[kmail2] [Bug 373368] Opening new message very slow and freezes KMail for several second each

[René Krell]

https://bugs.kde.org/show_bug.cgi?id=373368

--- Comment #5 from René Krell  ---
Created attachment 102662
  --> https://bugs.kde.org/attachment.cgi?id=102662=edit
Compressed output of valgrind --tool=callgrind --instr-atstart=no plasmashell
for a few minutes after starting callgrind_control -i o

Added the compressed output of 'valgrind --tool=callgrind --instr-atstart=no
plasmashell' for a few minutes after starting 'callgrind_control -i o'.

I started callgrind_control when kmail started to be unresponsive, including
the rest of the plasmashell.

I'm not able to interpret the output shown in kcachegrind.
Can someone look at this, please?

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[kmail2] [Bug 373368] Opening new message very slow and freezes KMail for several second each

[René Krell]

https://bugs.kde.org/show_bug.cgi?id=373368

--- Comment #4 from René Krell  ---
I'm currently keeping plasmashell running in valgrind according to this
comment:
https://forum.kde.org/viewtopic.php?f=289=121533=7ab1403c4fedc79c23d4cadac1e09fd3=45#p343228
and waiting for plasmashell to fall into the high CPU load again, which is
apparently the reason for the unresponsiveness of KMail. As soon as this will
be the case I try to send some kcachegrind dump from it to get this issue to
the right direction.

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[kmail2] [Bug 373368] Opening new message very slow and freezes KMail for several second each

[René Krell]

https://bugs.kde.org/show_bug.cgi?id=373368

--- Comment #3 from René Krell  ---
Sorry, that was to fast.

Baloo isn't the cause. I run into this problem again with deactivated File
Search, but now I have plasmashell at high load:
  PID USER  PR  NIVIRTRESSHR S  %CPU  %MEM TIME+ COMMAND
 3392 rkrell20   0  0,255t 471020 187628 S 115,3 1,456  33:34.98
plasmashell

There is no comparable process in this situation with such a high CPU load.
Now even restarting KMail doesn't help.

Navigating between messages is almost unresponsive in both accounts, IMAP and
Local Folders.

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[kmail2] [Bug 373368] Opening new message very slow and freezes KMail for several second each

[René Krell]

https://bugs.kde.org/show_bug.cgi?id=373368

--- Comment #2 from René Krell  ---
The only process I saw with a high load during reproducing the problem was the
baloo_file_extractor. After that I switched off Search -> File Search -> [ ]
Enable File Search.

Deactivating the Baloo File Extractor might be way how to avoid the issue
reported here, I'll watch this several days.

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[kmail2] [Bug 373368] Opening new message very slow and freezes KMail for several second each

[René Krell]

https://bugs.kde.org/show_bug.cgi?id=373368

--- Comment #1 from René Krell  ---
Important addition: This problem doesn't happen right after system start, but
some time after using KMail (after several seconds, minutes or even hours). At
the moment I can't see it, but when it happens the notebook's fan is running on
higher speed, probably due to a high CPU load. As soon as the problem occurs,
KMail doesn't recover from it, so the high load remains instant until the next
system restart.

I nobody can reproduce this, please give me some hints what outputs to generate
and provide, and what to do else to help analyzing.

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