[vtkusers] Re: Offscreen Rendering

[Miguel Angel Martin Fernandez]

Hi again,


The machine <name_of_R> is the name of the host that started the MPI job,
therefore I understand now that all the displays are being opened on this
machine (one display per processor). However, when i try to open the
displays on the local machines:
 
  XOpenDisplay(":0"), XOpenDisplay("<name_of_localhost>:0.0"),...  

	then i always get the "invalid MIT-MAGIC-COOKIE key, connection
refused by server" message. 

Is it possible to fix this?  Should I use "xauth"? As i said yesterday,
opening the display ":0" works OK as long as i have a local X session
opened on each of the machines (i.e. if I can see my desktop on each
computer...)

Thank you!

  



On Wed, 3 Oct 2001, John Shalf wrote:

> Miguel Angel Martin Fernandez wrote:
> > 
> > Hello vtkusers!
> > 
> > The script "run.sh" does work if i am actually running the program via
> > telnet, as long as i have 'XOpenDisplay((char *)NULL)' in my
> > vtkOpenGLOffscreenRenderWindow, that way XOpenDisplay defaults to the
> > value of the DISPLAY environment variable (--> i read the man page!! )
> 
> The default value of the DISPLAY variable may well be the
> host that executes the program.  So that would mean all of
> the rendering would be redirected to the host you'd
> telnetted from in the worst case.  Overriding with ":0"
> ensures that it is rendering on the local host (could be
> more specifically "localhost:0.0").  
> 
> > However what i am actually trying to do is parallel rendering on a
> > linux cluster with mpi, so programs are called via rsh, and with this
> > approach the script doesn't seem to work. However it did work by telling
> > XOpenDisplay exactly what display i wanted:
> > 
> >                   'XOpenDisplay("<name_of_R>:0.0")'
> 
> Is <name_of_R> the name of the machine that the local MPI
> process is executing on, or is it the name of the host that
> started the MPI job?  Some X implementations want
> "localhost:0.0" or "$hostname:0.0", but the ":0" is usually
> enough.  Seems your machine is one of the former...
> 
> -john
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  \········(_   Miguel Ángel Martín Fernández                      _)········/
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