这个数据库引擎非常精悍，只有约5000行代码，McObject对此感到骄傲。根据访问模式不同，运行时需要30K到300k的内存。

McObject boasts with a very small database engine core of about 5,000 lines, and the run-time needs between 30k and 300k of memory depending on access pattern.

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fencedUDF和存储过程：如果数据库上运行着一个 fenced函数或过程，那么数据库共享内存中有一个段要预留给 fenced模式的通信。

Fenced UDFs and Stored Procedures: If a fenced function or procedure is run on the database, then one segment is used for fenced mode communication.

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PPE可以通过在内核模式中使用内存映射寄存器来发起dma传输，而SPE则可以使用在SPU上运行的代码来写入dma通道。

The ppe does this through memory-mapped register access from kernel mode, while the SPE writes to its DMA channels from code running on the SPU.

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要解决这个问题，可以在unfenced模式下运行udf，或者将数据库共享内存减少至不多于5个段。

To resolve the problem, run UDF in an unfenced mode or reduce database Shared memory set to no more than 5 segments.

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错误检测：用户模式下的运行时内存崩溃。

Error detection: Runtime memory corruption in user code.

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RMM也将在InfiniBand和共享内存之上运行，能够以多点广播(一对多)和单点广播(一对一)的模式进行操作。

RMM will also work over InfiniBand and Shared memory, and can operate in either multicast (one-to-many) or unicast (one-to-one) mode.

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RMM也将在InfiniBand和共享内存之上运行，能够以多点广播(一对多)和单点广播(一对一)的模式进行操作。

RMM will also work over InfiniBand and Shared memory, and can operate in either multicast (one-to-many) or unicast (one-to-one) mode.

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