https://docs.nvidia.com/cuda/cuda-runtime-api/group__CUDART__MEMORY.html#group__CUDART__MEMORY_1g71c078689c17627566b2a91989184969
cuda toolkit 中的sample介绍：https://docs.nvidia.com/cuda/cuda-samples/index.html#runtime-cudaapi__cudadevicesynchronize
cuda 编程文档：https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html
各个版本的cuda编程文档:https://developer.nvidia.com/cuda-toolkit-archive
一个比较好的GPU讲解网站，专门解读英伟达的用户手册https://bbs.gpuworld.cn/index.php?topic=59114.0