Linux Troubleshooting Make Easy.

Linux Learning & Troubleshooting Make Easy.

How To Resize /dev/shm Filesystem

What is /dev/shm and  it's use ?

In Linux /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.





To increase or decrease /dev/shm filesystem size :

Open /etc/fstab with vi editor
#  vi /etc/fstab

Locate the line of /dev/shm and use the tmpfs size:
tmpfs      /dev/shm      tmpfs   defaults   0   0

To increase the Size to 500MB edit the line like:
tmpfs      /dev/shm      tmpfs   defaults,size=500m   0   0

To increase the Size to 3GB edit the line like:
tmpfs      /dev/shm      tmpfs   defaults,size=3g   0   0

To make change effective immediately, run this mount command:
#  mount -o remount /dev/shm

TO increase the /dev/shm size Temporarily : (It will come to default after Reboot):
#  mount -o remount,size=3G /dev/shm


##########################################################################


To disable /dev/shm immediately once only (but enable it on subsequent reboots):
#  umount /dev/shm


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