Codejock Developer Community : CRITICAL memoryleak using Databind http://forum.codejock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Thu, 16 Apr 2026 08:07:46 +0000 Sat, 16 Oct 2010 03:00:14 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 forum.codejock.com/RSS_post_feed.asp?TID=17314 <![CDATA[Codejock Developer Community]]> http://forum.codejock.com/forum_images/codejock-logo.gif http://forum.codejock.com/ <![CDATA[CRITICAL memoryleak using Databind : adrien wrote: We found...]]> http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60943&title=critical-memoryleak-using-databind#60943 Author: Aaron
Subject: 17314
Posted: 16 October 2010 at 3:00am

Originally posted by adrien adrien wrote:

 
[...]
We found this by writing our own memory tracker, which thunks calls to VirtualAlloc and VirtualFree so we could track (and get stack of allocation) leaks.  

[...]
 
 
Hi,
 
Would you be so kind and share your "memory tracker application" ?
 
If not, check this @CapoPezzio: http://www.codeproject.com/KB/threads/ProSysLib3.aspx
and maybe usefull to CodeJock also Wink 
 
To support: Why don't you reply on this post? C'mon, if this is a bug just say so !!! and if you are convinced that it isn't and "we" are doing something wrong, just say so.
 
Thanks
 
 
 
]]> Sat, 16 Oct 2010 03:00:14 +0000 http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60943&title=critical-memoryleak-using-databind#60943 <![CDATA[CRITICAL memoryleak using Databind : There&#039;s a memory leak in...]]> http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60891&title=critical-memoryleak-using-databind#60891 Author: adrien
Subject: 17314
Posted: 14 October 2010 at 9:11am

There's a memory leak in MSJet40.dll if you update a field in a record of type SQL_LONGVARCHAR.

We found this by writing our own memory tracker, which thunks calls to VirtualAlloc and VirtualFree so we could track (and get stack of allocation) leaks.  

Are you perchance accessing an MDB file for your database?
]]> Thu, 14 Oct 2010 09:11:14 +0000 http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60891&title=critical-memoryleak-using-databind#60891 <![CDATA[CRITICAL memoryleak using Databind : Hi,I still have got no answer....]]> http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60884&title=critical-memoryleak-using-databind#60884 Author: CapoPezzio
Subject: 17314
Posted: 14 October 2010 at 2:36am

Hi,
I still have got no answer. Maybe because I only bought a 30 day subscription back in April this year, they dont answer me, I dont know. But the problem is there to see
]]> Thu, 14 Oct 2010 02:36:03 +0000 http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60884&title=critical-memoryleak-using-databind#60884 <![CDATA[CRITICAL memoryleak using Databind : Hi, Still no answer? I tried...]]> http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60786&title=critical-memoryleak-using-databind#60786 Author: Aaron
Subject: 17314
Posted: 10 October 2010 at 10:44am

Hi,

Still no answer? I tried with sample from CodeJock site http://www.codejock.com/downloads/samples/reportcontrol.asp and seems same thing. Sometimes memory isn't released (still using TaskManager) adding a few times 20.000 records (batch and usual) and after remove all, still few Mb missing. After exiting app these Mb's are released.
 
To support: Can someone explain to us poor VB users how to monitor this properly and why memory isn't released even with Customheap and BatchAllocation? I would be very happy if someone could explain it to us.  
 
Thanks
     
 
]]> Sun, 10 Oct 2010 10:44:38 +0000 http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60786&title=critical-memoryleak-using-databind#60786 <![CDATA[CRITICAL memoryleak using Databind : Thank you for your reply Aaron....]]> http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60489&title=critical-memoryleak-using-databind#60489 Author: CapoPezzio
Subject: 17314
Posted: 27 September 2010 at 4:51am

Thank you for your reply Aaron. I have tried with the functions you mentioned, but it didnt help. uploads/6039/reportcontrol_memoryleak-1.zip . Here is a small example if you want to take a look. This demonstrate my problem. If you know a better way to monitor memory leak than to use the Task Manager, please let  me know.

Found this link where it says: The simplest way to find a memory leak is with the Windows Task Manager. Run the application and monitor Memory Usage and Virtual Memory Size in the Process tab or use the Windows Resource kit. A continuous increase in virtual memory, after the application has allocated all the memory it needs, indicates a memory leak. If it’s a very small and subtle memory leak, it would take some hours to identify, but its well worth the effort.

http://www.drdobbs.com/184416404

I have posted to Support today and waiting for an answer
]]> Mon, 27 Sep 2010 04:51:17 +0000 http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60489&title=critical-memoryleak-using-databind#60489 <![CDATA[CRITICAL memoryleak using Databind : Hi, And maybe CJ isn&#039;t...]]> http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60465&title=critical-memoryleak-using-databind#60465 Author: Aaron
Subject: 17314
Posted: 25 September 2010 at 5:05am

Hi,
 
And maybe CJ isn't responsable for this... Maybe checkout Helpfile for methods:
 
FreeBatchExtraData
UseBatchAllocation
UseReportCustomHeap
 
I copy/paste the description from helpfile for UseReportCustomHeap in here so you are able to read what I mean. I don't know if it applies to "Databinding feature" as well, better ask support Wink
 

Description

Tells the report control to create its own memory heap instead of letting MFC allocate memory (In standard mode, not virtual).

Syntax

Public Function UseReportCustomHeap() As Boolean

Return Type

Returns True if the report control to creates its own memory heap to store report resources.

Remarks

Typically it should be fine to allow MFC to allocate memory, but in some cases if you are working with really large data set that you are removing and loading on a regular basis memory is not released and UseReportCustomHeap should be used.  UseReportCustomHeap tells the report control to create its own memory heap instead of letting MFC allocate memory.  This is only really needed when adding and removing large numbers of rows over and over again.  The problem is that MFC will allocate memory for the rows created, but it must create a whole page in memory and this page may also have memory for some other processes in windows, not just the report control.  So when it comes time to delete the rows the report related memory is marked for deletion, but the page can not be removed as there are other windows processes using it.  This is how MFC works and is not a bug.  This is why after deleting large amounts of records the memory does not appear to get released.  To overcome this short comming of MFC you can use UseReportCustomHeap for the report control to create its own memory heap so that it can release all memory related to the rows in the remove when they are removed.

Read red marked text, that's why I said CJ can't do anything about that. Maybe better to write to Bill Gates, I guess he is responsable Wink There's a sample what uses above methods, try it and check if memory usage increases same way.
 
 
]]> Sat, 25 Sep 2010 05:05:11 +0000 http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60465&title=critical-memoryleak-using-databind#60465 <![CDATA[CRITICAL memoryleak using Databind : Then I will be very interesting...]]> http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60454&title=critical-memoryleak-using-databind#60454 Author: CapoPezzio
Subject: 17314
Posted: 24 September 2010 at 11:59am

Then I will be very interesting to learn how you monitor memory usage of an application. Refer to my application with reportcontrol and databind, I fill the controll with >100000 records, 20 columns each time. The memory usage goes up with abount 40 MB each time, and I soon reach 1 GB in task manager. Sorry, I just cant sit back, dont think my customeres will either, and say -Everything is ok.

]]> Fri, 24 Sep 2010 11:59:13 +0000 http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60454&title=critical-memoryleak-using-databind#60454 <![CDATA[CRITICAL memoryleak using Databind : Again, the task managers &#034;memory...]]> http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60451&title=critical-memoryleak-using-databind#60451 Author: ABuenger
Subject: 17314
Posted: 24 September 2010 at 10:26am

Again, the task managers "memory usage" doesn't say anything about real memory usage, it shows the process working set.

For example msdev.exe shows 13 MB memory usage. If I minimize the window it drops to 3 MB.

]]> Fri, 24 Sep 2010 10:26:01 +0000 http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60451&title=critical-memoryleak-using-databind#60451 <![CDATA[CRITICAL memoryleak using Databind : We are two person in our company...]]> http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60448&title=critical-memoryleak-using-databind#60448 Author: CapoPezzio
Subject: 17314
Posted: 24 September 2010 at 9:45am

We are two person in our company who runs the example on two different computeres and both experience the same. It is the same in our business application, we use the same prosedure to set up the ReportControl. With larger datasets the leak is larger. Wich version are you using?]]> Fri, 24 Sep 2010 09:45:25 +0000 http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60448&title=critical-memoryleak-using-databind#60448 <![CDATA[CRITICAL memoryleak using Databind : The memory usage in the task manager...]]> http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60447&title=critical-memoryleak-using-databind#60447 Author: ABuenger
Subject: 17314
Posted: 24 September 2010 at 9:30am

The memory usage in the task manager doesn't say anything about memory leaks. Also I've just tested the sample and there is no memory leak.


]]> Fri, 24 Sep 2010 09:30:08 +0000 http://forum.codejock.com/forum_posts.asp?TID=17314&PID=60447&title=critical-memoryleak-using-databind#60447