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

[mick22 at gmx.at]

-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
http://reviewboard.kde.org/r/802/
-----------------------------------------------------------

(Updated 2009-06-12 17:15:56.745097)


Review request for Konsole.


Changes
-------

Copy&paste bug of previous versions fixed.


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.

Update:
As suggested in https://bugs.kde.org/show_bug.cgi?id=176974#c20, a formatting array has been introduced in v2 of the patch. The CompactHistoryLine class can now handle single- and multi-color history lines. This replaces v1 of the patch where 2 separate classes were used.


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


Diffs (updated)
-----

  /trunk/KDE/kdebase/apps/konsole/src/SessionController.cpp 981222 
  /trunk/KDE/kdebase/apps/konsole/src/SessionManager.cpp 981222 
  /trunk/KDE/kdebase/apps/konsole/src/History.cpp 981222 
  /trunk/KDE/kdebase/apps/konsole/src/History.h 981222 
  /trunk/KDE/kdebase/apps/konsole/src/Character.h 981222 

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


Testing
-------

reasonably tested 


Thanks,

mick22