[mvapich-discuss] question regarding threaded application

[khaled hamidouche]

Hi Alan,

Thanks for your note, we will take a look at this. In order to debug this
locally can you please share with us :

1)  your Configure options
2)  the amount of memory the mystery thread is taking in his setup
3)  your application (a reproducer)

Thanks



On Tue, May 6, 2014 at 11:38 PM, Alan Souza <alan.avbs at rocketmail.com>wrote:

> I have an application that make heavy use of some multi threaded libraries
> (openblas, the library was compiled to use OPENMP and with no thread
> binding) and umfpack. All communications are realized from the main thread
> (I already have tested some variations of MPI_Init_thread), B ut when I use
> the mvapich occurs some problems. On the cluster that I using each node has
> 8 cores and I am using only one MPI process per node.
>
> But when I was observing the process on some nodes I have noticed that was
> created 9 threads (one of them is keep active only on some serial parts and
> the others inactive. In the explicit threaded (using openMP) parts of the
> application eight threads are active and this one stays idle). The main
> problem with this to me is the increase of memory comsuption, because some
> allocations are done before the threeaded parts... . This behavior doesn't
> occur  neither using mpich nor OpenMPI.
>
> I use the following command to launch the jobs when using mvapich 2.0rc1:
>
> mpirun_rsh -np ${N} -hostfile host.txt MV2_ENABLE_AFFINITY=0
> MV2_IBA_HCA=mlx4_0 MV2_NUM_HCAS=1 OMP_NUM_THREADS=8 ./application parameters
>
> The hostfile contains the name of each node used and using the extended
> syntax :1 to indicate the number of processes per node.
>
>
> thanks
>
>
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