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ale3
Beginner
31 Views

Multi Mic affinity

I would like to run a heterogeneous program on a multi node cluster where each node comes with 2 MIC devices.
Let's consider for example 2 dual-sockets nodes:

-------------------        -------------------
--- NODE 1 --        --- NODE 2 --
       |                            |
 S    |  S                 S    |  S   
 o     |  o                 o    |  o   
 c     |  c                 c    |  c   
 k     |  k                 k    |  k   
 e     |  e                 e    |  e   
 t      |  t                  t    |  t   
 #1    |  #2              #1   |  #2  
-------------------        -------------------
MIC0  | MIC1         MIC0  | MIC1
-------------------        -------------------

If I execute 4 mpi processes, how can I assure that each mpi process will run on a different socket, and that each mpi-rank will offload on the MIC device connected to the socket where it is executed?

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Sunny_G_Intel
Employee
31 Views

Hi Ale,

Did you try using  "mpirun -ppn 2 -np 4 I_MPI_PIN_DOMAIN=socket ....".

Also I am assuming that you have Intel Xeon Phi coprocessors configured in external bridge topology and are able to ping each other across cluster.

Thanks

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