Why Keep Swap Memory in Linux?

To cache rarely accessed pages. It is still better to keep them in swap than paging them out (discarding).
But always have enough RAM to hold your expected load.

Thorough Perf Tuning Guide

• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html-single/performance_tuning_guide/index

Reference

• https://haydenjames.io/linux-performance-almost-always-add-swap-space/

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