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mem_in_same_B.cu
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mem_in_same_B.cu
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#include <stdio.h>
__global__ void share_memory(float *gpu_data)
{
int tid = threadIdx.x;
float sum = 0.0f, average;
// declare shared memory
__shared__ float shar_mem[10];
shar_mem[tid] = gpu_data[tid];
// make sure the shared data write is complete
__syncthreads();
for (int i = 0; i < tid; i++)
sum += shar_mem[i];
average = sum / (tid + 1.0f);
gpu_data[tid] = average;
printf("%f\n", gpu_data[tid]);
printf("\n");
shar_mem[tid] = average;
printf("%f\n", shar_mem[tid]);
printf("\n");
}
int main()
{
float cpu_data[10];
float *gpu_data;
for (int i = 0; i < 10; i++)
cpu_data[i] = i * i;
cudaMalloc((void**)&gpu_data, sizeof(float) * 10);
cudaMemcpy(gpu_data, cpu_data, sizeof(float) * 10, cudaMemcpyHostToDevice);
share_memory<<<1, 10>>>(gpu_data);
cudaMemcpy(cpu_data, gpu_data, sizeof(float) * 10, cudaMemcpyDeviceToHost);
cudaFree(gpu_data);
return 0 ;
}