Single GPU CUDA Version(N=25000, M=25000): t= 1775.302799 ms
Single GPU CUDA Coalesced Version(N=25000, M=25000): t= 31.533570 ms
Single GPU CUDA shmem Version(N=25000, M=25000): t= 26.177359 ms
Single GPU cuBLAS Version(N=25000, M=25000): t= 26.734490 ms