Page 1 of 1
7.0.5 Memory leak
Posted: 09.09.2013, 22:09
by Alfa000
Hello
If i try this simple project, then memory manager generate memory leak mesage:
Code: Select all
program LeakProj;
{$APPTYPE CONSOLE}
{$R *.res}
uses
System.SysUtils, ZDbcIntfs, ZDbcMySql;
var
sConString: string;
LZeos: IZConnection;
begin
ReportMemoryLeaksOnShutdown := True;
sConString := Format('zdbc:%s://%s:%d/%s?UID=%s;PWD=%s', ['mysql-5', '127.0.0.1', 4434, 'aslibex_dunit_zeos', 'root', '']);
LZeos := DriverManager.GetConnection(sConString);
LZeos := nil;
end.
I don't know why, but i try break code in finalization part of unit ZDbcMySql
Code: Select all
initialization
MySQLDriver := TZMySQLDriver.Create;
DriverManager.RegisterDriver(MySQLDriver);
finalization
if DriverManager <> nil then
DriverManager.DeregisterDriver(MySQLDriver);
MySQLDriver := nil; //<< In this place MySQLDriver ref count have value 2!
end. //<< In this place MySQLDriver ref count have still value 1! MySQLDriver is never destroyed!
Maybe problem is here: I tried insert breakpoint to method TZAbstractDriver.Destroy but this method was never executed!
Re: 7.0.5 Memory leak
Posted: 10.09.2013, 11:13
by EgonHugeist
I'm not 100% sure yet. But ReportMemoryLeakOnShutDown is an annoying theme:
It doesn't check MemLeaks which are freed after finalization. The IZDriverManager is already alive which contains a clone of the Driver. That's why RefCount > 0.
We're using the FPC HeapTrace-Unit for detecting leaket memory, which btw. tell's us much more about leaked memory than the ReportMemoryLeakOnShutDown of Delphi. I'm planning to add FASTMM4 to our test units...
What makes me wondering: Does the destructore really never be called?
Re: 7.0.5 Memory leak
Posted: 10.09.2013, 15:01
by Alfa000
Ok, i try FastMM4 with full debug mode on this really simple program. This program does allmost nothing. But memory leak is still reported.
Code: Select all
program LeakProj;
{$APPTYPE CONSOLE}
{$R *.res}
uses
FastMM4, //FullDebugMode enabled
System.SysUtils, ZDbcIntfs, ZDbcMySql;
var
sConString: string;
LZeos: IZConnection;
begin
sConString := Format('zdbc:%s://%s:%d/%s?UID=%s;PWD=%s', ['mysql-5', '127.0.0.1', 4434, 'aslibex_dunit_zeos', 'root', '']);
LZeos := DriverManager.GetConnection(sConString);
LZeos := nil;
end.
MadExcept and EurekaLog still reports memory leak too. I attach reports files from FastMM and MadExcept.
Main point is, that no memory leaks occurs in previous stable version of ZeosLib - 7.0.4.
In this simple program i place four breakpoint into these constructors and destructors:
TZAbstractDriver.Create
TZAbstractDriver.Destroy
TZAbstractConnection.Create
TZAbstractConnection.Destroy
If i use zeoslib 7.0.4 then program stops once in every of these methods.
But if i use zeoslib 7.0.5 then program stops only in constructors.
Sorry for my poor English.
Daniel Andrascik
Re: 7.0.5 Memory leak
Posted: 10.09.2013, 15:19
by EgonHugeist
Have to correct my selves.
Found the bug and did solve this issue.
Patch done R2722 \testing 7.1
Hmpf annoying after releasing 7.0.5, realy. Switch to SVN..
Re: 7.0.5 Memory leak
Posted: 10.09.2013, 16:46
by Alfa000
Re: 7.0.5 Memory leak
Posted: 02.10.2013, 19:02
by fhaut
hi
using the zeos 7.0.5a-stable still remain the memory leak...
Re: 7.0.5 Memory leak
Posted: 02.10.2013, 19:23
by EgonHugeist
Where did you get 7.0.5a from? SVN?
Re: 7.0.5 Memory leak
Posted: 03.10.2013, 12:40
by fhaut
yes
from SVN at svn://svn.code.sf.net/p/zeoslib/code-0/tags/7.0.5a-stable
Re: 7.0.5 Memory leak
Posted: 04.10.2013, 20:33
by fhaut
EgonHugeist
you have found the SVN repository ? or there is a other repository address where the memleak is solved ?
fhaut wrote:yes
from SVN at svn://svn.code.sf.net/p/zeoslib/code-0/tags/7.0.5a-stable
Re: 7.0.5 Memory leak
Posted: 08.10.2013, 22:51
by EgonHugeist
Re: 7.0.5 Memory leak
Posted: 09.10.2013, 12:43
by fhaut
Works fine,
Thank you
Now still remains: