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Update changelog and add some performance comparisons

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Kovid Goyal 2017-10-10 09:21:42 +05:30
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19
CHANGELOG.rst
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@ -4,12 +4,21 @@ Changelog
version 0.4.0 [future]
-----------------------
- Refactor kitty's internals to make it even faster and more efficient. The
CPU usage of kitty + X server while doing intensive tasks such as scrolling
a file continuously in less has been reduced by 50%. There are now two
- Support for drawing arbitrary raster graphics (images) in the terminal via a
new graphics protocol. kitty can draw images with full 32-bit color over both
ssh connections and files/shared memory (when available) for better
performance. The drawing primitives support alpha blending and z-index.
Images can be draw both above and below text. See
https://github.com/kovidgoyal/kitty/blob/master/graphics-protocol.asciidoc
for details.
- Refactor kitty's internals to make it even faster and more efficient. The CPU
usage of kitty + X server while doing intensive tasks such as scrolling a
file continuously in less has been reduced by 50%. There are now two
configuration options ``repaint_delay`` and ``input_delay`` you can use to
fine tune kitty's performance vs CPU usage profile. The CPU usage of kitty
+ X when scrolling in less is now better than most (all?) other terminals.
fine tune kitty's performance vs CPU usage profile. The CPU usage of kitty +
X when scrolling in less is now significantly better than most (all?) other
terminals. See https://github.com/kovidgoyal/kitty#performance
- Hovering over URLs with the mouse now underlines them to indicate they
can be clicked. Hold down Ctrl+Shift while clicking to open the URL.

23
README.asciidoc
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@ -316,6 +316,29 @@ that and perform the task you want to analyse, for example, scrolling a large
file with `less`. After you quit, function call statistics will be printed to
`stdout` and you can use tools like *kcachegrind* for more detailed analysis.
Here are some CPU usage numbers for the task of scrolling a file continuously in less.
The CPU usage is for the terminal process and X together and is measured using htop.
The measurements are taken at the same font and window size for all terminals on a
`Intel(R) Core(TM) i7-4820K CPU @ 3.70GHz` CPU with a
`Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde XT [Radeon HD 7770/8760 / R7 250X]` GPU.
|===
| Terminal | CPU usage (X + terminal)
| kitty | 6 - 8%
| xterm | 5 - 7% (but scrolling was extremely janky)
| termite | 10 - 13%
| urxvt | 12 - 14%
| gnome-terminal | 15 - 17%
| konsole | 29 - 31%
|===
As you can see, kitty uses much less CPU than all terminals, except xterm, but
its scrolling "smoothness" is much better than that of xterm (at least to my,
admittedly biased, eyes).
== Note for Linux/macOS packagers
While kitty does use python, it is not a traditional python package, so please do not install it in site-packages.