graphic dump on cluster

[Satish Balay]

Its hard to get this working properly on a cluster.

One way to do this is:

- ssh to each node [where the job will be run] so that
  there exists a X11 tunnel from  all nodes
- make sure all of them have the same ssh-x11 display. i.e
  once you ssh - check with 'echo $DISPLAY'
- now run the PETSc binary with this display value..

Satish

On Wed, 24 Jan 2007, Barry Smith wrote:

> 
>   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
> > 
> > 
> 
>