How to visualize a matrix object from a remote machine?

[Satish Balay]

If you are running on a cluster - the cluster nodes won't usually have
access to the X11-server-port on the front-end node.

So - its best to do '-mat_view_draw' on a non-cluster environment.

If you really need to do this on the cluster - the following methods
are possible:

1) assuming you know the host-file before invoking the 'mpirun'
command [which appears to be the case here ]- you would do:

- establish an ssh-x11 tunnel into node1 [in the node-file list]
'ssh -Y node1'
- find out the display value for this tunnel
echo $DISPLAY
- now use this value with 'mpirun binary -mat_view_draw -draw_pause -1 -display display_value'

Note: If there are seq matrices created in your solve - you might need
ssh-x11 tunnels to *all* the nodes [and hope you get the same
'localhost:10' value on all of them]

2. Open up a x11-tcp port on the cluster-front-end - but for that -
you need to be root on that machine - or convice your sys-admin this
is a safe thing to do. [this can be limited to ssh-x11-forwared port
by modifying the sshd_config i.e - enable GatewayPorts]


Satish

On Tue, 15 Dec 2009, hxie at umn.edu wrote:

> 
> 
> Following your instruction, I got the error message:
> 
> X connection to localhost:15.0 broken (explicit kill or server shutdown).
> 
> mpirun_ssh -timeout 200 -paramfile paramfile.6617 -np 4 -hostfile hosts
> /home/bc2/xieh2/bin/cats3d.1 -mat_view_draw -draw_pause -1 -display
> localhost:15.0 failed!
> 
> 
> 
> > 
> > Message: 3
> > Date: Tue, 15 Dec 2009 10:57:53 -0600 (CST)
> > From: Satish Balay <balay at mcs.anl.gov>
> > Subject: Re: How to visualize a matrix object from a remote machine?
> > To: PETSc users list <petsc-users at mcs.anl.gov>
> > Message-ID: <alpine.LFD.2.00.0912151056190.20137 at asterix>
> > Content-Type: TEXT/PLAIN; charset=US-ASCII
> > 
> > On Tue, 15 Dec 2009, hxie at umn.edu wrote:
> > 
> > > Hi,
> > > 
> > > I use X11 to connect the server and I want to draw the nonzero structure
> > > of
> > > matrix. The option '-mat_view_draw' gives some error messages. How to fix
> > > it?
> > > Thanks.
> > 
> > What error message?
> > 
> > 
> > Normally you can do the following:
> > 
> > 
> > ssh -Y remotemachine
> > 
> > <on remote machine>
> > ./petscbinary -mat_view_draw -draw_pause -1
> > 
> > or
> > 
> > ./petscbinary -mat_view_draw -draw_pause -1 -display $DISPLAY
> > 
> > Satish
> > 
> > 
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