Re: Fwd: Memory Leak & openmpi_ext

[Sukanta Basu]

I realized I sent a wrong version of the example code. Please see the
correct version attached.

On Tue, May 14, 2013 at 1:01 PM, Sukanta Basu <address@hidden> wrote:
> Dear Riccardo and Jordi,
>
> I created this simple for-loop problem for testing the memory issue in
> openmpi. If I run this code in serial mode with the same loop
> operation, the memory leak does not happen!
>
> Two related notes:
> (i) I used to use MatlabMPI with Matlab for the same code. I never
> witnessed this memory increase issue.
> (ii) The same code without openmpi (i.e., serial version) does not
> cause memory issue.
>
> In my research code, I have more than several dozens of functions
> within this iterative loop (a time-dependent operation in a CFD code).
> This loop cannot be vectorized.
>
> Also, deleting the variables from the workspace (after MPI_Send
> operation) is not an option. Because, some of the variables are needed
> in different functions. Since these variables are not growing in size
> with time/iteration, they should not increase memory consumption in
> any serious manner.
>
> Thanks for the links. I have been using Matlab/Octave for more than a
> decade and I am quite familiar with vectorization issues. Based on my
> experience (as an user and not a developer of Octave), vectorization
> helps tremendously in speeding up the operations. Having JIT compiler
> makes things really faster. However, I do not see why it should cause
> memory increase issues. May be I am missing something.
>
> Best regards,
> Sukanta
>
> On Tue, May 14, 2013 at 12:31 PM, Jordi Gutiérrez Hermoso
> <address@hidden> wrote:
>> On 14 May 2013 12:23, Riccardo Corradini <address@hidden> wrote:
>>> After sending to the master , clear all variables within each slave
>>> http://www.mathworks.it/it/help/matlab/ref/cellfun.html
>>> http://yagtom.googlecode.com/svn/trunk/html/speedup.html
>>> Also search vectorizaction tips on octave mailing list archive.
>>
>> Is this documentation any good?
>>
>>     
>> http://www.gnu.org/software/octave/doc/interpreter/Vectorization-and-Faster-Code-Execution.html
>>
>> - Jordi G. H.
>
>
>
> --
> 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/

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