physical swap-out 计算机实际换出
Answer: If you want your applications to perform, the application server instance's JVM should not swap out of physical memory.
答：如果希望应用程序正常执行，则不应该将应用服务器实例的jvm换出物理内存中。
When running on a system with more process address space than physical memory, a memory leak or excessive use of native memory will force the OS to swap out some of the virtual address space.
在进程地址空间大于物理内存的系统中，内存泄漏或本机内存过度使用会迫使操作系统提供一些虚拟地址空间。
To accomplish this feat, the Memory Manager needs to swap page frames in and out of physical memory.
要实现这个壮举，内存管理器需要交换页面结构进出物理内存。
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