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多个ＲＩＳＣＭ处理器构成的对称多处理器系统正在成为多机并行系统的主流产品。在对称多处理器系统中，所有处理器的地位都是相同的，所有的系统资源都具有相同的可访问性，系统依据仲裁算法自动调度处理器访问控制权。通过分析当前多处理器系统的代表机型Ｓｐａｒｃ２０的加电自检程序，对多机系统的处理器转换机制进行了研究，给出了其切换时机和实现过程的算法描述。
Symmetric multiprocessor systems composed of multiple RISCM processors are becoming mainstream products in multi-machine parallel systems. In a symmetric multiprocessor system, all processors have the same status, all system resources have the same accessibility, and the system automatically schedules processor access control based on an arbitration algorithm. By analyzing the power-on self-test program of the Sparc20, a typical multi-processor system, the processor conversion mechanism of multi-machine system is studied. The algorithm timing of the switching and the realization process are given.