Efficiently Initializing Shared Memory Array in CUDA

Question

Note that this shared memory array is never written to, only read from.

As I have it, my shared memory gets initialized like:

__shared__ float TMshar         


        

Answer 1

Use all threads to write independent locations, it will probably be quicker.

Example assumes 1D threadblock/grid:

#define SSIZE 2592

__shared__ float TMshared[SSIZE]; 

  int lidx = threadIdx.x;
  while (lidx < SSIZE){
    TMShared[lidx] = TM[lidx];
    lidx += blockDim.x;}

__syncthreads();