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  1. #include "cuda_runtime.h"
  2. #include "device_launch_parameters.h"
  3.  
  4. #include <stdio.h>
  5.  
  6. #define BLOCK_DIM 4
  7. #define GRID_DIM 1
  8. #define STEPS 4
  9.  
  10. __global__ void addKernel(int *output,int *input,int steps)
  11. {
  12.     int idx = threadIdx.x + blockIdx.x * blockDim.x;
  13. 	int ndx = threadIdx.x*steps + blockIdx.x * blockDim.x;
  14. 	int n = 0;
  15. 	if (idx < BLOCK_DIM * GRID_DIM)
  16. 	{
  17. 		for (int i = ndx; i < ndx+steps; i++)
  18. 		{
  19. 			output[idx] += input[i];
  20. 		}
  21. 	}
  22. }
  23.  
  24. int main()
  25. {
  26. 	const int Data_size = BLOCK_DIM * GRID_DIM * STEPS;
  27. 	const int PATHS = BLOCK_DIM * GRID_DIM;
  28.     int h_input[Data_size];
  29. 	int h_output[PATHS] = { 0 };;
  30.  
  31. 	for (int i = 0; i < Data_size; i++)
  32. 	{
  33. 		h_input[i] = i;
  34. 	}
  35.  
  36. 	cudaSetDevice(0);
  37. 	int *d_input;
  38. 	int *d_output;
  39.  
  40. 	cudaMalloc((void**)&d_input, sizeof(int) * Data_size);
  41. 	cudaMalloc((void**)&d_output, sizeof(int) * PATHS);
  42.  
  43. 	cudaMemcpy(d_input, h_input, sizeof(int) * Data_size, cudaMemcpyHostToDevice);
  44.  
  45. 	addKernel <<<GRID_DIM, BLOCK_DIM,0 >>>(d_output, d_input, STEPS);
  46. 	cudaDeviceSynchronize();
  47.  
  48. 	cudaMemcpy(h_output, d_output, sizeof(int) * PATHS, cudaMemcpyDeviceToHost);
  49.  
  50. 	for (int i = 0; i < PATHS; i++)
  51. 	{
  52. 		int k = i*STEPS;
  53. 		printf("Output[%d]={%d+%d+%d+%d}=%d.\n",i,k,k+1,k+2,k+3,h_output[i]);
  54. 	}
  55.  
  56. 	cudaFree(d_input);
  57. 	cudaFree(d_output);
  58.     cudaDeviceReset();
  59.     return 0;
  60. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.c:1:26: fatal error: cuda_runtime.h: No such file or directory
 #include "cuda_runtime.h"
                          ^
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/RwJCBZ
language:
C (gcc 8.3)
created:
11 years ago
visibility:
secret

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