[Bug 225602] Kmail is extremely slow and uses CPU without any reason

Thu Apr 15 14:35:13 BST 2010

https://bugs.kde.org/show_bug.cgi?id=225602

--- Comment #12 from Martin L ü c h e m <Heinrich20 gmx de>  2010-04-15 15:34:48 ---
Hi Thomas,

the situation improved a little bit. Some weeks everything seemed to be ok but 
then the problem reoccured. Now we have CPU usage up to 20%. This occurs in 
cycles!

This is the result of GDB. I hope, what I did is correct and helps:

Program received signal SIGINT, Interrupt.
0x00007fe43e12c743 in *__GI___poll (fds=<value optimized out>, nfds=<value 
optimized out>, timeout=3024)
    at ../sysdeps/unix/sysv/linux/poll.c:87
87      in ../sysdeps/unix/sysv/linux/poll.c
(gdb) backtrace
#0  0x00007fe43e12c743 in *__GI___poll (fds=<value optimized out>, nfds=<value 
optimized out>, timeout=3024)
    at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fe4365ac299 in ?? () from /lib/libglib-2.0.so.0
#2  0x00007fe4365ac6ec in g_main_context_iteration () from 
/lib/libglib-2.0.so.0
#3  0x00007fe43f66d39c in QEventDispatcherGlib::processEvents (this=0xbb9b40, 
flags=<value optimized out>)
    at kernel/qeventdispatcher_glib.cpp:407
#4  0x00007fe43eb54f1f in QGuiEventDispatcherGlib::processEvents 
(this=0x2a74600, flags=<value optimized out>)
    at kernel/qguieventdispatcher_glib.cpp:202
#5  0x00007fe43f643562 in QEventLoop::processEvents (this=<value optimized 
out>, flags=...)
    at kernel/qeventloop.cpp:149
#6  0x00007fe43f643934 in QEventLoop::exec (this=0x7fff597d8f20, flags=...) at 
kernel/qeventloop.cpp:201
#7  0x00007fe43f645ba4 in QCoreApplication::exec () at 
kernel/qcoreapplication.cpp:888
#8  0x0000000000402fa9 in main (argc=<value optimized out>, argv=<value 
optimized out>) at ../../kmail/main.cpp:146
(gdb)

next interrupt:

Continuing.
[New Thread 0x7fe4261b2910 (LWP 13205)]
[Thread 0x7fe4261b2910 (LWP 13205) exited]
[New Thread 0x7fe4261b2910 (LWP 13225)]
[Thread 0x7fe4261b2910 (LWP 13225) exited]
^C
Program received signal SIGINT, Interrupt.
0x00007fe43e12c743 in *__GI___poll (fds=<value optimized out>, nf               
ds=<value optimized out>, timeout=4989)
    at ../sysdeps/unix/sysv/linux/poll.c:87
87      in ../sysdeps/unix/sysv/linux/poll.c
(gdb) backtrace
#0  0x00007fe43e12c743 in *__GI___poll (fds=<value optimized out>, nfds=<value 
optimized out>, timeout=4989)
    at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fe4365ac299 in ?? () from /lib/libglib-2.0.so.0
#2  0x00007fe4365ac6ec in g_main_context_iteration () from 
/lib/libglib-2.0.so.0
#3  0x00007fe43f66d39c in QEventDispatcherGlib::processEvents (this=0xbb9b40, 
flags=<value optimized out>)
    at kernel/qeventdispatcher_glib.cpp:407
#4  0x00007fe43eb54f1f in QGuiEventDispatcherGlib::processEvents 
(this=0x2a74600, flags=<value optimized out>)
    at kernel/qguieventdispatcher_glib.cpp:202
#5  0x00007fe43f643562 in QEventLoop::processEvents (this=<value optimized 
out>, flags=...)
    at kernel/qeventloop.cpp:149
#6  0x00007fe43f643934 in QEventLoop::exec (this=0x7fff597d8f20, flags=...) at 
kernel/qeventloop.cpp:201
#7  0x00007fe43f645ba4 in QCoreApplication::exec () at 
kernel/qcoreapplication.cpp:888
#8  0x0000000000402fa9 in main (argc=<value optimized out>, argv=<value 
optimized out>) at ../../kmail/main.cpp:146
(gdb)

next interrupt:

Program received signal SIGINT, Interrupt.
0x00007fe43e12c743 in *__GI___poll (fds=<value optimized out>, nf               
ds=<value optimized out>, timeout=8540)
    at ../sysdeps/unix/sysv/linux/poll.c:87
87      in ../sysdeps/unix/sysv/linux/poll.c
(gdb) backtrace
#0  0x00007fe43e12c743 in *__GI___poll (fds=<value optimized out>, nfds=<value 
optimized out>, timeout=8540)
    at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fe4365ac299 in ?? () from /lib/libglib-2.0.so.0
#2  0x00007fe4365ac6ec in g_main_context_iteration () from 
/lib/libglib-2.0.so.0
#3  0x00007fe43f66d39c in QEventDispatcherGlib::processEvents (this=0xbb9b40, 
flags=<value optimized out>)
    at kernel/qeventdispatcher_glib.cpp:407
#4  0x00007fe43eb54f1f in QGuiEventDispatcherGlib::processEvents 
(this=0x2a74600, flags=<value optimized out>)
    at kernel/qguieventdispatcher_glib.cpp:202
#5  0x00007fe43f643562 in QEventLoop::processEvents (this=<value optimized 
out>, flags=...)
    at kernel/qeventloop.cpp:149
#6  0x00007fe43f643934 in QEventLoop::exec (this=0x7fff597d8f20, flags=...) at 
kernel/qeventloop.cpp:201
#7  0x00007fe43f645ba4 in QCoreApplication::exec () at 
kernel/qcoreapplication.cpp:888
#8  0x0000000000402fa9 in main (argc=<value optimized out>, argv=<value 
optimized out>) at ../../kmail/main.cpp:146
(gdb)

next interrupt:

Continuing.                                                                     
[New Thread 0x7fe4261b2910 (LWP 13241)]                                         
[Thread 0x7fe4261b2910 (LWP 13241) exited]                                      
[New Thread 0x7fe4261b2910 (LWP 13270)]                                         
[Thread 0x7fe4261b2910 (LWP 13270) exited]                                      
[New Thread 0x7fe4261b2910 (LWP 13312)]                                         
[Thread 0x7fe4261b2910 (LWP 13312) exited]                                      
[New Thread 0x7fe4261b2910 (LWP 13344)]                                         
[Thread 0x7fe4261b2910 (LWP 13344) exited]                                      
[New Thread 0x7fe4261b2910 (LWP 13361)]                                         
[New Thread 0x7fe424b60910 (LWP 13362)]                                         
^C                                                                              
Program received signal SIGINT, Interrupt.                                      
0x00007fe43e12c743 in *__GI___poll (fds=<value optimized out>, nf               
ds=<value optimized out>, timeout=29999)
    at ../sysdeps/unix/sysv/linux/poll.c:87
87      in ../sysdeps/unix/sysv/linux/poll.c
(gdb) backtrace
#0  0x00007fe43e12c743 in *__GI___poll (fds=<value optimized out>, nfds=<value 
optimized out>, timeout=29999)
    at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fe4365ac299 in ?? () from /lib/libglib-2.0.so.0
#2  0x00007fe4365ac6ec in g_main_context_iteration () from 
/lib/libglib-2.0.so.0
#3  0x00007fe43f66d39c in QEventDispatcherGlib::processEvents (this=0xbb9b40, 
flags=<value optimized out>)
    at kernel/qeventdispatcher_glib.cpp:407
#4  0x00007fe43eb54f1f in QGuiEventDispatcherGlib::processEvents 
(this=0x2a74600, flags=<value optimized out>)
    at kernel/qguieventdispatcher_glib.cpp:202
#5  0x00007fe43f643562 in QEventLoop::processEvents (this=<value optimized 
out>, flags=...)
    at kernel/qeventloop.cpp:149
#6  0x00007fe43f643934 in QEventLoop::exec (this=0x7fff597d6560, flags=...) at 
kernel/qeventloop.cpp:201
#7  0x00007fe43ef46c7e in QDialog::exec (this=0x7fff597d65f0) at 
dialogs/qdialog.cpp:498
#8  0x00007fe43fe1d48a in KMComposeWin::slotAttachFile (this=0x3a4df50) at 
../../kmail/kmcomposewin.cpp:2283
#9  0x00007fe43fe3f1c1 in KMComposeWin::qt_metacall (this=0x3a4df50, 
_c=QMetaObject::InvokeMetaMethod,
    _id=<value optimized out>, _a=0x7fff597d68c0) at ./kmcomposewin.moc:236
#10 0x00007fe43f659df2 in QMetaObject::activate (sender=0x3b38bb0, 
from_signal_index=<value optimized out>,
    to_signal_index=6, argv=0xffffffffffffffff) at kernel/qobject.cpp:3112
#11 0x00007fe43eab8147 in QAction::triggered (this=0x2a74600, _t1=false) at 
.moc/release-shared/moc_qaction.cpp:236
#12 0x00007fe43eab95c0 in QAction::activate (this=0x3b38bb0, event=<value 
optimized out>) at kernel/qaction.cpp:1167
#13 0x00007fe43ee30eda in QAbstractButtonPrivate::click (this=0x3be9fd0) at 
widgets/qabstractbutton.cpp:525
#14 0x00007fe43ee31175 in QAbstractButton::mouseReleaseEvent (this=0x3bc9900, 
e=0x7fff597d7220)
    at widgets/qabstractbutton.cpp:1115
#15 0x00007fe43eeffc2a in QToolButton::mouseReleaseEvent (this=0x2a74600, 
e=0xe) at widgets/qtoolbutton.cpp:709
#16 0x00007fe43eb0e37f in QWidget::event (this=0x3bc9900, 
event=0x7fff597d7220) at kernel/qwidget.cpp:7554
#17 0x00007fe43eabe01d in QApplicationPrivate::notify_helper (this=0xc0c140, 
receiver=0x3bc9900, e=0x7fff597d7220)
    at kernel/qapplication.cpp:4065
#18 0x00007fe43eac67ca in QApplication::notify (this=<value optimized out>, 
receiver=0x3bc9900, e=0x7fff597d7220)
    at kernel/qapplication.cpp:3767
#19 0x00007fe440ce4de6 in KApplication::notify (this=0x7fff597d90d0, 
receiver=0x3bc9900, event=0x7fff597d7220)
---Type <return> to continue, or q <return> to quit---

Am Dienstag, 2. März 2010, um 23:11:21 schrieb Thomas McGuire:
> https://bugs.kde.org/show_bug.cgi?id=225602
> 
> 
> 
> 
> 
> --- Comment #11 from Thomas McGuire <mcguire kde org>  2010-03-02 23:11:07
>  ---
> 
> > I can try to find out how to use GDB. It is installed at my machine and
> > it this should be a good way to finbd out the reason that makes my
> > machine slow.
> 
> Ok, this is how you use GDB for this:
> 
> 1. Attach GDB to the KMail process:
> gdb --pid `pidof kmail`
> 2. When GDB is done attaching, it has interrupted the application. Type
> "continue" to let it continue.
> 3. Press Ctrl+C at any time time to interrupt the application, and type
> "continue" again to let it continue
> 4. When KMail is interrupted, type "backtrace" to get a backtrace. That
>  will show you in which code path KMail currently is. If you manage to
>  interrupt KMail when it is using CPU, the backtrace should show which
>  function uses the CPU and how it is called.
> Try interrupting KMail several times, when it is using CPU. If the
>  backtraces have similar function names, then those functions are likely
>  the ones using the CPU. If you manage to find a backtrace that's nearly
>  always the same when KMail is using CPU, post it here.
>

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