As per the best practices i agree with you 1.5 or 2x is your swap size and when you're working on VM we can use the swappiness parameter to decide the memory usage , for ex when your memory hits threshold at 60 then automatically it will start using swap by default but for physical machines it is less than 2x you can pick for configuration. Also if we use swap directly it is 200% slower than the physical RAM -always a thumb rule
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