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ionice:tldr:afdf5
The command ionice
is used in Linux systems to prioritize the input/output (I/O) scheduling of a process or command. It allows you to control the I/O priority and class of a specified command.
Here is a breakdown of the command you provided:
-
ionice
: This is the command itself. -
-c ${scheduling_class}
: This option sets the scheduling class for the command. The${scheduling_class}
is a placeholder for a value that specifies the scheduling class to use. There are three possible values for${scheduling_class}
:a.
0
(Default): Indicates none. The command will be run with the default scheduling class.b.
1
(Real-time): Indicates real-time scheduling class. This class provides the highest priority and is suited for time-critical tasks.c.
2
(Best-effort): Indicates best-effort scheduling class. This is the default class for most processes. -
-n ${priority}
: This option sets the I/O priority for the command. The${priority}
is a placeholder for a value that specifies the priority. The priority values range from0
(highest) to7
(lowest). -
${command}
: This is a placeholder for the actual command you want to run or execute with the specified I/O scheduling and priority.
In summary, the ionice
command is used to control the I/O priority and scheduling class of a given command, allowing you to prioritize or adjust its disk I/O operations.