RD MA支持读或写另一台计算机的内存，并且不需要占用目标计算机的任何处理周期。
RDMA allows one computer to read or write to the memory of another computer without requiring any processor cycles on the target machine.
释放J VM结构的操作让gc线程以一种安全的形式处理这些结构；对部分更新的结构进行读和写操作可能导致不可预测的行为和冲突。
The act of releasing JVM structures lets the GC thread process these structures in a safe fashion; reading and writing to partially updated structures can cause unexpected behavior and crashes.
现有 JMM 表明易失性的读和写是直接和主存打交道的，这样避免了把值存储到寄存器或者绕过处理器特定的缓存。
The existing JMM says that volatile reads and writes are to go directly to main memory, prohibiting caching values in registers and bypassing processor-specific caches.
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