最後更新: 2018-07-23

介紹

iotop 是用來瀏覽系統即時 IO 的工具來

iotop 的 Output

# 用 iozone 測試 cifs 中

iotop

Total DISK READ :       6.29 M/s | Total DISK WRITE :       0.00 B/s
Actual DISK READ:       0.00 B/s | Actual DISK WRITE:       0.00 B/s
  TID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>    COMMAND
17618 be/4 root        0.00 B/s    0.00 B/s  0.00 % 96.26 % iozone -a -Rb /root/result.wks
17081 be/4 root        6.29 M/s    0.00 B/s  0.00 %  0.00 % [cifsd]
    1 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % init
.............

其他有用的 opts

# Only show processes or threads actually doing I/O

-o, --only 

i.e.

iotop -o

Total DISK READ:       0.00 B/s | Total DISK WRITE:     400.08 K/s
  TID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>    COMMAND
  875 be/4 root   

# 多耐計一次 IO 的平均

-d SEC, --delay=SEC

# 只看某些 Process 的 IO (List)

-p PID, --pid=PID

i.e.

iotop -p 8373

 TID  PRIO USER     DISK READ  DISK WRITE  SWAPIN    IO>       COMMAND
 8373 be/4 root     0.00 B/s   21.58 M/s   0.00 %    94.89 %   dd if=/dev/full of=/dev/sde bs=1M

iotop -p $P1 -p $P2

# 只看某 User 的 IO

-u USER, --user=USER

# 不看 threads 的 IO (Only show processes.)

-P, --processes

Total DISK READ:       6.20 M/s | Total DISK WRITE:       7.56 M/s
  PID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>    COMMAND
 4176 be/3 root        0.00 B/s    0.00 B/s  0.00 % 93.54 % [jbd2/dm-2-8]
  260 be/3 root        0.00 B/s    0.00 B/s  0.00 % 13.28 % [jbd2/sdb2-8]
17885 be/4 libvirt-    6.13 M/s    7.23 M/s  0.00 %  2.82 % kvm -S -M pc-1.0 -c~0,bus=pci.0,addr=0x4
10273 be/4 whoopsie   76.91 K/s   42.30 K/s  0.00 %  1.24 % mysqld --basedir=/u~qld.sock --port=3306
23139 be/4 root        0.00 B/s    3.85 K/s  0.00 %  0.00 % rotatelogs -f -l /v~cess.log.%Y.%m.%d 5M
    1 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % init

--quiet

• -q                  # column names are only printed on the first iteration
• -qq                # column names are never printed
• -qqq              # the I/O summary is never printed