1. Home

Product groups

Support

Memory Utilization - WeOnlyDo Discussion board

Memory Utilization (wodSFTP / wodSFTP.NET / wodSFTPdll)

by rien van ham, Monday, June 02, 2008, 16:04 (5816 days ago)

Dear all,

I'm developing a kind of 'message-broker' application which logs in on different FTP-servers for more than 1000 times a day. I'm using the wodFtpDLX-component for this. I'm experiencing a very big problem with the application: after the start it uses about 30MB of memory, in a few hours it is increased to about 200MB.
With the debugger I found that the memory is increased every time I call the LISTDIR method (which calls a POPULATETREE(item als DirItems) method).
Even with the following code in POPULATETREE the used memory is increased:
For i = 0 To Items.Count - 1
If Items(i).Type = typeFile Then
'do nothing
end if
Next

The component is shipped with an example-project (c:\Program Files\WeOnlyDo.Com\FtpDLXSamples\VB\Component\2. Folder Tree). On this application I added a timer which presses the connect and disconnect buttons every second. With the taskmanager in sight you can see the memory-usage growing.

Please, what can I do with this problem?

Thank you,
regards,
Rien van Ham

locked
  2221 views

Re: Memory Utilization

by woddrazen, Monday, June 02, 2008, 18:04 (5816 days ago) @ rien van ham

Hi Rien,


I have just finished testing and didn't find any significant memory leak with 2. Folder Tree sample.

When I remove:

TreeView1.Nodes.Add AtNode.Key, tvwChild, _ & MyKey, a

line from my code I find some memory leak but I think this has to be something wilt TreeView object (buffering) because when I change line to this:

TreeView1.Nodes.Add AtNode.Key, tvwChild, _ & MyKey,

then I don't have memory leak.

I have also tried same routing on new sample without TreeView and didn't find any memory leak. In my tests I start ListDir Method in loop every 20 seconds for about 30 minutes.

In order to duplicate your issue we will need more info. Which server you are using? Which protocol? Passive or non passive mode if you are using FTP protocol. How many files, folders is in folder you are listing?

Hope I helped.


Regards,
Drazen

locked
  2221 views

Re: Memory Utilization

by rien van ham, Tuesday, June 03, 2008, 13:05 (5815 days ago) @ woddrazen

Hi Drazen,

I did some extensive testing with my application and found the following:

I'm using the LISTDIR method.

It fires the DONE event which calls the PopulateTree method:
Private Sub objFTPOphalenNieuw_Done(ByVal ErrorCode As Long,
ByVal ErrorText As String)
PopulateTree objFTPOphalenNieuw.DirItems
End Sub

IF PopulateTree contains NO code:
Private Sub PopulateTree(ByVal Items As DirItems)
End Sub

NO memoryleak is present in the application.

But, if a put the following code in this method:
Private Sub PopulateTree(ByVal Items As DirItems)
Dim intTeller as Integer

For intTeller = 0 To Items.Count - 1
Next intTeller
End Sub

the application starts leaking memory:
at start it uses: 12.224 MB
after 1 min.: 14.552 MB
after 2 min.: 15.128 MB
after 3 min.: 15.648 MB
after 4 min.: 16.184 MB
etc.

==========================================================
Used FTP-server (on localhost): Serv-U 6.4.0.6
Files present in sourcedirectory: 429, 7 MB

The only thing my testapplication does at this moment is logging in at the server and getting the filelist.

Thanks a lot,

Rien van Ham

locked
  2282 views

Re: Memory Utilization

by woddrazen, Tuesday, June 03, 2008, 13:35 (5815 days ago) @ rien van ham

Rien,


Is there any chance that you can zip and send your sample to: techsupport@weonlydo.com ?

I'm unable in duplicating your issue. Also tell us how many files (number) you have in that folder.


Drazen

locked
  2195 views

Re: Memory Utilization

by rien van ham, Tuesday, June 03, 2008, 13:57 (5815 days ago) @ woddrazen

Hello Drazen,

The code was sent to you by email.

Oh yes, the number of file on the ftp-server: 429 (about 7 MB).

Thanks,
Rien.

locked
  2231 views

Re: Memory Utilization

by rien van ham, Wednesday, June 04, 2008, 15:16 (5814 days ago) @ rien van ham

My problem is solved!!

Compliments for you all guys that you solved the problem in such a short time! Thank you very, very much.

Regards,
Rien

locked
  2223 views

May I say how nice it is to work with components so complete and self-explanatory that using them in my application is as instinctive as though I wrote them myself?

Michael Barnett
Full Spectrum Telecommunications

Your professionalism is reflected into your email, your product and your web site. I am confident that these will make the difference.

Sylvain Paquette
R&D Analyst at InfoPharm Inc.

It is very refreshing to find such helpful, knowledgeable and quick responding technical support.

Jason Sears
CompuSource Systems, Inc.

Your professionalism is reflected into your email, your product and your web site. I am confident that these will make the difference.

Sylvain Paquette
R&D Analyst at InfoPharm Inc.

This has been, by far, the best experience I have ever had dealing with a support entity in my long career in the technical arena

Frank Kloskowski
GlobalCare Inc.

Count us as a satisfied WeOnlyDo customer. We appreciate your terrific support to get the secure Telnet working properly.

Don Fitzpatrick
InterNetworx Systems

I can only hope I will have the pleasure to work with other products by "We Only Do" in the future.

Tomer Spivak
Verint Systems Ltd

It was no small factor, however, that your support in getting me up and running made me buy from you.

Charles Taylor
InterWeave, Inc.

We have recently completed a large 1200+ location project where reliable Telnet and SSH connectivity was required. wodSSH worked flawlessly and allowed our staff to complete our project ontime and within budget.

James Sievers
Harbor Technologies

...I'm extremely impressed with the product, it represents excellent value for money...

Danny Haworth
Assetdisk