Public bug reported:
When I use thunar to open the image folders on a cell phone, and then I delete
or mv files away from the phone, this is what happens:
1) First, the thumbnail folder gets moved away / deleted.
2) Next, thunar attempts to create and re-fill the thumbnail folder as the
files are being deleted.
3) Amusingly, the thumbnailing process and the deletion process happen in the
same order, so if you watch carefully, you can see this:
3a) The upper left file starts out as a default icon.
3b) It is replaced with a thumbnail image
3c) It is deleted/moved away.
3d) A new file, with a default icon then fills the space.
On a slowish USB connection to a typical camera, you can see this
happening with the naked eye. Clearly, a lot of bandwidth is being
wasted writing and deleting thumbnail files on the camera. Remember,
thumbnails are stored on the device itself, so they eat USB bandwidth,
and they also trigger writes to the flash memory, and these writes can
be very slow.
If thunar runs the thumbnailing in a separate thread, and if ionice (or
the syscall equivalent) can operate on just the thumbnailing thread (and
not the rest of thunar), then setting the thumbnailing thread to the
"Idle" service class would probably do a fairly good job of solving the
problem. And it should nice itself, too.
Or, when thunar detects that the thumbnail folder is missing, the
thumbnailing thread could sleep several seconds before starting to re-
fill itself.
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: thunar 1.2.1-3ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
Uname: Linux 2.6.38-10-generic x86_64
Architecture: amd64
Date: Mon Jul 18 18:57:35 2011
InstallationMedia: Xubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427)
ProcEnviron:
LANGUAGE=en_GB:en
PATH=(custom, user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
SourcePackage: thunar
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: thunar (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug natty
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https://bugs.launchpad.net/bugs/812461
Title:
thunar thumbnailing very inefficient under rm
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