renice

Wat het doet

Zo schrijf je het

renice [-n] PRIORITY [-g|-p|-u] ID...
renice --relative N [-g|-p|-u] ID...

Meest gebruikt

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$ als gewone gebruiker# als root (of met sudo)

1. 1Make a process nicer

   $renice -n 10 -p 4123
   4123 (process ID) old priority 0, new priority 10

   It now gives way to other processes.

2. 2Give a process more priority (root)

   #renice -n -10 -p $(pidof myapp)

   Only root may lower the value.

3. 3All processes of a user

   #renice -n 15 -u lisa

   A user with heavy jobs slows others less.

4. 4Normal user tries to go back

   $renice -n 0 -p 4123
   renice: failed to set priority for 4123 (process ID): Permission denied

   Users cannot raise their own priority again.

5. 5Add to the current value

   $renice --relative 5 -p 4123

   From 10 to 15.

6. 6Several processes at once

   #renice -n 5 -p $(pgrep -d ' ' dd)

   All dd processes.

7. 7Change a whole process group

   #renice -n 10 -g 4120

   A pipeline started together.

8. 8From top

   $top

   Press r, type the PID and the new value.

9. 9Check the result

   $ps -o pid,ni,cmd -p 4123

   Column NI.

10. 10Slow down a crypto miner while you investigate (security)

    #renice -n 19 -p 6666; kill -STOP 6666

    Stop it first, then collect evidence before you kill it.

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