CUDA学习——CUDA代码常用编写技巧(转)

1. 声明 __shared__ 变量或数组: __shared__ float sh_farr[ 256]; __shared__ int a; 2.结构体指针成员的分配设备内存: typedef struct Teacher_t ...{     int a;     unsigned int    *g_mem1;     float            *g_mem2; }Teacher; void initMem( Teacher& t, const unsigned int mat_size) ...{     unsigned int mat_size_ui = sizeof(int) * mat_size;     unsigned int mat_size_f = sizeof(float) * mat_size;     CUDA_SAFE_CALL( cudaMalloc((void**)&t.g_mem1, mat_size_ui) );     CUDA_SAFE_CALL( cudaMalloc((void**)&t.g_mem1, mat_size_f) );     ... } 3.计时: unsigned int timer = 0; CUT_SAFE_CALL( cutCreateTimer( &timer)); CUT_SAFE_CALL( cutStartTimer( timer)); ...{       ...//kernel } CUT_SAFE_CALL( cutStopTimer( timer)); printf( "Total time: %f ms ", cutGetTimerValue( timer) );     CUT_SAFE_CALL( cutDeleteTimer( timer)); 4. 获取输入命令行中包含的文件名: /**/ //! Check if a particular filename has to be used for the file where the result //! is stored //! @param argc number of command line arguments (from main(argc, argv) //! @param argv pointers to command line arguments (from main(argc, argv) //! @param filename filename of result file, updated if user specified //!                   filename /**/ void getResultFilename( int argc, char** argv, char*& filename) ...{     char* temp = NULL;     cutGetCmdLineArgumentstr( argc, (const char**) argv, "filename-result", &temp);     if( NULL != temp)     ...{         filename = (char*) malloc( sizeof(char) * strlen( temp));         strcpy( filename, temp);         cutFree( temp);     }     printf( "Result filename: '%s' ", filename); } 类似的: /**/ //! Check if a specific precision of the eigenvalue has to be obtained //! @param argc number of command line arguments (from main(argc, argv) //! @param argv pointers to command line arguments (from main(argc, argv) //! @param iters_timing numbers of iterations for timing, updated if a //!                      specific number is specified on the command line /**/ void getPrecision( int argc, char** argv, float& precision) ...{     float temp = -1.0f;     cutGetCmdLineArgumentf( argc, (const char**) argv, "precision", &temp);     if( temp > 0.0f)     ...{         precision = temp;     }     printf( "Precision: %f ", precision); } 5.Host调用完kernel函数需要进行线程同步,而在kernel或global函数只需要在必要的地方__syncthreads();即可: CUDA_SAFE_CALL( cudaThreadSynchronize()); 本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/dvchn/archive/2008/02/25/2119590.aspx