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Why Is The Swap Usage High Even Though The Memory Shows 50% Or More Free? 

Apr 09, 2020 12:01 PM

Q:

Why is the swap usage is high even though the memory is 50% or more free?



A:
  • It is normal for Linux to use some swap, even if there is a free space in RAM.
  • There are many processes that require in-memory state for at least the time a request is being processed.
  • This is loaded to main memory. As and when its complete, processes like Radius and Policy server will move on to other requests.
  • Unused portions of memory are offloaded to swap just incase there is a request to load it back to memory.
  • If not loaded for a while, it will be removed / replaced in swap also.
  • It is not an issue as swap cannot grow beyond its limit.

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