From Gentoo Wiki
iotop is a top-like utility that monitors system input/output.
The CONFIG_TASK_IO_ACCOUNTING variable must be enabled in the Linux kernel for the iotop command to work properly. It can be found at this location:
General setup -> CPU/Task time and stats accounting [*] Enable extended accounting over taskstats [*] Enable per-task storage I/O accounting
Install the package:
emerge --ask sys-process/iotop
Usage: iotop [OPTIONS] DISK READ and DISK WRITE are the block I/O bandwidth used during the sampling period. SWAPIN and IO are the percentages of time the thread spent respectively while swapping in and waiting on I/O more generally. PRIO is the I/O priority at which the thread is running (set using the ionice command). Controls: left and right arrows to change the sorting column, r to invert the sorting order, o to toggle the --only option, p to toggle the --processes option, a to toggle the --accumulated option, i to change I/O priority, q to quit, any other key to force a refresh. Options: --version show program's version number and exit -h, --help show this help message and exit -o, --only only show processes or threads actually doing I/O -b, --batch non-interactive mode -n NUM, --iter=NUM number of iterations before ending [infinite] -d SEC, --delay=SEC delay between iterations [1 second] -p PID, --pid=PID processes/threads to monitor [all] -u USER, --user=USER users to monitor [all] -P, --processes only show processes, not all threads -a, --accumulated show accumulated I/O instead of bandwidth -k, --kilobytes use kilobytes instead of a human friendly unit -t, --time add a timestamp on each line (implies --batch) -q, --quiet suppress some lines of header (implies --batch)
- top - A utility that displays Linux processes.
- atop - A top-like interactive monitor that displays load on the Linux system.
- htop - Another top-like clone that displays Linux processes.
- Nload — a super simple, command-line network interface monitoring tool.