[MOAB-dev] ghost exchange with triangles?

[Ryan O'Kuinghttons]

Hi Iulian,

After looking into this further I realize that the issue has nothing to 
do with meshes composed of triangles, I do actually get the same issue 
with quadrilaterals (my previous mail said that quads were working). In 
fact, I even see the same issue with the last test case we were 
debugging. The difference between now and then is that the previous test 
case was only calling exchange_tags with the elem_coords tag (as a 
minimal reproducer), which now works in both versions. Now I am seeing 
that every other tag on this test mesh is not being updated by the 
exchange_tags call, even though the debug code says that they are:

   1  ParallelComm(0.04 s) Unpacking tag GLOBAL_ID
   1  ParallelComm(0.04 s) Unpacking tag orig_pos
   1  ParallelComm(0.04 s) Unpacking tag owner
   1  ParallelComm(0.04 s) Done unpacking tags.

The only difference I can see between the elem_coords and the GLOBAL_ID 
or owner tags is that elem_coords is initialized as a double, and the 
others are integers. Is there some reason that a call like the following 
would not work with exchange_tags?

int int_def_val = 0;

merr=moab_mesh->tag_get_handle(GLOBAL_ID_TAG_NAME, 1, MB_TYPE_INTEGER, 
mbmp->gid_tag, MB_TAG_DENSE, &int_def_val);

Ryan

On 11/9/18 10:56, Ryan O'Kuinghttons wrote:
> Hi Iulian, I ran into an issue with the ghost element exchange this 
> week. I'm using a small test mesh with one quadrilateral, two 
> triangles and two pentagon/hexagons that are broken down into 
> triangles. The ghost exchange seems to work, but the tag exchange does 
> not. I modified the test we were using before, if you want to have a 
> look. When I plot the mesh after the exchange_tags call I see 0s at 
> the the node and element ids locations, which is strange because this 
> works just fine with a mesh of quadrilaterals. The test is on the 
> moab4 branch, at 
> esmf/src/Infrastructure/Mesh/tests/ESMC_MeshMOABGhostUTest. You should 
> call 'make distclean' before rebuilding esmf, then just "make" in test 
> directory and you can run it with:
>
> mpirun -np 4 $ESMF_DIR/tests/*/*/ESMC_MeshMOABGhostUTest
>
> I am traveling today, and I will be in and out most of the day, but 
> will check email when I can. I have a feeling this is another issue 
> with how we are setting the tags, but hopefully it's a quick fix. 
> Thanks again,
>