[Paraview] catalyst with parallel rendering

[Andy Bauer]

Hi Mark,

With Catalyst you only connect the running simulation to a pvserver if
you're using ParaView Live to do a connection from the GUI to the
simulation.

If you're running Catalyst in "batch" the in situ operations are done in
the same process space as the simulation and no pvserver process is needed.

Best,
Andy


On Fri, Jun 1, 2018 at 11:16 AM Mark Olesen <Mark.Olesen at esi-group.com>
wrote:

> Hi Andy,
>
> Welcome back from hols!
>
> This actually missed the question.
>
> I assume that we get whatever pvserver up and running in parallel
> (generally have indeed used a pvserver build with mesa and llvmpipe
> rendering), how do we attach to it from catalyst?
>
> Using a GUI "connect" button seems pointless/self-defeating, but how can
> I convey to catalyst that I'd like to connect to a particular server?
>
> Cheers,
>
> /mark
>
> On 06/01/18 16:56, Andy Bauer wrote:
> > Hi Mark,
> >
> > If you want to create images from Catalyst runs you'll probably want to
> > build the ParaView that you're linking to with either OSMesa or EGL (and
> > Qt disabled). This gets around needing the X context for rendering since
> > I believe running with offscreen enabled is not sufficient. EGL comes
> > with most of the NVIDIA drivers -- see
> >
> https://blog.kitware.com/off-screen-rendering-through-the-native-platform-interface-egl/
> > for how to build PV with it. If you want to go the OSMesa route I'd
> > recommend using the ParaView superbuild
> > (https://gitlab.kitware.com/paraview/paraview-superbuild) to build it
> > for you.
> >
> > Does this answer your question? I just got back from vacation and am
> > trying to catch up on more things than my brain can currently handle so
> > let me know if you have more questions.
> >
> > Best,
> > Andy
> >
> >
> >
> > On Mon, May 28, 2018 at 11:25 AM Mark Olesen <Mark.Olesen at esi-group.com
> > <mailto:Mark.Olesen at esi-group.com>> wrote:
> >
> >     For the mailing list, since this must probably be a FAQ (even if I
> seem
> >     to find the answer in the usual places).
> >
> >     I would like to have paraview rendering in parallel for a simulation
> >     with catalyst. For simplicity, I'm fiddling about on a local
> >     workstation, but would like to generalize later. it should work
> without
> >     live visualization enabled, or requiring a GUI to connect.
> >
> >     I'd presume using something like the following
> >
> >     mpirun -np 12 pvserver --server-port=123456
> --force-offscreen-rendering
> >
> >     would be setup a parallel rendering session as usual. However, after
> >     scouring docs there doesn't seem to be an obvious way to connect this
> >     within catalyst (without a GUI).
> >
> >     The only access point that I seem to find is to define an MPI
> >     communicator for initializing catalyst after some how (some
> hand-waving
> >     here) querying a pvserver connection for its host topology and
> defining
> >     an appropriate communicator.
> >
> >     Cheers,
> >
> >     /mark
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> --
> Dr Mark OLESEN
> Principal Engineer, ESI-OpenCFD
> ESI GmbH | Einsteinring 24 | 85609 Munich | GERMANY
> Mob. +49 171 9710 149
> www.openfoam.com | www.esi-group.com | mark.olesen at esi-group.com
>
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