0_Simple__template

简单的 CUDA 应用模板，白送的 Sample。

▶ 源代码

 //template_cpu.cpp
 extern "C" void computeGold(float *, const unsigned int);

 void computeGold(float *idata, const unsigned int len)
 {
     const float f_len = static_cast<float>(len);
     for (unsigned int i = ; i < len; ++i)
         idata[i] *= f_len;
 }

 // template.cu
 #include <stdio.h>
 #include <cuda_runtime.h>
 #include "device_launch_parameters.h"
 #include <helper_functions.h>

 extern "C" void computeGold(float *, const unsigned int);

 __global__ void testKernel(float *g_idata, float *g_odata)
 {
     extern  __shared__  float sdata[];
     const unsigned int tid = threadIdx.x;

     sdata[tid] = g_idata[tid];
     __syncthreads();
     sdata[tid] = (float)blockDim.x * sdata[tid];
     __syncthreads();
     g_odata[tid] = sdata[tid];
 }

 int main()
 {
     printf("\n\tStart.\n");

     cudaSetDevice();
     StopWatchInterface *timer = ;
     sdkCreateTimer(&timer);
     sdkStartTimer(&timer);

     unsigned int num_threads = ;
     unsigned int mem_size = sizeof(float) * num_threads;
     float *h_idata, *h_odata, *d_idata, *d_odata;
     h_idata = (float *)malloc(mem_size);
     h_odata = (float *)malloc(mem_size);
     cudaMalloc((void **) &d_idata, mem_size);
     cudaMalloc((void **)&d_odata, mem_size);
     for (unsigned int i = ; i < num_threads; ++i)
         h_idata[i] = (float)i;
     cudaMemcpy(d_idata, h_idata, mem_size, cudaMemcpyHostToDevice);

     testKernel << < dim3(, , ), dim3(num_threads, , ), mem_size >> > (d_idata, d_odata);
     //getLastCudaError("Kernel execution failed");// 检查内核调用的报错结果
     cudaMemcpy(h_odata, d_odata, sizeof(float) * num_threads, cudaMemcpyDeviceToHost);
     cudaDeviceSynchronize();

     sdkStopTimer(&timer);
     printf("\n\tProcessing time: %f ms\n", sdkGetTimerValue(&timer));
     sdkDeleteTimer(&timer);

     computeGold(h_idata, num_threads);
     printf("\n\tFinish, return %s.\n", compareData(h_idata, h_odata, num_threads, 0.0f,0.0f) ? "Passed" : "Failed");

     free(h_idata);
     free(h_odata);
     cudaFree(d_idata);
     cudaFree(d_odata);
     getchar();
     return ;
 }

▶ 输出结果：

    Start.

    Processing time: 101.169357 ms

    Finish, return Passed.

▶ 涨姿势：没有