The virtual memory manager attempts to keep at least the minimum amount of memory resident when the process is active, but it never keeps more than the maximum size.
虚拟内存管理器会尝试在进程处于活动状态时至少保留最小的常驻内存量，但决不会保留超过最大大小的内存量。
RSS is Resident Set Size, the non-swapped physical memory used by process.
RSS是驻留集合大小，即进程所使用的非交换区的物理内存。
But most algorithms are memory resident, typically assuming a small data size.
大部分算法是内存驻留算法，适用于小型数据集。
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