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SERVER:~ # free -h total used free shared buffers cached Mem: 31G 26G 4.5G 98M 0B 1.0G -/+ buffers/cache: 25G 5.4G Swap: 4.0G 68M 3.9G SERVER:~ # SERVER:~ # uptime 07:59am up 45 days 23:03, 1 user, load average: 0.00, 0.01, 0.05 SERVER:~ #

So there is literally no extra process running that can consume the memory.

Already issued a "echo 3 >/proc/sys/vm/drop_caches" but it was only 3G->to 1G cached RAM.

I think slowly something is lying about the memory usage.

If I rebooot the server, it will be ok, but in a few dozens of days later... all the memory is consumed again and even swap usage is starting to get bigger.

Before stopping the processes (for a custom software) I didn't seen anything from the "ps" command that says, a process is using high memory. Nothing.

The question: how to detect, what is using up all the memory? Is it a memory leak?

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  • try top -o +%MEM and observe the memory used by the processes. Commented Mar 24, 2020 at 12:56

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Try running free -g to see how much of the "used" memory is really just "cached". Cached memory will free up when needed.

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    We are already looking at the output of free - -g just changes the units displayed. Commented Jan 26, 2021 at 22:59

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