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what is /dev/shm

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Old 05-05-2009, 10:43 AM
mixmox mixmox is offline
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what is /dev/shm


hello. what is /dev/shm and why should us mounte it and how can we do it ?

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Old 05-05-2009, 11:39 AM
LoganNZ LoganNZ is offline
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Check out this article;
Quote:
/dev/shm is nothing but implementation of traditional shared memory concept. It is an efficient means of passing data between programs. One program will create a memory portion, which other processes (if permitted) can access. This will result into speeding up things on Linux.

shm / shmfs is also known as tmpfs, which 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 one which uses virtual memory instead of a persistent storage device.

If you type mount command you will see /dev/shm as a tempfs file system. Therefore, it is a file system, which keeps all files in virtual memory. Everything in tmpfs is temporary in the sense that no files will be created on your hard drive. If you unmount a tmpfs instance, everything stored therein is lost. By default almost all Linux distros configured to use /dev/shm.
Read MORE / SOURCE : http://www.cyberciti.biz/tips/what-i...cal-usage.html

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