I got the following problem when I used this command :
renice -19 1744
It does not require root permissions to lower the priority of any process that you own:
$ sleep 100 &
[1] 6965
$ renice 19 6965
6965 (process ID) old priority 0, new priority 19
Raising the priority does require root permission:
$ renice -19 6965
renice: failed to set priority for 6965 (process ID): Permission denied
$ sudo renice -19 6965
6965 (process ID) old priority 0, new priority -19
In sum, raising the priority requires root privilege: use sudo
.
renice
through sudo
.