[Octave-bug-tracker] [bug #38905] Memory Leak in openmpi_ext

[Sukanta Basu]

URL:
  <http://savannah.gnu.org/bugs/?38905>

                 Summary: Memory Leak in openmpi_ext
                 Project: GNU Octave
            Submitted by: basu0009
            Submitted on: Mon 06 May 2013 01:51:12 PM GMT
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: Sukanta
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.4
        Operating System: GNU/Linux

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Details:

Hi, 

I am using Octave 3.6.4 on Ubuntu 12.10 and 13.04. I have written a code for
solving certain fluid dynamics problem (~5000 lines) using Octave and the
openmpi_ext toolbox (version 1.1.0). I am noticing a strange problem: the
memory usage slowly increases with each iteration. I noticed this leak on all
the platforms I have access to: Ubuntu (12.04, 12.10, and 13.04) and RedHat
systems. The leak persists for all the recent versions of openmpi (1.6.2,
1.6.4, 1.7.1).

Since my original code is too complicated for others to debug, I created two
sample codes for testing (see attached).  The speedtest.m file was originally
written by Dr. Jeremy Kepner (MatlabMPI). I modified it to work in conjunction
with openmpi_ext. 

When I ran this code with valgrind:

valgrind --leak-check=yes -v --log-file=Valgrind.out mpirun -np 2 octave -q
--eval speedtest &

The summary of valgrind is:
==24981==    definitely lost: 42,031 bytes in 28 blocks
==24981==    indirectly lost: 25,802 bytes in 76 blocks
==24981==      possibly lost: 0 bytes in 0 blocks
==24981==    still reachable: 124,717 bytes in 603 blocks
==24981==         suppressed: 0 bytes in 0 blocks

The loss monotonically increases with increasing number of processors. The
other code (OCTLES_TEST.m) has similar issue. 

I also ran valgrind with massif: 

valgrind --tool=massif --time-unit=ms  mpirun -np 4 octave -q --eval
OCTLES_TEST &

The output of ms_print is attached. In general, the memory consumption
increases with time (some fluctuations are noticeable). This should not be the
case.

I would appreciate if you could help me out with identifying the memory
leak(s) in openmpi_ext. 



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File Attachments:


-------------------------------------------------------
Date: Mon 06 May 2013 01:51:12 PM GMT  Name: speedtest.m  Size: 4kB   By:
basu0009

<http://savannah.gnu.org/bugs/download.php?file_id=28028>
-------------------------------------------------------
Date: Mon 06 May 2013 01:51:12 PM GMT  Name: OCTLES_TEST.m  Size: 737B   By:
basu0009

<http://savannah.gnu.org/bugs/download.php?file_id=28029>
-------------------------------------------------------
Date: Mon 06 May 2013 01:51:12 PM GMT  Name: Valgrind.out  Size: 41kB   By:
basu0009

<http://savannah.gnu.org/bugs/download.php?file_id=28030>
-------------------------------------------------------
Date: Mon 06 May 2013 01:51:12 PM GMT  Name: MSPRINT  Size: 85kB   By:
basu0009

<http://savannah.gnu.org/bugs/download.php?file_id=28031>

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