Bug 567350

Could you try disabling krunner plugins to try to see if one of those are causing the problem?

Once krunner is visible, click the "wrench" on the left and start unchecking things.  Likely candidates include:
bookmarks, nepomuk, recent documents, spell checker, techbase, web*

Just to be sure, I tried all 3 built-in themes on this machine and set CPU to 'low' under Appearance..Style..Fine Tuning and that wasn't it.

I did hear the CPU fan kick in when testing, and watching under top it appears krunner takes 30% CPU for a couple seconds and it causes kcryptd to take about 70% for another 3-4 seconds (LUKS drive).  I wonder if there's a new disk I/O pattern in 4.4.

Good call, Rex, it's definitely 'bookmarks'.

Created attachment 395791 [details]
strace of krunner with bookmarks turned on

Running strace with timing, I see:

     0.000416 writev(3, [{"l\1\0\1\36\0\0\0\v\0\0\0\202\0\0\0\1\1o\0\20\0\0\0/MainApplication\0\0\0\0\0\0\0\0\6\1s\0\17\0\0\0org.kde.krunner\0\2\1s\0\32\0\0\0org.kde.KUniqueApplication\0\0\0\0\0\0\3\1s\0\v\0\0\0newInstance\0\0\0\0\0\10\1g\0\4ayay\0\0\0\0\0\0\0", 152}, {"\0\0\0\0\26\0\0\0\0\0\0\16/home/flowerpt\0\0\0\0", 30}], 2) = 182
     0.001068 gettimeofday({1266949304, 639290}, NULL) = 0
     0.000220 poll([{fd=3, events=POLLIN}], 1, 25000) = 1 ([{fd=3, revents=POLLIN}])
     4.967767 read(3, "l\2\1\1\4\0\0\0C\4\0\0.\0\0\0\6\1s\0\6\0\0\0:1.149\0\0\5\1u\0\v\0\0\0\10\1g\0\1i\0\0\7\1s\0\5\0\0\0:1.91\0\0\0\0\0\0\0", 2048) = 68

IIRC, that's a dbus request it's waiting for.

If I watch dbus, the main difference I'm seeing is a bunch of amarok requests:

> method call sender=:1.91 -> dest=org.freedesktop.DBus serial=1214
path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=AddMatch
> >    string
"type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.mpris.amarok'"
> > method call sender=:1.91 -> dest=org.freedesktop.DBus serial=1215
path=/org/freedesktop/DBus; interface=org.freedesktop.DBus;
member=RemoveMatch
> >    string
"type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.mpris.amarok'"
> > method call sender=:1.91 -> dest=org.freedesktop.DBus serial=1218
path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=AddMatch
> >    string
"type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.mpris.amarok'"
> > method call sender=:1.91 -> dest=org.freedesktop.DBus serial=1220
path=/org/freedesktop/DBus; interface=org.freedesktop.DBus;
member=RemoveMatch
> >    string
"type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.mpris.amarok'"
> > method call sender=:1.91 -> dest=org.freedesktop.DBus serial=1223
path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=AddMatch
> >    string
"type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.mpris.amarok'"
> > method call sender=:1.91 -> dest=org.freedesktop.DBus serial=1226
path=/org/freedesktop/DBus; interface=org.freedesktop.DBus;
member=RemoveMatch
> >    string
"type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.mpris.amarok'"
> > method call sender=:1.91 -> dest=org.freedesktop.DBus serial=1229
path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=AddMatch
> >    string
"type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.mpris.amarok'"
> > method call sender=:1.91 -> dest=org.freedesktop.DBus serial=1231
path=/org/freedesktop/DBus; interface=org.freedesktop.DBus;
member=RemoveMatch
> >    string
"type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.mpris.amarok'"
> > method call sender=:1.91 -> dest=org.freedesktop.DBus serial=1234
path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=AddMatch
> >    string
"type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.kde.kopete'"
> > method call sender=:1.91 -> dest=org.freedesktop.DBus serial=1235
path=/org/freedesktop/DBus; interface=org.freedesktop.DBus;
member=RemoveMatch
> >    string
"type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.kde.kopete'"
> > method call sender=:1.5 -> dest=org.kde.knotify serial=700
path=/Notify; interface=org.kde.KNotify; member=event

I'm not sure what to make of that.

err, "amarok and kopete", obviously.

This one should be better in 4.4.1, which we're going to get very soon, let's retest then.

This bug has been triaged

Steven M. Parrish
KDE & Packagekit Triager 
Fedora Bugzappers volunteer triage team
https://fedoraproject.org/wiki/BugZappers

Ping? Does this still happen with 4.4.1?

Appears to be fixed with 4.4.1.  I'm on a mildly faster machine now, but response is near-instantaneous, so that's probably not the reason.

Thanks.