I have same problem on my Ubuntu 9.04. I'm using freenx and every user connected over network have f-u-s-a running.
Those processes causes high cpu load. I'll attach strace.
#top
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
7827 zdenek 20 0 25988 13m 9.9m S 99.5 2.6 0:08.89 fast-user-switc
#ps aux
zdenek 7827 99.4 2.6 25988 13500 ? R 21:44 3:16 /usr/lib/fast-user-switch-applet/fast-user-switch-applet
--oaf-activate-iid=OAFIID:GNOME_FastUserSwitchApplet_Factory --oaf-ior-fd=20
# uname -a
Linux nx 2.6.28-14-generic #47-Ubuntu SMP Sat Jul 25 00:28:35 UTC 2009 i686 GNU/Linux
I have same problem on my Ubuntu 9.04. I'm using freenx and every user connected over network have f-u-s-a running.
Those processes causes high cpu load. I'll attach strace.
#top
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
7827 zdenek 20 0 25988 13m 9.9m S 99.5 2.6 0:08.89 fast-user-switc
#ps aux fast-user- switch- applet/ fast-user- switch- applet iid=OAFIID: GNOME_FastUserS witchApplet_ Factory --oaf-ior-fd=20
zdenek 7827 99.4 2.6 25988 13500 ? R 21:44 3:16 /usr/lib/
--oaf-activate-
# uname -a
Linux nx 2.6.28-14-generic #47-Ubuntu SMP Sat Jul 25 00:28:35 UTC 2009 i686 GNU/Linux