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I noticed that serveral daemon invoked python seperately.
For example, I have both wicd and ibus daemon running on my machine. Instead of launching a single instance of python, the daemons run with two python instance at the same time in htop:

/usr/bin/python2 -O /usr/share/wicd/daemon/monitor.py
python2 /usr/share/ibus/ui/gtk/main.py

Is it a waste of doing that?
If yes, how can I improve this?
If no, why avoid putting all daemons run on a single python instance?

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No, it's not a waste. It is normal for separate programs to be running in separate processes, so that they couldn't (accidentally or intentionally) modify each other's state. Separate processes also mean that if one program crashes, all others are left unaffected.

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