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List:       konsole-devel
Subject:    Re: [Konsole-devel] Review Request: patch to reduce memory usage
From:       mick22 () gmx ! at
Date:       2009-06-08 8:52:05
Message-ID: 20090608085205.28551.45833 () localhost
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http://reviewboard.kde.org/r/802/
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(Updated 2009-06-08 01:52:05.008474)


Review request for Konsole.


Summary
-------

Here's a patch that drastically reduces mem usage when a fixed size history is
used:
- new history storage type "HistoryTypeQList"  (QList-based) set as replacement for \
                HistoryTypeBuffer
- compact storage for history lines

History lines are stored as an array of chars when possible (i.e. when
color and rendition flag of all characters in the line are equal). 2 bytes per \
character + overhead

When not (easily) possible, it falls back to the current way of storing history lines \
(array of QVector<Character>). 11 bytes per character + overhead

Memory usage has been cut down from about 171MB to 55MB for a konsole process
with 5 tabs, 30000 lines scrollback, 65 chars per line.


This addresses bug 176974.
    https://bugs.kde.org/show_bug.cgi?id=176974


Diffs
-----

  trunk/KDE/kdebase/apps/konsole/src/History.h 978802 
  trunk/KDE/kdebase/apps/konsole/src/History.cpp 978802 
  trunk/KDE/kdebase/apps/konsole/src/SessionController.cpp 978802 
  trunk/KDE/kdebase/apps/konsole/src/SessionManager.cpp 978802 

Diff: http://reviewboard.kde.org/r/802/diff


Testing
-------

reasonably tested 


Thanks,

mick22

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