103.6 - تغییر اولویت‌های اجرای فرآیندها¶

$ top
Tasks: 169 total,   1 running, 168 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us,  3.0 sy,  0.0 ni, 97.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
MiB Mem :   5948.9 total,   4115.2 free,    438.2 used,   1395.5 buff/cache
MiB Swap:    975.0 total,    975.0 free,      0.0 used.   5210.3 avail Mem
PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
6496 jadi      20   0   10112   3704   3212 R   6.2   0.1   0:00.01 top
1 root      20   0  165172  10576   7780 S   0.0   0.2   0:02.80 systemd
2 root      20   0       0      0      0 S   0.0   0.0   0:00.09 kthreadd
3 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 rcu_gp
4 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 rcu_par_gp
6 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 kworker/0:0H-events_highpri
8 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 kworker/0:1H-events_highpri
9 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 mm_percpu_wq
10 root      20   0       0      0      0 S   0.0   0.0   0:00.00 rcu_tasks_rude_
11 root      20   0       0      0      0 S   0.0   0.0   0:00.00 rcu_tasks_trace

$ nice
0

$ ps -l
F S   UID   PID  PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
0 S  1000 15044 15035  0  80   0 -  7453 wait   pts/29   00:00:00 bash
0 S  1000 15052 15044  0  60 -20 -  3976 hrtime pts/29   00:00:00 sleep
0 R  1000 15080 15044  0  80   0 -  4680 -      pts/29   00:00:00 ps

$ nice -n 19 echo "I am running!"
I am running!
$ nice -n -20 echo "I am running!"
nice: cannot set niceness: Permission denied
I am running!
$ sudo nice -n -20 echo "I am running!"
I am running!

$ nice xeyes &
[1] 15217
$ ps -l
F S   UID   PID  PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
0 S  1000 15044 15035  0  80   0 -  7455 wait   pts/29   00:00:00 bash
0 S  1000 15217 15044  0  90  10 - 12522 poll_s pts/29   00:00:00 xeyes
0 R  1000 15218 15044  0  80   0 -  4680 -      pts/29   00:00:00 ps

$ ps -ef | grep firefox
jadi     13605 11226 30 08:28 ?        00:10:13 /usr/lib/firefox/firefox
jadi     15192 15044  0 09:01 pts/29   00:00:00 grep firefox
$ sudo renice -n -10 13605
13605 (process ID) old priority 5, new priority -10