[Swig-devel] [ swig-Bugs-1501284 ] OUPUT typemap --> python memory leak

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Bugs item #1501284, was opened at 2006-06-05 15:27
Message generated for change (Comment added) made by szager
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Category: python
Group: None
>Status: Closed
>Resolution: Wont Fix
Priority: 5
Private: No
Submitted By: S Joshua Swamidass (sswamida)
Assigned to: Marcelo Matus (marcelomatus)
Summary: OUPUT typemap --> python memory leak

Initial Comment:

using the output typemap with Swig 1.3.24, Python 2.4 
on Linux causes a memory leak.

For example, consider a swig declaration:

void func(double *OUTPUT, double *OUTPUT);

for the following C function:

void func(double *out1,double *out2) {
   *out1=1324;
   *out2=24;
}

This function ca be used as expected:

>>> from swigmodule import func
>>> func()
(1324.0, 24.0)


However it produces a memory leak revealed by watching 
memory usage with repeated iteration:

>>> while True:
...    func()

-----> rapidly increased memory usage.


Please advise.



----------------------------------------------------------------------

>Comment By: szager (szager)
Date: 2011-04-25 15:55

Message:
I believe this is a characteristic of python, not SWIG.  When I run this
code:

for i in range(10000000):
    i + 1

... I get the essentially the same memory profile as with your example.


----------------------------------------------------------------------

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