Delphi/DBExpress 的内存泄漏
我的应用程序有一个奇怪的问题,它的内存使用量时不时地增加几百兆字节,最终应用程序冻结。该应用程序是用Delphi编写的,它使用数据库、COM(用于OPC)和TCP/IP。
使用 FastMM,我可以看到内存使用情况的屏幕截图。我不完全确定如何读取该表,但看起来有些东西已经分配了 296463552 字节(0x100fb000,是“幻数”吗?) 3 次。
有什么想法吗?有没有办法跟踪非 Delphi-MM 内存分配?
我正在使用 Delphi 2007 和 FastMM 4.96。
编辑:
我使用 IMallocSpy 编写了一个小帮助程序类来跟踪 COM 内存分配。以下是我得到的摘录:
00119023 5:52:27.484 [4496] TCOMAllocSpy.PreRealloc size: 269462304
00119024 5:52:27.734 [4496] (0002760C){ntdll.dll } [7C82860C] KiFastSystemCallRet + $0
00119025 5:52:27.734 [4496] (0009F83A){MyApp.exe} [004A083A] JclDebug.JclCreateThreadStackTrace (Line 3943, "JclDebug.pas" + 7) + $1E
00119026 5:52:27.734 [4496] (003D496A){MyApp.exe} [007D596A] ComLeakHelper.TCOMAllocSpy.DebugStack (Line 46, "ComLeakHelper.pas" + 2) + $9
00119027 5:52:27.734 [4496] (003D4B52){MyApp.exe} [007D5B52] ComLeakHelper.TCOMAllocSpy.PreRealloc (Line 125, "ComLeakHelper.pas" + 4) + $2
00119028 5:52:27.734 [4496] (000053B6){MyApp.exe} [004063B6] System.@WStrAsg (Line 14090, "sys\system.pas" + 10) + $0
00119029 5:52:27.734 [4496] (002E4490){MyApp.exe} [006E5490] DBXCommon.TDBXCommand.SetText (Line 5304, "..\..\..\..\..\src\pas\dbx\driver\DBXCommon.pas" + 13) + $5
00119030 5:52:27.734 [4496] (0010A340){MyApp.exe} [0050B340] WideStrings.TWideStrings.GetValue (Line 580, "common\WideStrings.pas" + 3) + $D
00119031 5:52:27.734 [4496] (002E1AFC){MyApp.exe} [006E2AFC] DBXCommon.TDBXProperties.GetValue (Line 4046, "..\..\..\..\..\src\pas\dbx\driver\DBXCommon.pas" + 1) + $7
00119032 5:52:27.734 [4496] (002E3FC9){MyApp.exe} [006E4FC9] DBXCommon.TDBXConnectionEx.GetProductName (Line 5071, "..\..\..\..\..\src\pas\dbx\driver\DBXCommon.pas" + 1) + $E
00119033 5:52:27.734 [4496] (003765FA){MyApp.exe} [007775FA] SqlExpr.TSQLConnection.DoConnect (Line 2467, "..\..\..\..\..\src\pas\dbx\vcl\SqlExpr.pas" + 66) + $21
00119034 5:52:27.734 [4496] (0011876D){MyApp.exe} [0051976D] DB.TCustomConnection.SetConnected (Line 2628, "DB.pas" + 8) + $4
00119035 5:52:27.734 [4496] (00118728){MyApp.exe} [00519728] DB.TCustomConnection.Open (Line 2611, "DB.pas" + 0) + $4
00119036 5:52:27.734 [4496] (00375D6F){MyApp.exe} [00776D6F] SqlExpr.TSQLConnection.CheckConnection (Line 2302, "..\..\..\..\..\src\pas\dbx\vcl\SqlExpr.pas" + 4) + $2
00119037 5:52:27.734 [4496] (00379241){MyApp.exe} [0077A241] SqlExpr.TCustomSQLDataSet.CheckConnection (Line 3955, "..\..\..\..\..\src\pas\dbx\vcl\SqlExpr.pas" + 2) + $2
00119038 5:52:27.734 [4496] (0037968A){MyApp.exe} [0077A68A] SqlExpr.TCustomSQLDataSet.OpenCursor (Line 4045, "..\..\..\..\..\src\pas\dbx\vcl\SqlExpr.pas" + 3) + $4
00119039 5:52:27.734 [4496] (00125EA9){MyApp.exe} [00526EA9] DB.TDataSet.SetActive (Line 9245, "DB.pas" + 12) + $7
00119040 5:52:27.734 [4496] (00125CA1){MyApp.exe} [00526CA1] DB.TDataSet.Open (Line 9201, "DB.pas" + 1) + $6
...
所以,问题似乎出在数据库连接上。我正在使用来自 Upscene 的 Firebird 2.1、DBExpress 和 InterXpress for Firebird 驱动程序。
编辑2: 这似乎分析了类似的问题,至少重点与此处相同: http://www.yac.com.pl/mt.texts.sqlexpr-2.en.html
I've a weird problem with my application, its memory usage goes up a few hundred megabytes at once every now and then and eventually the application freezes. The application is written with Delphi, it uses database, COM (for OPC) and TCP/IP.
With FastMM I've got following the screen shot of memory usage. I'm not completely sure how to read that table, but it looks like something has allocated 296463552 bytes (0x100fb000, is that "magic number"?) three times.
Any ideas? Is there any way to track non-Delphi-MM memory allocations?
I'm using Delphi 2007 with FastMM 4.96.
Edit:
I wrote a small helper class using IMallocSpy to track COM memory allocations. Here's excerpt from what I got:
00119023 5:52:27.484 [4496] TCOMAllocSpy.PreRealloc size: 269462304
00119024 5:52:27.734 [4496] (0002760C){ntdll.dll } [7C82860C] KiFastSystemCallRet + $0
00119025 5:52:27.734 [4496] (0009F83A){MyApp.exe} [004A083A] JclDebug.JclCreateThreadStackTrace (Line 3943, "JclDebug.pas" + 7) + $1E
00119026 5:52:27.734 [4496] (003D496A){MyApp.exe} [007D596A] ComLeakHelper.TCOMAllocSpy.DebugStack (Line 46, "ComLeakHelper.pas" + 2) + $9
00119027 5:52:27.734 [4496] (003D4B52){MyApp.exe} [007D5B52] ComLeakHelper.TCOMAllocSpy.PreRealloc (Line 125, "ComLeakHelper.pas" + 4) + $2
00119028 5:52:27.734 [4496] (000053B6){MyApp.exe} [004063B6] System.@WStrAsg (Line 14090, "sys\system.pas" + 10) + $0
00119029 5:52:27.734 [4496] (002E4490){MyApp.exe} [006E5490] DBXCommon.TDBXCommand.SetText (Line 5304, "..\..\..\..\..\src\pas\dbx\driver\DBXCommon.pas" + 13) + $5
00119030 5:52:27.734 [4496] (0010A340){MyApp.exe} [0050B340] WideStrings.TWideStrings.GetValue (Line 580, "common\WideStrings.pas" + 3) + $D
00119031 5:52:27.734 [4496] (002E1AFC){MyApp.exe} [006E2AFC] DBXCommon.TDBXProperties.GetValue (Line 4046, "..\..\..\..\..\src\pas\dbx\driver\DBXCommon.pas" + 1) + $7
00119032 5:52:27.734 [4496] (002E3FC9){MyApp.exe} [006E4FC9] DBXCommon.TDBXConnectionEx.GetProductName (Line 5071, "..\..\..\..\..\src\pas\dbx\driver\DBXCommon.pas" + 1) + $E
00119033 5:52:27.734 [4496] (003765FA){MyApp.exe} [007775FA] SqlExpr.TSQLConnection.DoConnect (Line 2467, "..\..\..\..\..\src\pas\dbx\vcl\SqlExpr.pas" + 66) + $21
00119034 5:52:27.734 [4496] (0011876D){MyApp.exe} [0051976D] DB.TCustomConnection.SetConnected (Line 2628, "DB.pas" + 8) + $4
00119035 5:52:27.734 [4496] (00118728){MyApp.exe} [00519728] DB.TCustomConnection.Open (Line 2611, "DB.pas" + 0) + $4
00119036 5:52:27.734 [4496] (00375D6F){MyApp.exe} [00776D6F] SqlExpr.TSQLConnection.CheckConnection (Line 2302, "..\..\..\..\..\src\pas\dbx\vcl\SqlExpr.pas" + 4) + $2
00119037 5:52:27.734 [4496] (00379241){MyApp.exe} [0077A241] SqlExpr.TCustomSQLDataSet.CheckConnection (Line 3955, "..\..\..\..\..\src\pas\dbx\vcl\SqlExpr.pas" + 2) + $2
00119038 5:52:27.734 [4496] (0037968A){MyApp.exe} [0077A68A] SqlExpr.TCustomSQLDataSet.OpenCursor (Line 4045, "..\..\..\..\..\src\pas\dbx\vcl\SqlExpr.pas" + 3) + $4
00119039 5:52:27.734 [4496] (00125EA9){MyApp.exe} [00526EA9] DB.TDataSet.SetActive (Line 9245, "DB.pas" + 12) + $7
00119040 5:52:27.734 [4496] (00125CA1){MyApp.exe} [00526CA1] DB.TDataSet.Open (Line 9201, "DB.pas" + 1) + $6
...
So, the problem seems to be in database connection. I'm using Firebird 2.1, DBExpress and InterXpress for Firebird drivers from Upscene.
Edit2:
This seems to analyze similar problem, at least the focus is on same lines as here: http://www.yac.com.pl/mt.texts.sqlexpr-2.en.html
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问题是 Delphi 2007 DbExpress 中的错误,它在多线程环境中出现(毕竟它不是线程安全的)。更多信息请参见:http://www.yac.com.pl /mt.texts.sqlexpr-2.en.html
The problem is bug in Delphi 2007 DbExpress which surface in multithreaded environment (It's not thread safe, after all). More information here: http://www.yac.com.pl/mt.texts.sqlexpr-2.en.html
当您的应用程序被冻结时,您可以尝试查看堆栈以找出它被冻结的原因:
http://code.google.com/p/asmprofiler/wiki/ProcessStackViewer
您可以尝试 memproof 来跟踪所有资源分配(及其堆栈跟踪):
http://www.torry.net/tools/debug/memory/memp0948.zip
When your application is frozen, your can try to look at the stack to discover why it is frozen:
http://code.google.com/p/asmprofiler/wiki/ProcessStackViewer
You can try memproof to trace all resource allocation (and their stacktrace):
http://www.torry.net/tools/debug/memory/memp0948.zip
尝试EurekaLog来定位问题。
Try EurekaLog to locate the problem.