Creation mfem::Mesh from gpu buffers

[moroz3339]

Hello everyone!
I construct a mesh as a list of triangles on a CUDA and next I must transfer it to Host for mfem::Mesh constructing, it seems wasteful because as the backend of MFEM, I use CUDA. So, is there any possibility of passing the CUDA pointer to GPU buffers of vertices, indices etc, for creating MFEM mesh?
Thanks!

[v-dobrev]

Hello,

Currently, almost all mfem::Mesh data lives on the CPU and almost all of its methods are executed on CPU even when using MFEM's cuda backend. One exception is the computation of the geometric factors in Mesh::GetGeometricFactors and Mesh::GetFaceGeometricFactors which is performed on GPU (when using a GPU backend). Basically, even if your mesh data is available directly on the GPU, we'll need to copy it to the CPU to construct the respective mfem::Mesh object.

In most cases, the main computational cost is not in the Mesh class, so we have not focused on porting more methods to the GPU, at least for now.