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As far as I know there are several memory concepts: VSS RSS PSS and USS, in which USS(unique set size) is the physical memory exclusively used by a process(correct me if needed).

I think this should be a very useful value to let me know which process uses too many physical memory?

But how could we get this value? By ps or from any /proc file?
(I know a smem tool could help, but is there any built-in method?)

Qiu Yangfan
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    Does this answer your question? [Getting information about a process' memory usage from /proc/pid/smaps](https://unix.stackexchange.com/questions/33381/getting-information-about-a-process-memory-usage-from-proc-pid-smaps) – aviro Aug 31 '23 at 09:19
  • @aviro Thanks for your response, but seems the post didn't provide answers directly. I need more time on this post and update my question. – Qiu Yangfan Sep 01 '23 at 01:48

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