使用 iotop 監控哪些程式在進行I/O操作

我經常使用下面的命令來監控I/O操作：

iotop -d 5 -o

意思是每5秒顯示當前讀寫I/O的程式。更多引數：

-v, --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)
-c, --fullcmdline     show full command line
-1, --hide-pid        hide PID/TID column
-2, --hide-prio       hide PRIO column
-3, --hide-user       hide USER column
-4, --hide-read       hide DISK READ column
-5, --hide-write      hide DISK WRITE column
-6, --hide-swapin     hide SWAPIN column
-7, --hide-io         hide IO column
-8, --hide-graph      hide GRAPH column
-9, --hide-command    hide COMMAND column
-q, --quiet           suppress some lines of header (implies --batch)
-H, --no-help         suppress listing of shortcuts