[Bug 231849] New: digikam wakes up 107 times per second (powertop)

https://bugs.kde.org/show_bug.cgi?id=231849

           Summary: digikam wakes up 107 times per second (powertop)
           Product: digikam
           Version: 1.1.0
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: [hidden email]
        ReportedBy: [hidden email]


Version:           1.1.0 (using KDE 4.4.1)
OS:                Linux
Installed from:    Ubuntu Packages

digikam wakes up the cpu more than 100 times per second
without any user activity.
There are no special steps to reproduce, simply start digikam.

That makes digikam almost unusable on laptops when running on battery.

I will attach a strace log which shows it does busy waiting
by means of select and poll and does read from a file descriptor (7)
which points to a unix domain socket in spite of the fact that
the matching poll returned with a timeout.

# ls -l /proc/3182/fd/7
lrwx------ 1 me me 64 2010-03-22 22:25 /proc/3182/fd/7 -> socket:[33307]
# lsof | grep 33307
digikam   3182        me    7u     unix 0xffff8800df785200      0t0    33307
socket


Here the powertop output:

# sudo powertop -d
PowerTOP 1.12   (C) 2007, 2008 Intel Corporation

Collecting data for 15 seconds


Cn                Avg residency
C0 (cpu running)        (10.9%)
polling           0.0ms ( 0.0%)
C1 mwait          0.0ms ( 0.0%)
C2 mwait          0.1ms ( 0.2%)
C4 mwait          1.8ms (88.9%)
P-states (frequencies)
Turbo Mode     4.3%
  2.21 Ghz     0.0%
  1.60 Ghz     0.1%
  1200 Mhz     0.1%
   800 Mhz    95.5%
Wakeups-from-idle per second : 495.4    interval: 15.0s
no ACPI power usage estimate available
Top causes for wakeups:
  29.7% (232.7)   [Rescheduling interrupts] <kernel IPI>
  16.9% (132.6)   firefox-bin
  13.7% (107.1)   digikam
  12.5% ( 98.1)   [extra timer interrupt]
  10.7% ( 83.9)   [kernel scheduler] Load balancing tick

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--- Comment #1 from Stefan Fleiter <stefan fleiter web de>  2010-03-22 23:20:17 ---
Created an attachment (id=42191)
 --> (http://bugs.kde.org/attachment.cgi?id=42191)
strace of digikam running at pid 5292

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--- Comment #2 from Stefan Fleiter <stefan fleiter web de>  2010-03-22 23:48:22 ---
The pid of digikam changed when capturing the strace output because I had to
restart digikam. New pid is 5292.

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--- Comment #3 from Marcel Wiesweg <marcel wiesweg gmx de>  2010-03-24 19:41:56 ---
#0  __poll (fds=0x7c534b0, nfds=20, timeout=0) at
../sysdeps/unix/sysv/linux/poll.c:69
#1  0x00007fffed27258c in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007fffed2728d0 in g_main_context_iteration () from
/usr/lib64/libglib-2.0.so.0
#3  0x00007ffff17cdeb3 in QEventDispatcherGlib::processEvents (this=0xab6500,
flags=<value optimized out>)
    at kernel/qeventdispatcher_glib.cpp:412

#0  __poll (fds=0x7fffffffc920, nfds=1, timeout=-1) at
../sysdeps/unix/sysv/linux/poll.c:69          
#1  0x00007fffe8ca191a in ?? () from /usr/lib64/libxcb.so.1                    
#2  0x00007fffe8ca1e57 in ?? () from /usr/lib64/libxcb.so.1                    
#3  0x00007fffe8ca2115 in xcb_writev () from /usr/lib64/libxcb.so.1            
#4  0x00007fffefb5203a in _XSend () from /usr/lib64/libX11.so.6                
#5  0x00007fffefb52561 in _XEventsQueued () from /usr/lib64/libX11.so.6        
#6  0x00007fffefb3b24b in XEventsQueued () from /usr/lib64/libX11.so.6
#7  0x00007ffff2727747 in x11EventSourcePrepare (s=0xaf3140, timeout=<value
optimized out>) at kernel/qguieventdispatcher_glib.cpp:79
#8  0x00007fffed271fca in g_main_context_prepare () from
/usr/lib64/libglib-2.0.so.0
#9  0x00007fffed2723a1 in ?? () from /usr/lib64/libglib-2.0.so.0
#10 0x00007fffed2728d0 in g_main_context_iteration () from
/usr/lib64/libglib-2.0.so.0
#11 0x00007ffff17cdeb3 in QEventDispatcherGlib::processEvents (this=0xab6500,
flags=<value optimized out>)
    at kernel/qeventdispatcher_glib.cpp:412

#0  __poll (fds=0x7fffce984eb0, nfds=1, timeout=333) at
../sysdeps/unix/sysv/linux/poll.c:69          
#1  0x00007fffce98bc4e in ao_alsa_handle_event_thread () from
/usr/lib64/xine/plugins/1.27/xineplug_ao_out_alsa.so
#2  0x00007ffff142165d in start_thread (arg=<value optimized out>) at
pthread_create.c:297                        
#3  0x00007ffff079f14d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112                              
#4  0x0000000000000000 in ?? ()                                                

I got these three backtraces for poll. So it's either Glib, Xlibs or Xine/Alsa.
Not too much we can do about this.

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--- Comment #4 from Stefan Fleiter <stefan fleiter web de>  2010-03-24 19:55:25 ---
Thanks for collecting these backtraces.
From my other experiences with those bugs I assume that it might be xine which
does this.

If it indeed was xine wouldn't it help to lazy initialize it when it is needed
for playing some sound?
That way you could at least look at your photos without wasting energy.

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--- Comment #5 from Gilles Caulier <caulier gilles gmail com>  2010-03-25 08:19:05 ---
digiKam use KDE4 Phonon component to play video files, which use Xine as
backend...

Gilles Caulier

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--- Comment #6 from Gilles Caulier <caulier gilles gmail com>  2011-12-12 20:41:31 ---
Stefan,

This entry still valid using digiKam 2.x ?

Gilles Caulier

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--- Comment #7 from Michael G. Hansen <mike mghansen de>  2011-12-13 20:04:39 ---
Still valid under digikam 2.3 running under KDE 4.7 on debian experimental.
powertop reports about 100 wakeups per second.

Michael

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--- Comment #8 from Stefan Fleiter <stefan fleiter web de>  2011-12-13 21:33:38 ---
With Phonon configured with Gstreamer I have the following numers for
wakeups/second:

Before starting digikam: 80-90
With running digikam playing video: 260-270
With running digikam (after playing video): 120-130 (powertop can releate 20
Wakeups/second directly to digikam)

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--- Comment #9 from Marcel Wiesweg <marcel wiesweg gmx de>  2011-12-24 16:54:03 ---
Does powertop give us any clue (backtrace) from where the wakeups happen?

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--- Comment #10 from Stefan Fleiter <stefan fleiter web de>  2011-12-25 20:18:31 ---
AFAIK there is no possibility to get a backtrace from powertop.
If you have any information how to get a backtrace please provide a pointer
and I will try to provide it.

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--- Comment #11 from Gilles Caulier <caulier gilles gmail com>  2011-12-25 20:32:56 ---
Stefan,

Run digiKam through gdb like this :

http://www.digikam.org/drupal/contrib

Note : Don't forget to install digiKam debug package to see backtrace with GDB

Gilles Caulier

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--- Comment #12 from Marcel Wiesweg <marcel wiesweg gmx de>  2011-12-26 21:41:23 ---
You made some analysis with a strace output above, at the time still using
Xine. Now we all use GStreamer. Can you still pinpoint which of select or poll
is the culprit?
Sometime callgrind logs can be (ab)used to find out which method calls which

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--- Comment #13 from Gilles Caulier <[hidden email]> ---
This entry still valid using digiKam 3.5.0 ?

Gilles Caulier

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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |WAITINGFORINFO

--- Comment #14 from Gilles Caulier <[hidden email]> ---
We need a fresh feedback about this entry...

Gilles Caulier

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--- Comment #15 from Gilles Caulier <[hidden email]> ---
New digiKam 4.11.0 is available :

https://www.digikam.org/node/740

Can you reproduce the problem with this release ?

Gilles Caulier

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--- Comment #16 from Gilles Caulier <[hidden email]> ---
digiKam 4.12.0 is out :

https://www.digikam.org/node/741

We need a fresh feedback using this release please...
Thanks in advance.

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         Resolution|WAITINGFORINFO              |FIXED
   Version Fixed In|                            |5.1.0

--- Comment #17 from [hidden email] ---
With digiKam 5.0.0, this problem is not reproducible.
I close this file now. Don't hesitate to re-open if necessary.
Gilles Caulier

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