How to find usage of memory per process in linux

1.
ps aux | awk '{print $2, $4, $11}' | sort -k2rn | head -n 20

(in descending order for the first 20 processes)

2.
ps -e -orss=,args= | sort -b -k1,1n | pr -TW$COLUMNS

(all the processes in ascending order per memory)

3.
ps aux --sort -rss|more

(in descending order)

and

ps fauxwww

(shows all processes by thread very elegantly)