On Tue, Jun 12, 2018 at 7:48 PM, Povolotskyi, Mykhailo <[email protected]>
wrote:
> Dear Libmesh develepers,
>
> I want to create different instances of mesh on several MPI processes.
> Then I want to output the mesh from one MPI process.
>
>
> I am facing problems with the following code:
>
>
> #include "libmesh/libmesh.h"
> #include "libmesh/mesh_generation.h"
> #include "libmesh/mesh.h"
> int main(int argc, char ** argv)
> {
>
> MPI_Init(&argc, &argv);
>
MPI is already initialized in LibMeshInit, so no need to do this manually
unless your real code does MPI communication before LibMeshInit...
> {
> libMesh::LibMeshInit init (argc, argv,MPI_COMM_WORLD);
> libMesh::Mesh mesh(libMesh::Parallel::Communicator(MPI_COMM_SELF));
> libMesh::MeshTools::Generation::build_cube (mesh,
> 10, 10, 5, 0.0, 2.0, 0.0,
> 3.0, 0.0, 4.0,libMesh::HEX8);
>
> int rank;
> MPI_Comm_rank(MPI_COMM_WORLD, &rank);
>
Again, I'd just use init.comm().rank() to find out the rank.
>
> if (rank == 0)
> {
> mesh.write("mesh1.vtu");
> }
> }
> MPI_Finalize();
>
MPI_Finalize is called in the LibMeshInit destructor, no need to call it
manually.
> return 0;
> }
>
The problems are as follows:
>
> Problem #1) If I run the code in serial, I'm getting warning:
>
> Warning: This MeshOutput subclass only supports meshes which have been
> serialized!
> Warning: This MeshOutput subclass only supports meshes which have been
> serialized!
> The .pvtu extension should be used when writing VTK files in libMesh.
>
>
> My question:
>
> a) how to avoid the first waning about the mesh not being serialized?
>
Unless you have configured libmesh with --enable-parmesh (and therefore
Mesh == DistributedMesh) this warning can be safely ignored.
>
> b) I tried to change the filename to mesh1.pvtu
>
> In this case I'm getting an error message:
>
>
>
> ERROR: Unrecognized file extension: mesh1.pvtu
> I understand the following:
>
This is just a (possibly unnecessary) limitation of the NamebasedIO class,
it should work (as in misc_ex11 and misc_ex4 if you explicitly construct a
VTKIO object and then call the write() method.
--
John
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