I wanted to know what mathematical connection is there between the SZ, RSS and VSZ output in ps output e.g.
ps -p 2363 -o sz,rss,vsz
sz and vsz represent the same thing, but sz is in page units, while vsz is in 1024 byte units.
To get your system's page size, you can use:
$ getconf PAGE_SIZE
rss is the subset of the process's memory that is currently loaded in RAM (in kilobytes). This is necessarily smaller than vsz.
So the "mathematical" connections are:
vsz * 1024 = sz * page_size
rss <= vsz
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