Red Hat Bugzilla – Bug 768807
qt assistant consumes 10 min of cpu time at start
Last modified: 2013-02-13 18:24:35 EST
Description of problem:qt assistant has unacceptable delay at start. It takes nearly 20 min wall time and over 10 min cpu before table of contents and index are displayed.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.start Qt designer
Qt Assistant appears, "updating search index" progress bar clears quickly, then
pig eats cpu for almost 20 min.
Usable help system within 60 sec.
loads virtually instantly for me.
$ rpm -q qt
qt-4.8.0-1.fc16.x86_64 (coming to updates-testing real soon)
Gee, Rex, can I come to Lincoln and use your computer ?
No, I don't doubt it does, but it doesn't work on my system. I would suspect that it is doing first-time processing (build indexes) at all startups. I did have it taken down by a Nautilus crash, so it may not have performed cleanup.
Afaik, there are no indexes needed to use assistant. I suspect something else at play here.
This morning I tried starting the assistant from activites->applications (gnome shell desktop) and it worked fine. Then I tried from inside the designer application, and it pigged out.
So I think there is a deadlock with some resource used by designer and assistant. Ideas ?
Maybe, but fwiw, I tested both cases, same result for me.
maybe it's something fixed in newer qt builds.
yum --enablerepo=updates-testing update qt
and see if that helps any?
> Afaik, there are no indexes needed to use assistant.
The Index and Search functionalities use indices. The search index in particular takes quite a while to process.
(but 20 minutes sounds really excessive to me, what CPU is that on?)
I enabled updates-testing, pulled down 4.8.0-0.29rc1.fc16 of qt, qt-assistant, -demos, -devel, -doc , -examples and -x11. No change, assistant works well from desktop, lousy from inside designer.
My next idea is that you are running kde desktop, I am running gnome-shell. I will try xfce. which I have installed, and install kde, and try that.
No, KDE desktop behaves the same way.
My next idea was to start the Assistant first, second start Designer, then start help from inside designer. I hoped the help action in Designer would find the active Assistant, and ask it to display Designer help.
Result was a second Assistant was started, with bad behaviour. I actually think not re-using the first Assistant, and starting a new one is a bug, or at least a poor design.
Further suggestions ?
I think another possible difference is the intel x driver on this system, which is not very good, causing me problems when the screensaver fires.
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