smp 与mpp（国外英文资料）.doc

smp 与mpp（国外英文资料） Symmetric multiprocessor (SMP) concept and architecture of any changes to increase system complexity, in order to obtain satisfactory operation and performance, when using multiple processors have some design must pay attention. The additional complexity makes the role of the soft/hardware tradeoff much larger and more flexible than in a single-processor system. Different combinations of design responses and trade-offs make the architecture of a multiprocessor system more diverse. This section describes the major design considerations for multiprocessor systems and the hardware response to these items. There are several are many types of multiprocessing processing (MP) system, as follows: unshared MP (pure cluster) each processor is a completely independent of the machine, a copy of the operating system. There is no Shared part of the processor (each has its own memory, cache and disk), but they are interconnected. With a LAN connection, the processor is loosely coupled. The processor is tightly coupled by the converter connection. The communication between processors is achieved through messaging. The advantage of such a system is that it has great scalability and high availability. The downside is that the system is an unfamiliar programming model (messaging). The Shared disk MP processor has its own memory and cache. The processor runs parallel and shares the disk. Each processor runs a copy of the operating system, and the processor is loosely coupled (via a LAN connection). The communication between processors is achieved through information transfer. The advantage of the Shared disk is retained part of familiar programming model (disk is addressable and continuous data, and the memory is not), and compared with the Shared memory system, the system easier to achieve high availability. The disadvantage is that there is a bottleneck in the physical and logical access to Shared data, and its scalability is limited. Shared memory cluster (SMC) of a