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Thread: mixmode MPI/OpenCL

  1. #1
    Junior Member
    Join Date
    Jun 2010
    Posts
    2

    mixmode MPI/OpenCL

    Hello,

    I am scientist who develop High performance computing code. I developed applications using
    a classical mix mode API : MPI + OpenMP + SIMD. I am going to work on algebra application, since
    I discovered the speed up of a matrix product on GPU (X140 speed up), I decided to jump on
    the GPU and OpenCL.

    I started to program a few basic example, it runs quiet well. I started to associate a mpi/opencl code
    on my macbook (Intel core 2 duo + GeForce 9400M) in a "Hello word" mpi/OpenCL, great success.
    But I don't know if I could "divide" my gpu by two. If I understand well I have 256 cores in my gpu, so :

    1) Could I use 128 cores for one MPI task and 128 other for the second MPI task ?
    2) The first MPI task will complete its calculation on the GPU, and the second task will start just after ?
    3) Run a MPI/OpenCL code necessitates one CPU core for one GPU ?

    Thank you !

  2. #2
    Senior Member
    Join Date
    Nov 2009
    Posts
    118

    Re: mixmode MPI/OpenCL

    I don't know MPI but perhaps this extension can be of some interest :
    http://www.khronos.org/registry/cl/exte ... ission.txt

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