矩阵乘法的java多线程程序，有swing做的界面，通过socket进行网络传输，这个是主程序，还有三个小的类也会传上去。-socket code

SUMMA并行矩阵的另一种MPI实现，在广播时以块为单位传输，运行速度明显提高-SUMMA parallel matrix another MPI implementation, the broadcast is transmitted in units of blocks, running speed is significantly improved