Disk usage is different than what reported by df on the Ubuntu

[sangshuduo]

Environment

• OS:
  Ubuntu 20.04
• Node version: ($ node --version)

v12.22.6

• gtop version: ($ npm info gtop version)
• 1.1.2

Description

what df reports:

Filesystem Size Used Avail Use% Mounted on
udev 3.8G 0 3.8G 0% /dev
tmpfs 771M 1.9M 769M 1% /run
/dev/sda8 201G 92G 99G 49% /
tmpfs 3.8G 0 3.8G 0% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 3.8G 0 3.8G 0% /sys/fs/cgroup
/dev/loop1 128K 128K 0 100% /snap/bare/5
/dev/loop0 56M 56M 0 100% /snap/core18/2246
/dev/loop3 62M 62M 0 100% /snap/core20/1242
/dev/loop2 56M 56M 0 100% /snap/core18/2253
/dev/loop5 219M 219M 0 100% /snap/gnome-3-34-1804/72
/dev/loop4 62M 62M 0 100% /snap/core20/1270
/dev/loop6 219M 219M 0 100% /snap/gnome-3-34-1804/77
/dev/loop7 248M 248M 0 100% /snap/gnome-3-38-2004/87
/dev/loop8 65M 65M 0 100% /snap/gtk-common-themes/1514
/dev/loop9 55M 55M 0 100% /snap/snap-store/558
/dev/loop10 51M 51M 0 100% /snap/snap-store/547
/dev/loop11 66M 66M 0 100% /snap/gtk-common-themes/1519
/dev/loop12 43M 43M 0 100% /snap/snapd/14066
/dev/loop13 14M 14M 0 100% /snap/universal-ctags/552
/dev/loop14 44M 44M 0 100% /snap/snapd/14295
/dev/loop15 15M 15M 0 100% /snap/universal-ctags/749
/dev/sda6 2.7G 158M 2.4G 7% /boot
/dev/sda2 96M 31M 66M 32% /boot/efi
/dev/sda9 550G 92G 431G 18% /home
tmpfs 771M 648K 771M 1% /run/user/1000

what gtop reports:

[aksakalli]

Hi, gtop is showing the first disk entry from fsSize method of systeminformation. If you have multiple mounted disks, it might be different from what you expected.

[sangshuduo]

how about show the percentage of (total free size) / (total disk size)?