[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Christoph Cullmann]

https://bugs.kde.org/show_bug.cgi?id=378579

Christoph Cullmann  changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 CC||cullm...@kde.org
 Resolution|--- |WONTFIX

--- Comment #14 from Christoph Cullmann  ---
I can agree that current Kate versions use more resources for large files.
On any "current" machine that you bought in the last 1-2 years, that is
normally no issue for anything below 100MB, if it has no expensive hl or
extremely long lines.
We will not have the resources to change the architecture to something that
will do it better.
Therefore this works for me as designed, I am sorry it brought inconveniences
for you.

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Rick Graves]

https://bugs.kde.org/show_bug.cgi?id=378579

--- Comment #13 from Rick Graves  ---
Some thoughts:

1) Package maintainers are volunteers and guys like me appreciate their
efforts.

2) kubuntu is not kde, but kde needs distributions.

3) Ideally, kde could encourage package maintainers to test using systems that
approximate the minimum hardware recommended by some popular distributions.  If
package maintainers only test using much more powerful hardware, they can
remain oblivious to, and in denial of, the problems encountered by some rank
and file users.

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=378579

Nate Graham  changed:

   What|Removed |Added

 CC||pointedst...@zoho.com

--- Comment #12 from Nate Graham  ---
This is clearly a performance bug, not some kind of intentional hardware
requirement. Thanks for finding it, Rick!

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Rick Graves]

https://bugs.kde.org/show_bug.cgi?id=378579

--- Comment #11 from Rick Graves  ---
Good news.  See the picture I uploaded -- a 4 core i5 3230M 2.60GHz laptop
(Lenovo Thinkpad Edge E431, came with Windows 8).  Testing as described using
kubuntu 16.04 (kate/kwrite version 5/15), performance is good.

For use on big files, it seems the minimum hardware requirements for the kate
editor exceed the minimum hardware requirements for kubuntu. 

Is the bottom line that for big files, kate needs 4 cores, 2 cores are not
enough?

In an ideal world, this would be up front, and people like me would not have to
discover it by trial and error.

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Rick Graves]

https://bugs.kde.org/show_bug.cgi?id=378579

--- Comment #10 from Rick Graves  ---
Created attachment 104985
  --> https://bugs.kde.org/attachment.cgi?id=104985=edit
4 core i5 3230M 2.60GHz laptop

laptop on which kate/kwrite performance is good on big files.

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Maciej Mrozowski]

https://bugs.kde.org/show_bug.cgi?id=378579

Maciej Mrozowski  changed:

   What|Removed |Added

 CC||reave...@gmail.com

--- Comment #9 from Maciej Mrozowski  ---
I checked your procedure and input text file, and cannot reproduce the problem
with kate-16.12.3, on i5-4300M 2.6GHz laptop. Pasting is instantaneous, when
scrolling the text using arrow keys, cursor stops blinking and visibly travels
line by line. Could you perhaps try some live dvd KDE distro with latest plasma
apps? For instance this one
http://cdimage.ubuntu.com/kubuntu/releases/17.04/beta-2/

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Rick Graves]

https://bugs.kde.org/show_bug.cgi?id=378579

--- Comment #8 from Rick Graves  ---
I tried kubuntu 16.04 (kate version 5/15) on my alternate office desktop (see
the picture I uploaded just now).  Following the test procedure described,
after hitting paste (Ctrl-V), the text took 5 seconds to appear, and after
hitting down arrow once, it took 6 seconds for the cursor to appear one line
down from the top.

The hardware is an Athlon II dual core CPU, 8 GB of memory, nVidia GeForce
8400GS display card, monitor with 1920 x 1080 pixels resolution.

Yes on this hardware kate version 3 (kubuntu 14.04) performs well, the pasted
text appears instantly, the cursor appears one line down instantly.

I believe my hardware all greatly exceeds the minimum recommended for kubuntu.

Two questions:

1) What is the minimum recommended hardware to run a QT5 application?  (I
looked and did not find on google.)

2) What hardware does the maintainer use to test kate and kwrite?

Thanks.

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Rick Graves]

https://bugs.kde.org/show_bug.cgi?id=378579

--- Comment #7 from Rick Graves  ---
Created attachment 104933
  --> https://bugs.kde.org/attachment.cgi?id=104933=edit
testing kubuntu 16.04 (kate version 5/15) on a kubuntu 14.04 (kate version 3)
desktop

On my alternate office desktop, I unplugged the hard drive on which kubuntu
16.04 (kate version 3) is installed and installed kubuntu 16.04 (kate version
5/15) on a spare hard drive.

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Rick Graves]

https://bugs.kde.org/show_bug.cgi?id=378579

--- Comment #6 from Rick Graves  ---
How does one activate highlighting? 

I am mostly using the default configuration.  For kate, I set the line length
limit to zero and I use spaces not tabs.

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Rick Graves]

https://bugs.kde.org/show_bug.cgi?id=378579

--- Comment #5 from Rick Graves  ---
The Thinkpad T500 uses the ATI Mobility Radeon HD 3650  display adapter
(http://www.thinkwiki.org/wiki/Category:T500).  I have the same problem with
kate and kwrite on my home desktop, which has a dual core Athlon II CPU and 16
GB of memory, on which kinfocenter says the display adapter is NVIDIA GT218
[GeForce 210].

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Rick Graves]

https://bugs.kde.org/show_bug.cgi?id=378579

--- Comment #4 from Rick Graves  ---
Created attachment 104929
  --> https://bugs.kde.org/attachment.cgi?id=104929=edit
Thinkpad T500 with kubuntu drives for 14.04 & 16.04

One laptop, two hard drives, 1) kubuntu 14.04 & 2) kubuntu 16.04.

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Rick Graves]

https://bugs.kde.org/show_bug.cgi?id=378579

--- Comment #3 from Rick Graves  ---
Bug 378330 seems to be related, but that one is only about the paste delay. I
use kate for small files (python scripts) and have no problem pasting into
small files.

If my only problem was the paste delay, I would live with it and I would never
have complained. For me, the much bigger aggravation is the arrow keys do not
work with keyboard repeat in 16.04 and 16.10, kate version 5/15 (kate says
version 15, kwrite says kate version 5).

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Dominik Haumann]

https://bugs.kde.org/show_bug.cgi?id=378579

--- Comment #2 from Dominik Haumann  ---
Just tested this: For me, following your instructions, Kate reacts snappy
without any delays, so I cannot reproduce. And if we cannot reproduce we cannot
do anything about it.

Do you have any highlighting activated?

What graphics card do you have? Could you google for this driver and kate,
whether you find other users that also have this issue?

How fast is your CPU?

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[kate] [Bug 378579] kate (and kwrite) on large files: version 3.7 is fine, version 15 sucks

[Dominik Haumann]

https://bugs.kde.org/show_bug.cgi?id=378579

--- Comment #1 from Dominik Haumann  ---
I have not yet tested this here locally, but I once heard that the graphics
driver may cause very slow behavior. It is unlikely you hit this, but still
this may be one reason. Besides that, Kate 3 uses Qt4, and Kate 5 uses Qt 5 -
so also the underlying Qt stack may cause this. This needs to be profiled.

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