ramfs/tmpfs: Linux RAM filesystems

Previously in windows, I uses ramdisk, to accelerate chrome browsing. However, in linux, this is made possible by tmpfs/ramfs already by default.

Also can be specified (according to archwiki)by running:

echo "tmpfs    /tmp    tmpfs    defaults,size=100M    0 0" >> /etc/fstab 

Let us use tmpfs by:

mount -t tmpfs -o size=20M tmpfs /dir

Where we can see this dir by df -h command. The /dir lookes like a 'real' disk on our server.

We can use ramfs by:

mount -t ramfs -o size=20M ramfs /dir

After this we can only check this dir as ramfs by:

mount -l | grep dir

Note:

The 2 file sytems are exactly the same except for 2 differences:

1. tmpfs's size option is the maximum size of the dir (starting as 0kb), but ramfs's is the starting size of the dir;

2. ramfs always be on ram, tmpfs might use SWAP area.

The above 2 differences make tmpfs may come across speed problem and ramfs meet with out of ram exception.

un-mount these partitions by:

umount /dir