[Konsole-devel] [Bug 176974] High memory consumption when using Konsole for a longer time.

Robert Knight robertknight at gmail.com
Mon Jun 8 22:35:43 UTC 2009


--- Comment #38 from Robert Knight <robertknight gmail com>  2009-06-09 00:35:36 ---
> Michale, have you measured the performance impact of your patch?
> Konsole is known to be the fastest X terminal emulator application
> and I hope it will remain so.

Fast in what way?  The traditional test of a terminal is 'how long does it take
to print X lines'.  This has some use in terms of measuring the throughput of
the back-end code but it doesn't make that much difference in day to day work. 
Both Konsole and gnome-terminal 'cheat' to do well in this by not drawing every
line of the output but if a lot of output is received in succession then the
updates are buffered and in the end only four or so re-draws of the screen are
done in a second.  xterm by comparison appears to be a lot slower if you do
this even though it can actually render the whole window much quicker because
of the simple text rendering.

Other than keeping reviewers who want to benchmark Konsole happy, the one
genuine reason to worry about 'printing X lines quickly' speed is not slowing
down an application too much if it happens to spew large amounts of output to
the terminal.

For me the thing that really matters is having quick tab/screen switching and
smooth scrolling even when the window is large.

> User time to print 3x500k lines in 3 tabs (with a 30k lines history):
> - old: 20.74s
> - new: 21.62s

That's fine by me given the memory reductions.

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