Modify/DEV/SHM Tmpfs file system size under Linux

The default system will load/DEV/SHM, which is called TMPFS, some say with RAMDisk (virtual disk), but not the same. Like a virtual disk, TMPFS can use your RAM, but it can also be stored using your swap partition. And the traditional virtual disk is a block device, and requires a command such as MKFS to really use it, TMPFS is a file system, not a block device; you just install it and it's ready to use.

TMPFS has the following advantages:
1. The size of the dynamic file system.

Another major benefit of the 2.TMPFS is its lightning-like speed. Because a typical TMPFS file system resides completely in RAM, read-write can be almost instantaneous.

3.TMPFS data is not retained after a reboot because virtual memory is inherently volatile. So it is necessary to do some scripts such as loading, binding operations. Typically use/DEV/SHM for shared memory Shm_open,shm_unlink). /DEV/SHM is a temporary Document System (TMPFS) that is capable of mount from/etc/fstab. Therefore, standard-supported parameters such as "size" can be used to increase or decrease the TMPFS size on/dev/shm. (by default, his size is half of the system RAM)

Adjust the size of the/DEV/SHM

1) View Size

Df-h/DEV/SHM

2) Size Change

vi/etc/0

3) Re-mount

umount/dev/SHM Mount/dev/shm

4) View the modified size

Df-h/DEV/SHM

5) Do not restart modify TMPFS size Mount-o Remount,size=38g/dev/shm

Modify/DEV/SHM Tmpfs file system size under Linux