Hi Andreas and All,
I finally get around and try the parallel impelmentation. The compiling part is
very straightforward. However, when I run it (e.g., boxmodels/test_1p), it
appears that the grid need to be somehow partitioned in order for the code to
work in parallel. Do we have any documentation on how to achieve this?
One test, boxmodels/test_2p2cni, appears to be running in parallel (two
processors I specified are both 100% busy), however, it appears to be in an
infinite loop, dumping a lot of data on the disk but complaining iterative
solver not converging.
Do we have an example that will run correctly in parallel?
Also, are there any improvement on the latest release 2.1?
Sorry about all the questions but I am a newbie to this fairly complex system.
Thanks for your attention and help.
-Shawn
From: Shawn Zhang <[email protected]>
To: Andreas Lauser <[email protected]>; DuMuX User Forum
<[email protected]>
Sent: Thursday, February 16, 2012 11:07 AM
Subject: Re: [DuMuX] Parallel execution of Dumux examples
Hi Andreas,
Thanks a lot for your attention and valuble instruction.
To make sure I understand the process, I would like to have one quick
clarification. The parallel capability does not require any modification of
code at the Dumux application level, is this correct? In another world, domain
decomposition and other parallel specific tasks are handled in a way that is
transparently to application code, right?
Best regards,
-Shanw
From: Andreas Lauser <[email protected]>
To: Shawn Zhang <[email protected]>; DuMuX User Forum
<[email protected]>
Sent: Thursday, February 16, 2012 9:24 AM
Subject: Re: [DuMuX] Parallel execution of Dumux examples
Hi Shawn,
First, some caveats: the parallel solvers in Dumux are currently still
experimental, and may eat kids. (i.e. they may lead to invalid results,
simulation aborts or they may be slower than the sequential solvers.) The
problem with them is that the linear solvers provided by DUNE-ISTL don't work
to well in parallel yet. If you want to give it a try anyway, read on and send
us your patches!
To use Dumux with MPI, you first have to install an MPI library with the header
files on your machine. (personally, I use openmpi 1.4.5, but it also there are
rumors that it also works with other MPI implementations like MPIch2.)
Then, you need to compile DUNE and Dumux with the configure option --enable-
parallel (usually you specify this by means of an .opts file for dunecontrol):
./dune-common/bin/dunecontrol --opts=$YOUR_OPTS_FILE --module=dumux all
then, you need to compile the Dumux application, you want to run in parallel.
For the two-phase example this is achieved by
cd dumux/test/boxmodels/2p
make check
and finally you have to execute the resulting binary using mpirun:
mpirun -np $NUM_PROCESSORS ./test_2p $OPTIONS_LIKE_FOR_SEQUENTIAL_RUN
Note, that if you need non-cartesian grids for you simulation, you should also
install ALUgrid, see
http://aam.mathematik.uni-freiburg.de/IAM/Research/alugrid/
for details.
Since the Dumux SVN repository currently is in hard feature freeze to prepare
for the next release, we would appreciate if you report your experience if you
intend to use the latest SVN version.
good luck and have fun
Andreas
On Dienstag, 14. Februar 2012 you wrote:
> Dear Dumux Developers,
>
> I want to run my Dumux programs in parallel on a multi-core workstation. As
> an example, I want to test run the tutorial_coupled example in parallel
> mode.
> Can you kindly provide me some pointers to documents or codes in order to
> implement this? Any suggestion will be truly appreciated, as I am fairly
> new to the Dumux environment.
> Thank you very much for your attention.
>
> -Shawn
> +1-978-494-3016
--
Andreas Lauser
Department of Hydromechanics and Modelling of Hydrosystems
University of Stuttgart
Pfaffenwaldring 61
D-70569 Stuttgart
Phone: (+49) 711 685-64719
Fax: (+49) 711 685-60430
www.hydrosys.uni-stuttgart.de
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