Thanks for your explanation.
I want to get a confirmation that my understanding is correct and that if I
use mmap_size=256M and I have only 1 process, then the PSS of the process
will always the same as the size of my db file, as unixMapfile(-1) means map
the whole file. (A big db file means 256M PSS) Is that correct?

In fact I had expected mmap only took up virtual memory instead of PSS.

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