这篇笔记摘自Professional CUDA C Programming：
Even though many-core and multicore are used to label GPU and CPU architectures, a GPU core is quite different than a CPU core.
A CPU core, relatively heavy-weight, is designed for very complex control logic, seeking to optimize the execution of sequential programs.
A GPU core, relatively light-weight, is optimized for data-parallel tasks with simpler control logic, focusing on the throughput of parallel programs.