How to set process priorities in Linux?

Question

linux

Two tasks, A and B, are needed to do the same amount of work. But task A has a higher priority and needs more CPU time. Explain how this can be achieved in each of the Linux schedulers described in this chapter, in O(1) and in CFS.

Answer 1

But task A has a higher priority and needs more CPU time.

Understand what is priority in the O(1) Linux scheduler (i.e., more precisely, that nice is not a priority at all ... but there is some "compliance" ;-)) ... but on "make more time" can affect:

$ nice -n1 A
...
$ nice -n19 B
...

If you really want priorities, then you need "realtime priorities" and the chrt command , see Re:rare useful commands .

Answer 2

https://en.wikipedia.org/wiki/Nice
some priority levels can only be set as root.

Answer 3

nice -n10 ionice -c3 command arg1 arg2 arg3