[Konsole-devel] Review Request: patch to reduce memory usage for fixed-size history in konsole

[mick22 at gmx.at]

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Review request for Konsole.


Summary
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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 https://bugs.kde.org/show_bug.cgi?id=176974.
    https://bugs.kde.org/show_bug.cgi?id=https://bugs.kde.org/show_bug.cgi?id=176974


Diffs
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  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
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reasonably tested 


Thanks,

mick22