linux里面swap和swpd区别

linux里面swap和swpd区别

Definition: swapd: Swap daemon for dynamic swap file
creation. Swapd is a dynamic swapping manager for Linux. It provides the
system with as much swap space (virtual memory) as is required at a
particular time by dynamically creating swap files. This is more
convenient than using fixed swap files and/or partitions because they
(a) are unused most of the time and are just taking up disk space; and
(b) provide a limited amount of virtual memory.

On systems that have constant need for virtual
memory it would still be wise to use a swap partition in parallel with
dynamic swapping, since swap partitions provide much faster access than
swap files.

定义：swapd：Swap daemon (交换文件守护程序) 的作用是建立动态的交换文件(swap file). Swapd 是一个Linux的动态交换文件管理器。它通过动态地建立交换文件，在特定的时段为系统提供所需的交换空间（虚拟内存）。这比使用大小固定的交换文件(swap file)或者交换分区更方便，(a)因为那些交换文件或者交换分区在大多数时间里都没用到，反倒是一直占着磁盘空间;(b)它们能提供的虚拟内存，大小有限。
在那些对虚拟内存有稳定需求的系统上，并行使用交换分区和动态交换文件仍不失为明智的选择，因为交换分区比交换文件的读写速度快得多。

上面是原文，下面是我的翻译，仅供参考。