simple-gemm

Collection of simple General Matrix Multiplication - GEMM implementations

C = a . A x B + C
if a = 1 and C = zeros
C = A x B

A and B are initialized with random numbers C is initialized with zeros

Arguments are always 3 matrix dimensions: args = [A_rows, A_cols (= B_rows), B_cols]

e.g. 5 5 5 or 10 10 10

CPU multithreading:

• GemmDenseThreads: native Julia Threads implementation

  $ cd GemmDenseThreads
  $ julia -t 4 gemm-dense-threads.jl 5 5 5    
  

• GemmDenseBlas: uses LinearAlgebra.jl (super-fast), if compiled with OpenBLAS set OPENBLAS_NUM_THREADS

  $ cd GemmDenseThreads
  $ OPENBLAS_NUM_THREADS=4 julia gemm-dense-blas.jl 5 5 5    
  

GPU :

• GemmDenseCUDA : uses CUDA.jl which uses the optimized cuBLAS (very fast) on NVIDIA GPUs

  $ cd GemmDenseCUDA
  $ julia gemm-dense-cuda.jl 5 5 5