I am using Fedora Core 2 and the problem is that, after logging-in it works fine for 30 to 60 min and after that it just got itself busy in some other operation and system becomes unresponsive and very slow. I use GENOME and got System Terminal, but by running this, I can't know that which process is taking that much system resources... What is the problem and is there very nice and light tool through which I can know that which program immediately starts and use system like this so I can kill it. Before this the CPU works only 10 to 20% but after that it start working at 100%.
Thanks.

top

Then, you can use pkill, kill, or killall to kill the resource hogging app.

Cool

theres also gnome-system-monitor (might be called system-monitor in your menu)

If the slowness lasts for a while and then ends, and there is hard drive activity involved, it might be a [wiki]cron[/wiki] job i.e. some script or command scheduled to be run at certain times. In Fedora the jobs are arranged in directories named /etc/cron.xxx. After you've determined with top (and possibly ps -A f) which one is guilty, it's easy to remove it from /etc/cron.daily or /etc/cron.hourly (to some backup directory in case it's needed later).

Regards
Simon

I do have Gnome-System-Moniter but through that I can't estimate that which process is using CPU 100%. And this situation doesn't occure for few moments, it starts and completely slow downs the system and then I have to restart my system.
Thanks for replies.