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tmpfs : ウィキペディア英語版
tmpfs

tmpfs is a common name for a temporary file storage facility on many Unix-like operating systems. It is intended to appear as a mounted file system, but stored in volatile memory instead of a persistent storage device. A similar construction is a RAM disk, which appears as a virtual disk drive and hosts a disk file system.
== Semantics ==
Everything stored in tmpfs is temporary in the sense that no files will be created on the hard drive; however, swap space is used as backing store in case of low memory situations. On reboot, everything in tmpfs will be lost.
The memory used by tmpfs grows and shrinks to accommodate the files it contains and can be swapped out to swap space.
Many Unix distributions enable and use tmpfs by default for the /tmp branch of the file system or for shared memory. This can be observed with df as in this example:
Filesystem Size Used Avail Use% Mounted on
tmpfs 256M 688K 256M 1% /tmp
On some Linux distributions (e.g. Debian, Ubuntu), /tmp is a normal directory, but /dev/shm uses tmpfs.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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