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VDS 6 Memory Leak

 
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Garrett
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Joined: 04 Oct 2001
Posts: 2146
Location: A House

PostPosted: Fri Apr 17, 2009 2:38 am    Post subject: VDS 6 Memory Leak Reply with quote

Seems there's a memory leak in VDS 6. Not sure if it's limited to only using a timer loop, or in general, but I only found out while using a timer loop.

Here's a simple example to use and test to see if VDS 6 suffers from a memory leak on your system.

Compile it, run it, open Windows Task Manager, hit the Processes tab and look for your exe. Then just sit and watch for a few minutes. See if the memory continues to increase.

Code:
  OPTION SLEEPTIME,20

  DIALOG CREATE,New Dialog,-1,0,320,240
  DIALOG ADD,STYLE,STYLE1,,14,BC,,BLACK
  DIALOG ADD,STYLE,STYLE2,,12,,,BLACK
  DIALOG ADD,SHAPE,SHAPE1,0,0,320,240,WHITE,BLACK,,RECTANGLE
  DIALOG ADD,TEXT,TEXT1,20,0,320,24,VDS 6 Memory Leak Test,,STYLE1
  DIALOG ADD,TEXT,TEXT2,60,20,280,100,Compile this example and then run it.  Open Windows Task Manager and select the processes tab and seek out this program and watch the memory.,,STYLE2
  DIALOG ADD,BUTTON,BUTTON1,205,245,64,24,Exit
  DIALOG SHOW

:EVENTLOOP
  WAIT EVENT,"0.0"
  GOTO @event()

:BUTTON1BUTTON
:CLOSE
  EXIT

:TIMER
  GOTO EVENTLOOP

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Garrett
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Joined: 04 Oct 2001
Posts: 2146
Location: A House

PostPosted: Fri Apr 17, 2009 2:47 am    Post subject: Reply with quote

Further checking it out, I find that the culprit is the timer event. Using "WAIT EVENT,<time here>" and any amount of time below 1 causes a leak.

Now if you were to use the following code without the timer in the WAIT EVENT, you get no leak at all.

Code:
  OPTION SLEEPTIME,20

  DIALOG CREATE,New Dialog,-1,0,320,240
  DIALOG ADD,STYLE,STYLE1,,14,BC,,BLACK
  DIALOG ADD,STYLE,STYLE2,,12,,,BLACK
  DIALOG ADD,SHAPE,SHAPE1,0,0,320,240,WHITE,BLACK,,RECTANGLE
  DIALOG ADD,TEXT,TEXT1,20,0,320,24,VDS 6 Memory Leak Test,,STYLE1
  DIALOG ADD,TEXT,TEXT2,60,20,280,100,Compile this example and then run it.  Open Windows Task Manager and select the processes tab and seek out this program and watch the memory.,,STYLE2
  DIALOG ADD,BUTTON,BUTTON1,205,245,64,24,Exit
  DIALOG SHOW

:EVENTLOOP
  WAIT "0.0"
  %E = @event()
  IF %E
    GOTO %E
  END
  GOTO EVENTLOOP

:BUTTON1BUTTON
:CLOSE
  EXIT

_________________
'What you do not want done to yourself, do not do to others.' - Confucius (550 b.c. to 479 b.c.)
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Dave
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Joined: 03 Sep 2005
Posts: 403
Location: Australia

PostPosted: Sat Apr 18, 2009 7:46 am    Post subject: Reply with quote

It seems like a very slow memory leak, but at around 2K per second that's 172800K per day. But as soon as you minimise, or minimise and restore, the window the memory usage drops a lot. If you minimised and then restored the window every 30 minutes the memory usage would never excede the original amount used when the application was first started.

Using 'wait event, 0.0'
When first started it uses 5000K.
After about 10 seconds it starts to leak at about 2K per second.
If you Minimise it, it drops to between 620 and 720K.
If you then Restore it, it jumps up to about 1500K.
Note: It continues to leak during all of the above.

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cheers

Dave


Last edited by Dave on Sun Apr 19, 2009 5:51 am; edited 1 time in total
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Garrett
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Joined: 04 Oct 2001
Posts: 2146
Location: A House

PostPosted: Sat Apr 18, 2009 9:52 am    Post subject: Reply with quote

That's odd, I didn't get any leak when I just used WAIT "0.1" or anything in that range, or WAIT 0, only when I used EVENT WAIT, "0.1" or anything below 1.
_________________
'What you do not want done to yourself, do not do to others.' - Confucius (550 b.c. to 479 b.c.)
Necroprogramming FTW! - "Wait.. Is necroprogramming legal?"
http://www.freewarehome.com <-- Freeware listings since 1996
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Dave
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Joined: 03 Sep 2005
Posts: 403
Location: Australia

PostPosted: Sun Apr 19, 2009 5:50 am    Post subject: Reply with quote

Sorry, I meant:

Using 'wait event, 0.0' (not Using 'wait, 0.0'). I've corrected my post above.

Further testing has revealed that adding any conditional statement within the eventloop prevents the memory leak.

Code:
:EVENTLOOP
  IF @EQUAL(%z,1)
  END
  WAIT EVENT,"0.0"
  GOTO @event()

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cheers

Dave
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Garrett
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Joined: 04 Oct 2001
Posts: 2146
Location: A House

PostPosted: Sun Apr 19, 2009 3:36 pm    Post subject: Reply with quote

Oh no you didn't just totally trash my workaround that I went and edited some of my source codes already cuz there was no other workaround at the time then you come along with a more simple solution to the solution I already came up with............ Razz

I'm a kidding of course Smile

Now I can go back to using the wait event again and just toss in a dud IF/END in there. Smile

Thanks for doing more testing and finding that out Dave Smile

_________________
'What you do not want done to yourself, do not do to others.' - Confucius (550 b.c. to 479 b.c.)
Necroprogramming FTW! - "Wait.. Is necroprogramming legal?"
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