cuda 编程 helloworld 打印 blockIdx和threadIdx
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#include <stdio.h>
__global__ void hello_from_gpu()
const int bid = blockIdx.x;
const int tid = threadIdx.x;
printf("Hello World from block %d and thread %d!\\n", bid, tid);
int main(void)
hello_from_gpu<<<2, 4>>>();
cudaDeviceSynchronize();
return 0;
nvcc hello4.cu -o hello4
./hello4
Hello World from block 1 and thread 0!
Hello World from block 1 and thread 1!
Hello World from block 1 and thread 2!
Hello World from block 1 and thread 3!
Hello World from block 0 and thread 0!
Hello World from block 0 and thread 1!
Hello World from block 0 and thread 2!
Hello World from block 0 and thread 3!
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