Questions

• Describe the basic interaction between the CPU and GPU in a CUDA.

• The first activity in the CUDA lab involved commenting out various data transfer operations in the program.

  • What did this part of the lab demonstrate?

• Next, we compared the running time of two different procedures to run on the GPU.

  __global__ void kernel_1(int *a)
    int tid = threadIdx.x;
    int cell = tid % 32;
    a[cell]++;
  }
  
  
  __global__ void kernel_2(int *a) {
    int tid = threadIdx.x;
    int cell = tid % 32;
    switch(cell) {
          case 0:
            a[0]++;
            break;
          case 1:
            ...
  }

• What did this part of the lab demonstrate?