sudo pidstat -d -T ALL -p `pidof snapd` 5

18时51分41秒   UID       PID   kB_rd/s   kB_wr/s kB_ccwr/s iodelay  Command
18时51分46秒     0      4326      0.00   7019.20      0.00       0  snapd

18时51分46秒   UID       PID   kB_rd/s   kB_wr/s kB_ccwr/s iodelay  Command
18时51分51秒     0      4326      0.00   7254.40      0.00       0  snapd

18时51分51秒   UID       PID   kB_rd/s   kB_wr/s kB_ccwr/s iodelay  Command
18时51分56秒     0      4326      0.00   7230.40      0.00       0  snapd

18时51分56秒   UID       PID   kB_rd/s   kB_wr/s kB_ccwr/s iodelay  Command
18时52分01秒     0      4326      0.00   7120.00      0.00       0  snapd

18时52分01秒   UID       PID   kB_rd/s   kB_wr/s kB_ccwr/s iodelay  Command
18时52分06秒     0      4326      0.00   7016.80      0.00       0  snapd
^C

平均时间:   UID       PID   kB_rd/s   kB_wr/s kB_ccwr/s iodelay  Command
平均时间:     0      4326      0.00   7128.16      0.00       0  snapd

snap changes

ID   Status  Spawn               Ready               Summary
91   Done    today at 17:14 CST  today at 17:14 CST  Connect 
chromium:password-manager-service to core:password-manager-service
92   Error   today at 17:19 CST  today at 17:56 CST  Refresh snaps 
"gtk-common-themes", "core", "core18", "code", "intellij-idea-community", 
"gnome-3-26-1604", "gnome-3-28-1804", "chromium"
93   Error   today at 18:00 CST  today at 18:06 CST  Refresh snaps 
"gtk-common-themes", "core", "code", "intellij-idea-community", 
"gnome-3-26-1604", "gnome-3-28-1804", "chromium"
94   Error   today at 18:06 CST  today at 18:08 CST  Refresh snaps "core", 
"code", "intellij-idea-community", "gnome-3-26-1604", "gnome-3-28-1804", 
"chromium", "gtk-common-themes"
95   Doing   today at 18:09 CST  -                   Refresh snaps "core", 
"code", "intellij-idea-community", "gnome-3-26-1604", "gnome-3-28-1804", 
"chromium", "gtk-common-themes"

snapd shows a ~7MB/s disk writes while the download is very slow (only
~50KB/s on nethogs).

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https://bugs.launchpad.net/bugs/1839237

Title:
  snapd disk write usage very high on 19.04 with snapd 2.39.3

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