Watch all postgres processes, sorted by memory use

watch -n 1 '{ ps aux | head -n 1; ps aux --sort -rss | grep postgres | grep -v grep; } | cat'
Continuously watches postgres, showing the instances using the most RAM at the top.
Sample Output
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
postgres 26208  1.9 15.2 2079280 1874652 ?     Ss   08:52   1:12 postgres: app applications 127.0.0.1(33962) idle
postgres 28228  1.8 14.9 2079104 1837488 ?     Ss   09:08   0:52 postgres: app applications 127.0.0.1(36580) idle
postgres 26199  0.2 13.0 2077080 1610028 ?     Ss   08:52   0:07 postgres: checkpointer process
postgres 31773  1.2  9.9 2079112 1229632 ?     Ss   09:36   0:14 postgres: app applications 127.0.0.1(41738) idle
postgres 26200  0.0  2.0 2076948 246704 ?      Ss   08:52   0:01 postgres: writer process

0
2017-05-14 17:01:44

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