iotop
Created by : Mr Dk.
2023 / 02 / 19 20:53
Hangzhou, Zhejiang, China
Background
iotop 是一个类似 top 的 I/O 监视器。它能够在 Linux 2.6.20 及之后的内核中被用于监控进程或线程当前的 I/O 使用情况。使用 Python 实现。注意，运行这个程序需要 root 权限。
Usage
$ iotop -h
Usage: /usr/sbin/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)
--no-help suppress listing of shortcuts
$ iotop
Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s
Current DISK READ: 0.00 B/s | Current DISK WRITE: 0.00 B/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND 3168099 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.02 % [kworker/u4:0-events_freezable_power_]
1 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % init
2 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kthreadd]
3 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcu_gp]
4 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcu_par_gp]
6 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/0:0H-kblockd]
9 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [mm_percpu_wq]
10 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [ksoftirqd/0]
11 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcu_sched]
12 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [migration/0]
13 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [idle_inject/0]
14 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [cpuhp/0]
15 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [cpuhp/1]
16 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [idle_inject/1]
17 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [migration/1]
18 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [ksoftirqd/1]
20 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/1:0H-kblockd]
21 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kdevtmpfs]
22 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [netns]
23 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcu_tasks_kthre]
24 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kauditd]
25 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [khungtaskd]
26 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [oom_reaper]
27 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [writeback]
28 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kcompactd0]
keys: any: refresh q: quit i: ionice o: active p: procs a: accum sort: r: asc left: SWAPIN right: COMMAND home: TID end: COMMAND
使用 -o 参数只打印当前正在进行 I/O 的进程/线程。
使用 -p PID 参数可以只观测某个进程的 I/O。
使用 -a 参数可以进入 累加模式。输出的数值不是带宽（瞬时值），而是 iotop 启动后的累计值。
使用 -t 参数可以在每一行输出中带上时间戳。