这个SPU上下文会被当成一个类似的物理spu对待，当前的实现可以在它们之间强制进行直接映射。
This SPU context is treated like a physical SPU, and the current implementation enforces a direct mapping between them.
JPA 规范定义了对映射继承的三种类型的支持；其中只有一种在当前规范中是强制的
The JPA specification defines three types of support for mapping inheritance; only one is mandatory in the current specification
虽然内存使用从没蔓延，但是我们的应用在每妙秒中处理和映射200个命令时强制的执行了有意义的垃圾收集。
Although memory use never crept up, our application forced significant garbage collection when processing and mapping 20 commands per second.
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