Re: Fwd: Memory Leak & openmpi_ext

[Sukanta Basu]

Hi,

I do not know if the following info are helpful:

(i) I monitored the "buffer" usage using "top" command. The buffer
number increases monotonically and with a constant rate (about 8
buffers every refresh time).

(ii) I installed the older version of openmpi_ext (1.0.2) via synaptic
(Ubuntu 13.04 has this version as default). The memory leak persists.
So, there is no difference between 1.0.2 and 1.1.0 in terms of memory
leak.

-Sukanta

On Mon, May 13, 2013 at 7:27 PM, Sukanta Basu <address@hidden> wrote:
> Hi Riccardo,
>
> Thanks for your response. I appreciate it.
>
> First of all, there is no mismatch in send-receive. I always get the
> "correct" MPI send/receive. Unfortunately, the memory usage increases
> continuously.
>
> Deleting variables from the octave workspace does not solve this problem.
>
> I have coded up very simple MPI programs here:
> https://savannah.gnu.org/bugs/index.php?38905
>
> These octave codes clearly show the memory leak problem.
>
> I do not have a good background C++. So, debugging the MPI_Send.cc and
> MPI_Recv.cc are difficult for me.
>
> Thanks again for your help!
>
> Best regards,
> Sukanta
>
> On Mon, May 13, 2013 at 7:56 AM, Riccardo Corradini
> <address@hidden> wrote:
>> Dear
>> Sukanta,
>> you may easily debug MPI_Send.cc and MPI_Recv putting some printf concerning
>> the integer flag info
>> int info = send_class (comm, args(0), tankrank, mytag);
>> printf("info for sending class = %i",info);
>> You may follow a bottom up approach for every brick you want to send and
>> receive. Finally you will find the flag that detetcts what is not working as
>> expected.
>> The older versions contained lots of pieces of code very similar, but they
>> were easier to debug in this naive way.
>> I would also suggest you to clear the variable once wou MPI_Send it.
>> Try to get rid of variables that you do not need. The master will receive
>> them, so this will save memory.
>> Bests
>> Riccardo
>>
>>
>> ________________________________
>> Da: Sukanta Basu <address@hidden>
>> A: address@hidden
>> Inviato: Domenica 5 Maggio 2013 19:56
>> Oggetto: Fwd: Memory Leak & openmpi_ext
>>
>> FYI
>>
>> ---------- Forwarded message ----------
>> From: Sukanta Basu <address@hidden>
>> Date: Sun, May 5, 2013 at 1:51 PM
>> Subject: Memory Leak & openmpi_ext
>> To: "c." <address@hidden>, Octave Forge
>> <address@hidden>, Carnë Draug
>> <address@hidden>
>>
>>
>> Hi Carlo and Carne,
>>
>> I hope all is well.
>>
>> A few months ago, you helped me with the openmpi_ext toolbox. This
>> toolbox works like a charm. Unfortunately, I am facing a memory leak
>> issue with this toolbox. 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 a sample code for testing. Basically, I modified the
>> speedtest.m file (written by Dr. Jeremy Kepner; MatlabMPI) to work in
>> conjunction with openmpi_ext. I then 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
>>
>> I would appreciate if you could help me out with identifying the
>> memory leak in openmpi_ext. I am attaching the speedtest.m file and
>> Valgrind.out file.
>>
>> Best regards,
>> Sukanta
>>
>> --
>> Sukanta Basu
>> Associate Professor
>> North Carolina State University
>> http://www4.ncsu.edu/~sbasu5/
>>
>>
>> --
>> Sukanta Basu
>> Associate Professor
>> North Carolina State University
>> http://www4.ncsu.edu/~sbasu5/
>> _______________________________________________
>> Help-octave mailing list
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>>
>>
>
>
>
> --
> Sukanta Basu
> Associate Professor
> North Carolina State University
> http://www4.ncsu.edu/~sbasu5/



-- 
Sukanta Basu
Associate Professor
North Carolina State University
http://www4.ncsu.edu/~sbasu5/