Linuxtracker占用cpu100%解决

Tracker is used (by gnome) to index files to make them searchable and appear automatically in some programs 
(like Rhythmbox for music files, etc). More info from the Ubuntu wiki on it here https://wiki.ubuntu.com/Tracker.
You can do a hard reset of the tags database and restart all the tracker processes with this command:
tracker reset -r

Use 
tracker daemon -t 
to terminate and 
tracker daemon -s 
to start the processes.