BMX 1.33: LoadImage / Loadiconstrip memory leak

Archives Forums/BlitzMax Bug Reports/BMX 1.33: LoadImage / Loadiconstrip memory leak

Grisu

(Posted 2009) [#1]

Hello!

The following example will give you a constant rise in memory usage until it finally crashes after wasting 2 GB.

The leak occurs if you use "Loadimage" or "Loadiconstrip".

' Bmx 1.33 - Memory leak example by Grisu
' --------------------------------------------
' Please watch the Task Manager's memory usage!

Framework brl.Max2D
'  Import brl.Bmploader
'  Import brl.Pngloader
  Import brl.Jpgloader

SuperStrict 

While True <> False ' Endless loop!

Local ButtoIco_exit:TImage=LoadImage("win7.jpg")  ' Just an ordinary image file

'If ButtoIco_exit<>Null Then Print "1" ' Debug line to check if images are really loaded.

Delay (1) ' free a little CPU time, not everyone has a Core i7 these days... ;)

Wend 
End ' of the digital world

* Only tested under Windows 7 (64 Bit) and Win XP(x86) so far.

Grisu

GfK	(Posted 2009) [#2]

Not sure exactly what the trouble is but there's something up with your Framework/Imports. Take that out, and it works fine.

Grisu

(Posted 2009) [#3]

Even if you take out the framework completely, the memory leak is still there.

Slower but still there. Just take a bigger image for testing and you should see it easier.

GfK	(Posted 2009) [#4]

Even if you take out the franework completely, the memory leak is still there.

Slower but still there. Just take a bigger image for testing and you should see it easier.

Well, I've had a play around with this using a 1024x1024 image. The memory usage goes up pretty quickly to about 400mb, but then it drops back down to hardly anything, then goes up again, drops down, etc etc.

If I build in threaded mode, GC never seems to clean up and the memory usage goes up and up.

So yep, deffo a pretty nasty bug.

[edit] Another odd thing - GCMemAlloced() seems to bear no correlation whatsoever to what Taskmanager says?

impixi

(Posted 2009) [#5]

Gfk:

Another odd thing - GCMemAlloced() seems to bear no correlation whatsoever to what Taskmanager says?

It doesn't. See here.

Otus	(Posted 2009) [#6]

In non-threaded mode the memory fluctuates between 20-100MB, but does not seem to be increasing. In threaded mode it fluctuates between 200-1000MB, but again does not seem to be leaking. Only watched for a couple of minutes, though.

Vista32, 3GB RAM