Re: [Libmesh-users] how to read a distributed mesh

[Jahrul A. <al...@mu...>]

First, I wrote the mesh as     [CheckpointIO(mymesh).write("test.cp");]

Next, I re-compiled the code (only to change 'read' to 'write'), and read
the mesh as     [CheckpointIO(mymesh).read("test.cp");]

mymesh.print_info() shows n_nodes=33153, n_local_nodes = 4225,
n_partitions=8, n_processors=8 before it was written. However, I get
n_nodes = 4225 and n_local_nodes = 4225, n_partitions=1, n_processors=8
afterwards.

Am I missing something?





On Mon, Dec 11, 2017 at 8:35 AM, Roy Stogner <roy...@ic...>
wrote:

>
> On Sat, 9 Dec 2017, Jahrul Alam wrote:
>
> Nemesis IO reads the mesh in parallel (not the solution); however,
>> the reader destroys the multi-level structure of the mesh. Is there
>> a work around to handle this problem?
>>
>
> I'm afraid not; not even ExodusII ("serial Nemesis") lets us store AMR
> structure.  IIRC when we tried the result was awful on visualization
> programs, which would try to display the inactive elements too and
> naturally show garbage.  https://en.wikipedia.org/wiki/Z-fighting
>
> For archival of AMR meshes our only good solution right now is
> serialized Xdr, I believe.  If that's a performance problem, you could
> output CheckpointIO during your simulation runs, then postprocess
> convert to Xdr later.  At some point we'll also make CheckpointIO a
> first-class format with forwards compatibility, but that's a pain to
> maintain while the format is still in flux so it won't happen soon.
>
> ---
> Roy
>
> ------------------------------------------------------------
> ------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> _______________________________________________
> Libmesh-users mailing list
> Lib...@li...
> https://lists.sourceforge.net/lists/listinfo/libmesh-users
>



-- 
=====================================
Jahrul Alam, PhD
Assistant Professor, Dept of Mathematics and Statistics
Memorial University, St John's, NL, Canada
http://www.math.mun.ca/~alamj/
eMail: al...@mu...
Office: HH-3035, Tel: 709-737 8071
=====================================