共享内存提供了最快的进程间通信方法，因为它以内存传输的速度来处理读写消息。
Shared memory provides the fastest method of interprocess communication, because it processes read and write messages at the speed of memory transfers.
当超出限制的时候，数据库就会开始拒绝读写，根据微软的建议，开发者必须通过通过异常处理以编程的方式处理这种情况。
When limits are exceeded the database will begin rejecting reads and writes and the developer must handle this programmatically through exception handling as suggested by Microsoft.
它们可用来向内存流控制器发出dma命令、处理SPE事件、向PPE和从PPE读写消息。
They are used for issuing DMA commands to the memory flow controller, handling SPE events, and reading and writing messages to and from the PPE.
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