[gecode-users] Memory Leak with NaryUnion/Region(?)

[Christian Schulte]

Hmm, thanks for the report. I might not fix that soon as the whole
implementation for Region might change.

Thanks a lot!
Christian

--
Christian Schulte, www.ict.kth.se/~cschulte/


-----Original Message-----
From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf
Of Jean-Noël Monette
Sent: Monday, March 26, 2012 1:53 PM
To: users at gecode.org
Subject: [gecode-users] Memory Leak with NaryUnion/Region(?)

Hello,

Sorry for bothering you again with the same class, namely NaryUnion... 
When running the next piece of code, within valgrind (memcheck), I get a
report for a memory leak...

#include "gecode/driver.hh"
#include "gecode/iter.hh"
using namespace Gecode;
class MySpace:public Space {
     public:
         virtual Space* copy(bool share){return this;} }; int main(int argc,
char* argv[]){
     MySpace home;
     Region region(home);
     for(int j=0;j<8;j++){
         Iter::Ranges::Empty e;
         Iter::Ranges::NaryUnion unio(region,e);
     }
}


The report is as follows:


==9213== HEAP SUMMARY:
==9213==     in use at exit: 40 bytes in 1 blocks
==9213==   total heap usage: 319 allocs, 318 frees, 94,497 bytes allocated
==9213==
==9213== 40 bytes in 1 blocks are definitely lost in loss record 1 of 1
==9213==    at 0x4C28FAC: malloc (vg_replace_malloc.c:236)
==9213==    by 0x6582629: Gecode::Region::heap_alloc(unsigned long) 
(heap.hpp:324)
==9213==    by 0x40474F: main (region.hpp:306)
==9213==
==9213== LEAK SUMMARY:
==9213==    definitely lost: 40 bytes in 1 blocks
==9213==    indirectly lost: 0 bytes in 0 blocks
==9213==      possibly lost: 0 bytes in 0 blocks
==9213==    still reachable: 0 bytes in 0 blocks
==9213==         suppressed: 0 bytes in 0 blocks


The leak does not appear when looping only for 7 iterations instead of 8.
This seems quite normal as the memory is allocated on the heap only when the
region space is exhausted (according to MPG). I am using Gecode 3.7.1, gcc
4.5.2, Linux-Ubuntu 11.04 over a 64 bits architecture.  Is it some kind of
bug, or should I stop using NaryUnion once and for all?

Thank you again for your help,

Jean-Noël monette


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