Conky

by specifying ${top_mem mem_res 1} or ${top mem_res 1} in .conkyrc
If I look at the firefox line, mem_res value changes at every refresh (from
6Mo to 230Mo...) and does not correspond to the value given by top.

by specifying ${top_mem mem 1} or ${top mem 1} in .conkyrc the value does
not change at every refresh and seems correct.

Distrib : Ubuntu intrepid 64bit

$ conky -V :
Conky 1.6.1 compiled Fri Oct 10 23:13:54 UTC 2008 for Linux
2.6.24-16-server (x86_64)

Compiled in features:

System config file: /etc/conky/conky.conf

X11:
* Xdamage extension
* Xdbe extension (double buffer)
* xft

Music detection:
* mpd

General features:
* math
* hddtemp
* portmon
* rss
* wireless


Hope it helps