Run Linux processes with different runtime policy

chrt 19 dd if=/dev/zero of=/dev/null

Even we setup the priority of 19 the process will run with the default real-time policy and will set the priority to -20

chrt allows to change the process run policy. There are 2 real-time policies --rr (round-robin) and --fifo. And there are 3 normal policies --batch, --idle and --other