/dev/shm and swap differences and linkages

1. Basic theory

/dev/shm This file is a parasite, it's in memory.

Swap is temporarily dividing an area of the hard disk into memory usage

2. How to view

Use DF-LH to view/DEV/SHM

Use free-m to view swap files

3. Contact :/dev/shm are temporary documents

4. When to use

The superiority of/DEV/SHM file is discovered by Oracle, and it is popularized and used;

/DEV/SHM can put the session in PHP;

Swap this thing, in the case of memory so large today (previously I used the HP DL908 G7, Memory 4TB, impeccable), can not be used without using

See document: HTTPS://WIKI.ARCHLINUX.ORG/INDEX.PHP/TMPFS

/dev/shm and swap differences and linkages