[torqueusers] X forwarding in torque very slow (qsub -X)
gabe at msi.umn.edu
Wed Mar 30 14:02:11 MDT 2011
On Wed, Mar 30, 2011 at 06:10:14PM +0200, Brunet Pierre-Marie wrote:
> Hi there,
> I'm facing a strange problem when I launch an interactive job with X11
> forwarding "qsub -X -I" :
> When I use a GUI, it runs much more slowly than the same GUI opened in a
> "ssh -X" context.
> Client PC ==ssh -X==> Torque client (front node) ==ssh -X==> cluster
> node : OK
> Client PC ==ssh -X==> Torque client (front node) ==qsub -X -I==> cluster
> node : NOK
> For example, the menu in Matlab is very jerky but I don't have this
> problem when I'm connected to the node throught ssh -X.
> "qsub -X -I" seems to add a lot of latency in the loop.
> The configuration is :
> - OS = RedHat5 (server and nodes)
> - Torque = 2.4.11
I'll second this report; we're also seeing it. We're also running 2.4.11,
but haven't tested with any other versions. Specific apps where we see a
marked difference are Avizo and Ansys. I'm suspecting that some apps will
perform better than others when using qsub -X. For example, with Matlab
and Tecplot, we see very little difference in responsiveness, if any,
between qsub -X and ssh -X.
Gabe Turner gabe at msi.umn.edu
HPC Systems Administrator,
University of Minnesota
Supercomputing Institute http://www.msi.umn.edu
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