A swap partition is not "needed". One can have a swap file instead. And one swap partition can be shared between several GNU/Linux distributions: specify it in the /etc/fstab file of each distribution.

Misty has 1 GB of RAM and 3 GB of swap. It is far enough swap: the swap being on a disk, it is about 100 times slower than RAM (10 times slower if we are talking an SSD disk): Misty will be fed up with an unbearably slow system before using even 1 GB of swap and she will start closing applications.

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