采用MPI_send和MPI_Recv实现MPI_Allgather的功能，并测试对比你的实 现和MPI原有实现的性能-To adopt MPI_send and MPI_Recv the functionality of MPI_Allgather and to test the contrast you achieve and original MPI to achieve performance

各种实时操作系统与windowsce性能的对比,可以发现windowsce的优缺点-All kinds of real-time operating system and the performance of the windowsce contrast, can find the advantages and disadvantages of windowsce