old c,cc examples

1 files changed, 48 insertions, 0 deletions

diff --git a/c,cc/vector_addition1.cu b/c,cc/vector_addition1.cu
new file mode 100644
index 0000000..9490ff3
--- /dev/null
+++ b/c,cc/vector_addition1.cu
@@ -0,0 +1,48 @@
+#include "stdio.h"
+
+
+__global__ void add_arrays_gpu( float *in1, float *in2, float *out, int Ntot)
+{
+  int idx=blockIdx.x*blockDim.x+threadIdx.x;
+  if (idx < Ntot)
+    out[idx]=in1[idx]+in2[idx];
+}
+
+
+int main(void)
+{
+  int N=10000, M=100000;
+  float **x = (float**) malloc(N*sizeof(float));
+  float **x_d = (float**) malloc(N*sizeof(float));
+  int i,j;
+
+  for (i = 0; i < N; i++) {
+    x[i] = (float*) malloc(M*sizeof(float));
+    cudaMalloc ((void **) &x_d[i], sizeof(float)*M);
+    for (j = 0; j < M; j++) {
+      x[i][j] = (float) j;
+    }
+    cudaMemcpy(x_d[i], x[i], sizeof(float)*M, cudaMemcpyHostToDevice);
+  }
+
+
+  /* Compute the execution configuration */
+//  int block_size=256;
+ // dim3 dimBlock(block_size);
+  //dim3 dimGrid ( (N/dimBlock.x) + (!(N%dimBlock.x)?0:1) );
+
+  /** Add arrays a and b, store result in c */
+ // add_arrays_gpu<<<dimGrid,dimBlock>>>(a_d, b_d, c_d, N);
+
+  /* Copy data from deveice memory to host memory */
+  //cudaMemcpy(c, c_d, sizeof(float)*N, cudaMemcpyDeviceToHost);
+
+  /* Print c */
+/*for(i=0; i<N; i++)
+    printf(" c[%d]=%f\n",i,c[i]);*/
+
+  /* Free the memory */
+//  free(a); free(b); free(c);
+//  cudaFree(a_d); cudaFree(b_d);cudaFree(c_d);
+}
+