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Update 27/09/2017 - Added more comments  
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Multi GPU CUDA-MPI Version(N=25000, M=12500, GPUs/Node=2, Nodes=1, Tasks/Node=2): comp_t= 13.342609 ms, comm_t= 1756.819963 ms
Multi GPU CUDA-MPI Version(N=25000, M=6250, GPUs/Node=2, Nodes=2, Tasks/Node=2): comp_t= 6.707978 ms, comm_t= 1122.361183 ms
Multi GPU CUDA-MPI Version(N=25000, M=3125, GPUs/Node=2, Nodes=4, Tasks/Node=2): comp_t= 3.318169 ms, comm_t= 955.436945 ms
Multi GPU CUDA-MPI Version(N=25000, M=1563, GPUs/Node=2, Nodes=8, Tasks/Node=2): comp_t= 3.125570 ms, comm_t= 966.177940 ms
Multi GPU CUDA-MPI Version(N=25000, M=782, GPUs/Node=2, Nodes=16, Tasks/Node=2): comp_t= 2.513990 ms, comm_t= 871.755123 ms