I've recently switched to Xubuntu and just noticed a process I've not come across before---tumblerd that was eating about 100MB. I can't find much information about this, except for this on SourceForge. Should I be concerned?
It's another program called tumbler that is part of the XFCE standard installation (package
From the package description:
Tumbler is a D-Bus service for applications to request thumbnails for various URI schemes and MIME types. It is an implementation of the thumbnail management D-Bus specification described on http://live.gnome.org/ThumbnailerSpec.
(followed Daenyth's suggestion and moved this from a comment to an answer)
tumblerd may be eating lots of CPU if you:
are downloading some huge media file (e.g. movie) and
have the download folder open in Thunar.
I'm guessing every time the file grows a tiny bit,
tumblerd will check to see if it has changed, and try to remake the thumbnail. Closing the folder makes
(Apparantly it may even happen with completed downloads, though this may have been fixed in 12.04; I haven't confirmed it myself).
The bug still exists in Xubuntu 12.04 x64 for me. I had a folder open with several big MPEG2 files (complete size around 30GB) in Thunar and after starting one movie file in SMPlayer my system became unusable.
top revealed tumblerd as ressource hog. I disabled thumbnails in Thunar and deinstalled the tumbler package. Things are fine now.
BTW: None of the MPEG2 files was changing size.