一个基于OpenMp并行编程的实例，基于多线程，多线程比单线程下节省运行时间的典型例子。算法内容主要是计算矩阵乘积，再求个元素和。可通过"任务管理器"-"性能"查看运行在多核上。-Typical example of a parallel programming based OpenMp instance, save run time based on the multi-threaded, multi-threading than single-threaded. The algorithm