cuda by example 第六章光线追踪程序进行常量内存优化
通过本章学习了常量内存的使用以及通过事件来测量程序的性能
常量内存：当半个线程束(16个线程)都读取相同地址时，将该地址设为常量地址将大幅提升性能
定义方法：__constant__
传输数据采用函数：cudaMemcpyToSymbol()
事件：本质上为GPU的时间戳
定义方法：cudaEvent_t start; cudaEventCreate(&start);
记录当前时间点：cudaEventRecord(start, 0);
事件同步函数：cudaEventSynchronize(stop), 在stop之前的语句未执行之前阻塞后面的语句。
计算两个事件之间经历的时间：cudaEventElapsedTime(&elapsedTime, start, stop)
销毁事件：cudaEventDestroy()
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