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Ionice-command

ionice - set or get process I/O scheduling class and priority

AVAILABILITY

The ionice command is part of the util-linux package and is available from

ftp://ftp.ker‐nel.org/pub/linux/utils/util-linux/.

EXAMPLES

       # ionice -c 3 -p 89

       Sets process with PID 89 as an idle I/O process.

       # ionice -c 2 -n 0 bash

       Runs 'bash' as a best-effort program with highest priority.

       # ionice -p 89 91

       Prints the class and priority of the processes with PID 89 and 91

NAME

       ionice - set or get process I/O scheduling class and priority

SYNOPSIS

       ionice [-c class] [-n level] [-t] -p PID...
       ionice [-c class] [-n level] [-t] command [argument...]

As of this writing, a process can be in one of three scheduling classes:

Idle

A program running with idle I/O priority will only get disk time when no other program has asked for disk I/O for a defined grace period. The impact of an idle I/O process on normal system activity should be zero. This scheduling class does not take a priority argument. Presently, this scheduling class is per‐mitted for an ordinary user (since kernel 2.6.25)