Xnest vs. Xephyr? What Are the Differences?

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Xnest vs. Xephyr? What Are the Differences?

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Xnest vs. Xephyr? What Are the Differences?

I've been using Xnest extensively for the past eight years for various purposes. However, just this morning while looking through some old bookmarks and following one of them to a Debian forum, I saw someone mention Xephyr. Apparently it's some kind of X server that runs on top of an existing X server. Just like Xnest... The only differences (and they're pretty major) I can see are that Xephyr supports composite, render, xrandr with the only thing missing being GL stuff.

The application that people were mentioning in this forum was to replace multiXnest which, I guess, allows multiple users to access individual screens on one machine simultaneously. But I'm not sure exactly what they mean. It seems the letting multiple people use nested X servers on one server doesn't really sound all that usable other than in a training environment where users and instructors need to interact. Or am I missing something?

On the other hand, if Xephyr would allow for one giant X server with multiple screens that could be connected to from anywhere, anytime and allow for applications to be moved between desktops so that users could pass processes around, that would be quite wonderful. Is this what Xephyr might offer?

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LEARN ABOUT OSX

xephyr

Xephyr(1)						      General Commands Manual							 Xephyr(1)

NAME

       Xephyr - X server outputting to a window on a pre-existing X display

SYNOPSIS

       Xephyr [:display] [option ...]

DESCRIPTION

       Xephyr  is a kdrive server that outputs to a window on a pre-existing "host" X display.	Think Xnest but with support for modern extensions
       like composite, damage and randr.

       Unlike Xnest which is an X proxy, i.e.  limited to the capabilities of the host X server, Xephyr is a real X server which uses the  host  X
       server window as "framebuffer" via fast SHM XImages.

       It also has support for "visually" debugging what the server is painting.

OPTIONS

       The server accepts all the standard options of Xserver(1) and the following additional options:

       -screen widthxheight
	       sets the screen size.

       -parent id
	       uses exiting window id .  If a -screen argument follows a -parent argument, this screen is embedded into the given window.

       -host-cursor
	       set  'cursor  acceleration':  The host's cursor is reused. This is only really there to aid debugging by avoiding server paints for
	       the cursor. Performance improvement is negligible.

SIGNALS

       Send a SIGUSR1 to the server (e.g. pkill -USR1 Xephyr) to toggle the debugging mode.  In this mode red rectangles  are  painted	to  screen
       areas  getting  painted	before	painting the actual content.  The delay between this can be altered by setting a XEPHYR_PAUSE env var to a
       value in micro seconds.

CAVEATS

       o Rotated displays are currently updated via full blits. This is slower than a normal orientated display. Debug mode will therefore not	be
	 of much use rotated.

       o The '-host-cursor' cursor is static in its appearance.

       o The  build  gets a warning about 'nanosleep'. I think the various '-D' build flags are causing this. I haven't figured as yet how to work
	 round it. It doesn't appear to break anything however.

       o Keyboard handling is basic but works.

       o Mouse button 5 probably won't work.

SEE ALSO

       X(7), Xserver(1)

AUTHOR

       Matthew Allum <mallum@o-hand.com> 2004

X Version 11							xorg-server 1.12.4							 Xephyr(1)