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Modify the content of the nice and renice command entries #2429

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Modify the content of the nice and renice command entries #2429

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Modify the content of the nice and renice command entries
jimcat8 Oct 13, 2024
4979b58
Update 08-process.md
jimcat8 Oct 13, 2024
ae59443
Update 08-process.md
jimcat8 Oct 19, 2024
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28 changes: 22 additions & 6 deletions docs/books/admin_guide/08-process.md
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Expand Up @@ -314,17 +314,31 @@ The command `nice` allows the execution of a command by specifying its priority.
nice priority command
```

Example:
Usage example:

```bash
nice -n+15 find / -name "file"
nice --adjustment=-5 find / -name "file"

nice -n -5 find / -name "file"

nice --5 find / -name "file"
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-5 != --5

@jimcat8

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@jimcat8 jimcat8 Oct 13, 2024 •
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nice nice --3 nice
7

@wsoyinka

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@wsoyinka Are you still waiting for a change on this?


nice -n 5 find / -name "file"

nice find / -name "file"
```

Unlike `root`, a standard user can only reduce the priority of a process. Only values between +0 and +19 will be accepted.
Unlike `root`, a standard user can only reduce the priority of a process and only values between 0 and 19 will be accepted.

As shown in the example above, the first three commands indicate setting the Nice value to "-5", while the second command is our recommended usage. The fourth command indicates setting the Nice value to "5". For the fifth command, not typing any options means that the Nice value is set to "10".

!!! Tip

This last limitation can be lifted per-user or per-group by modifying the `/etc/security/limits.conf` file.
"Nice" is the abbreviation for "niceness".

Directly typing the `nice` command will return the Nice value of the current shell.

You can lift the Nice value limit for each user or group by modifying the `/etc/security/limits.conf` file.

The `renice` command allows you to change the priority of a running process.

Expand All @@ -335,7 +349,7 @@ renice priority [-g GID] [-p PID] [-u UID]
Example:

```bash
renice +15 -p 1664
renice -n 15 -p 1664
```

| Option | Description |
Expand All @@ -351,9 +365,11 @@ The `renice` command acts on processes already running. It is therefore possible
The `pidof` command, coupled with the `xargs` command (see the Advanced Commands course), allows a new priority to be applied in a single command:

```
$ pidof sleep | xargs renice 20
$ pidof sleep | xargs renice -n 20
```

To adapt to different distributions, you should try to use command forms such as `nice -n 5` or `renice -n 6` as much as possible.

### `top` command

The `top` command displays the processes and their resource consumption.
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