Start process at boot with some niceness.
 

Dear all,
I want to boot my Debian Sid system such that after boot, my Xorg and plasma-desktop starts with -20 niceness and realtime ioniceness so that GUI becomes responsive for heavy load.

How can I do that.

Can anyone suggest where the Xorg and plasma-desktop startup file located so that I can change /usr/bin/X, /usr/bin/plasma-desktop written in those files to
nice -n -20 /usr/bin/...

Thanks.

If the GUI becomes more responsive under heavy load, any processes it executes will become even less responsive.

You could always just use renice after-the-fact.

I actually want that automatically the Xorg and plasma-desktop starts with desired priority, so that I do not have to manually renice every time after boot.

Who said anything about doing it manually? Just stick it in one of the startup scripts and you're done.

It depends on your distribution.

Changing the nice value can/will muck up your system fairly easily.

If your distribution uses systemd for startup, it also will only screw up the user. The problem is making the X server run with a lower priority than those applications using it. This can cause a priority inversion lockup. USUALLY this can be broken as any process hogging the server will eventually wait on the server... But even then, the X server will respond to it (and the other processes), but once it grabs the cpu again, the X server can get locked out - especially if that process is compute bound.

Under systemd nice values only affect the processes within a cgroup. They don't alter priorities between cgroups.