If you want to know what exactly a program is doing, e.g. to find out why it's using 50% cpu right now, you can use the strace command:
strace -r -fF -T -p `pidof someprogram`
As always, you can find out more about the usage with man strace. It often does not respond to Ctrl-C in my experience, which is why I often kill it. killall -QUIT strace
And it also often forgets to restart the program it traced, so try a killall -CONT someprogram.
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