Memory and swap

When memory fills up, Linux closes the program using the most memory (a game, a database) and the server may stop answering. Swap prevents this: when memory is full, programs use this reserve area on the disk instead of being closed.

1. On the Summary tab, press Add on the “No swap” line.
2. If you leave the size empty, it is chosen automatically: 2 GB if memory is 2 GB or less, 4 GB otherwise.
3. Swap is permanent; it stays on after the server restarts.