I successfully created a privileged lxc archlinux container
on an archlinux host with lxc. I set up a static ip via dnsmasq and ssh into it and I use xauth
to forward X11
. I then call programs like mupdf
or plot functions from programming languages such as R
or Matlab
. While this all works fine I constantly see error messages printed to the console when I open a *.pdf
file with mupdf
:
ximage: disabling shared memory extension: BadAccess (attempt to access private resource denied)
Two short questions about this:
- What exactly does this error message mean?
- How can this error be solved (or is it safe to ignore)?
Best Answer
Shared memory is a mechanism to exchange rendered image without having to use sockets, the protocol works something like this: X client create the shared buffer, X client tell the server
that's where you will find the images i create
, the server "attach" itself to the shared memory and refresh whenever there is an update, this mechanism offers 10x the speed of socket transfer, but slower than zero-copy rendering. if you wish you can disable this mechanism by setting these environment variables: