* Samuel Sieb:

> Since you've brought this up, this is a question I've had for a long 
> time.  How do you get real memory+swap usage information for processes 
> or is that even possible?  Looking in ps or top, the RES is way too 
> small and the VIRT/VSIZE is way too big.  ps_mem is also way too small, 
> or at least the total is less than half of the real memory usage.  Is 
> there something else using that much memory that isn't processes? 
> buffers and cache don't account for the difference either.

There's a tool called smem which is supposed to attribute shared
mappings in a more reasonable way.  People use it with ZGC (pne of the
OpenJDK garbage collectors) because it maps the heap multiple times,
grossly inflating traditional RSS values.
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