This question already has an answer here:
Is there an option in
top to show memory sizes in human readable format?
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3960 phil 20 0 1347280 383112 30316 S 0.0 9.5 6:59.45 firefox
It would be nicer to show RES as 374m (instead of 383112).
I'm currently using Arch Linux. Ubuntu seems to use human readable representations by default.
man top but could not find the option. Maybe I missed it.)