Dear petsc-users,

    I am having issues with output of parallel data attached to a DMPlex (or maybe more fundamental ones about DMPlex...).

So I currently

1. create a DMPlex (DMPlexCreateGmshFromFile or DMPlexCreateBoxMesh)
2. partition it
3. and create a section for my data layout with DMPlexCreateSection(ctx.dmMesh, NULL, numComp, numDof, numBC, NULL, NULL, NULL, NULL, &sUavg)
4. DMSetLocalSection(ctx.dmMesh, sUavg)
5. create solLoc and solGlob vectors with DMCreateGlobalVector and DMCreateLocalVector
6. solve ....
7. VecView(ctx.solGlob, vtkViewer) on a .vtu file
   

but when I load data in ParaView I get more cells than expected and it is as if the cells in the halo are put twice in output. (I could create a MWE if the above is not clear)

I guess that the culprit is point (4), but if I replace it with DMSetGlobalSection then I cannot create the local vector at point (5).

How should I handle this properly? In my code I need to create both local and global vectors, to perform at least GlobalToLocal and to save the global data.

(On a side note, I tried also HDF5 but then it complains about the DM not having a DS...; really, any working solution that allows data to be explored with Paraview is fine)

Thanks for any advice!

Matteo Semplice