Xephyr

Xephyr is display server software implementing the X11 display server protocol based on KDrive which targets a window on a host X Server as its framebuffer. It is written by Matthew Allum. Xephyr is an X-on-X implementation and runs on X.Org Server and can work with Glamor.[2] Future versions could make use of libinput. Replacing Xephyr with the xf86-video-dummy and xf86-video-nested drivers in the normal X.Org server is being considered as part of X11R7.8.[3]

Xephyr
Three recursive levels of nested Xephyr sessions, running on Linux Mint
Original author(s)Matthew Allum
Developer(s)freedesktop.org
Initial releaseJanuary 1, 2007 (2007-01-01)
Stable release1.19.1 (January 11, 2017 (2017-01-11)[1]) [±]
Written inC
TypeDisplay server
LicenseMIT License
Websitefreedesktop.org/wiki/Software/Xephyr/

Features

Unlike the similar Xnest, Xephyr supports modern X extensions (even if host server doesn't) such as composite, damage, randr, etc. It uses SHM images and shadow framebuffer updates to provide good performance. It also has a visual debugging mode for observing screen updates.

Limitations

Xorg's version of Xephyr uses only software rendering for OpenGL, but Feng Haitao has developed a forked version of Xephyr which can do hardware-accelerated rendering if the underlying X server has the capability.

gollark: Easier than somehow interfacing with everyone's brain.
gollark: Programming languages are optimised for computers, and if it can build and maintain nuclear reactors I'm sure it can do that too.
gollark: Yes, but they operate at something like 10Hz and you couldn't just temporarily retask them without breaking things horribly.
gollark: Offloading computing to humans sounds tricky and inefficient.
gollark: What is the APL command for "build nuclear reactor"?

See also

References
  1. https://lists.x.org/archives/xorg-announce/2017-January/002754.html
  2. "ANNOUNCE: xorg-server 1.16.0". freedesktop.org. 2014-07-17.
  3. Larabel, Michael (June 16, 2012). "X.Org 7.8 Will Not Come For A While". Phoronix. Retrieved February 11, 2015.
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