ps axu | grep kwin
jindal    5729  0.1  1.4  26212 15300 ?        S    14:42   0:01 kwin --replace
jindal    9916  0.0  0.0   2860   692 pts/4    R+   15:04   0:00 grep kwin
03:04:40@~ $ kill -9 5729 && compiz --replace
libGL warning: 3D driver claims to not support visual 0x4b
/usr/bin/compiz.real: Another window manager is already running on screen: 0
/usr/bin/compiz.real: No manageable screens found on display :0
03:04:48@~ $ Window manager warning: Failed to read theme from file /usr/share/themes/Clearlooks/metacity-1/metacity-theme-1.xml: Failed to open file '/usr/share/themes/Clearlooks/metacity-1/metacity-theme-1.xml': No such file or directory
Window manager warning: Failed to load theme "Clearlooks": Failed to open file '/usr/share/themes/Clearlooks/metacity-1/metacity-theme-1.xml': No such file or directory