMode.dll in your binary (or Windows System32) directory

Related Solutions

Delphi – How to track down tricky memory leak with fastMM

This memory leak was being caused by a Delphi bug, QC #67709

It was fixed by the last Delphi 2009 update, no wonder I wasn't able to fix it.

Delphi – How to get the Memory Used by a Delphi Program

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).

Best Answer

Related Solutions

Delphi – How to track down tricky memory leak with fastMM

Delphi – How to get the Memory Used by a Delphi Program

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