[Swig-devel] [ swig-Bugs-3385089 ] builtin seems to leak memory

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Bugs item #3385089, was opened at 2011-08-02 15:03
Message generated for change (Comment added) made by lavid
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Category: python
Group: None
Status: Pending
Resolution: Fixed
Priority: 5
Private: No
Submitted By: David Lichterman (lavid)
Assigned to: szager (szager)
Summary: builtin seems to leak memory

Initial Comment:
swig version: trunk
python version: Python 2.7.1+
gcc: (Ubuntu/Linaro 4.5.2-8ubuntu4) 4.5.2

I recently attempted creating a SWIG python wrapper using the following flags: "-python", "-builtin", "-fastdispatch", "-modern", "-c++"
The resulting object seems to be faster, but it also seems to leak memory.

when I run this code:
import Tuple
while True:
    Tuple.Tuple()

and monitor the python interpreter in top, i see that memory is constantly being allocated for new objects, but never freed. i've also checked that this isn't a case of lazy GC, and i've run:
import gc
gc.collect()

and then re-run the above to find that memory isn't being freed.

when i create my wrapper without the -builtin flag, the python interpreter seems to be able to GC the SWIG objects just fine.

thanks for making the -builtin feature! it seems quite a great deal faster, i hope i can provide any needed information to allow this bug to be fixed.

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Comment By: David Lichterman (lavid)
Date: 2011-09-06 09:46

Message:
thank you so much!

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Comment By: szager (szager)
Date: 2011-08-22 16:34

Message:
Thanks for reporting this; you are correct about the memory leak.

I have committed a fix as revision 12782; it will go in the next SWIG
release.

Stefan

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Comment By: szager (szager)
Date: 2011-08-22 16:34

Message:
I've committed a fix to CVS.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=101645&aid=3385089&group_id=1645