How to read uwsgi stats output
As I can not yet comment (due to reputation) for anyone who is wondering how to see the RSS/VSZ values you need to set --memory-report in your uwsgi configuration, not when you execute uwsgitop.
See http://uwsgi-docs.readthedocs.org/en/latest/Options.html#memory-report
WID -> worker id
% -> percentage of served requests by the worker
PID -> process id of the worker
REQ -> number of managed requests
RPS -> number of current requests handled per second
EXC -> number of raised exceptions
SIG -> number of managed uwsgi signals (NOT unix signals !!!)
STATUS -> can be idle, busy, pause, cheaped or sig
AVG -> average response time for the worker
RSS -> RSS memory (need --memory-report)
VSZ -> address space (need --memory-report)
TX -> transmitted data
RunT -> running time