graphic dump on cluster

[Barry Smith]

  Note that the PETSc X model has ALL nodes connect to the X server (not
just where rank == 0). Thus all of them need 
1) the correct display value (-display mymachine:0.0 is usually the best way to 
    provide it)
2) permission to access the display (X permission stuff, read up on it) and
3) a route to the X server (via TCP/IP).

  Barry


On Wed, 24 Jan 2007, Matthew Knepley wrote:

> On 1/24/07, js2615 at columbia.edu <js2615 at columbia.edu> wrote:
> > Hi Petsc experts,
> > 
> > I have a question about the graphic output using multiple
> > processors.  Suppose I am using X11 to ssh into the cluster, and
> > would like to view the graphical output at each iteration using
> > 
> > ierr = VecView(x,PETSC_VIEWER_DRAW_WORLD);CHKERRQ(ierr);
> > 
> > I got the following error message, turns out, when I use multiple
> > processors (not a problem using one processor though):
> > 
> > Unable to open display on localhost:10.0
> > .  Make sure your COMPUTE NODES are authorized to connect
> >     to this X server and either your DISPLAY variable
> >     is set or you use the -display name option
> 
>  The error message is exactly right. You either need to set the DISPLAY env
> var or give the -display option to PETSc. I think giving -Y to ssh forwards
> your
> Xconnection automatically (setting DISPLAY).
> 
>  Matt
> 
>