[Paraview-developers] MultiBlockDataSet rendering error with parallel Paraview

[Utkarsh Ayachit]

Prashant,

> I have noted that when simulation is run in parallel mode, geometry nodes/cells are decomposed in non-uniform way. This leads to empty surfaces (vtkPolyData) on some ranks. For example, rank 0 to m may distribute all nodes among them of surface 1 leaving ranks m+1 to n with empty vtkPolyData (corresponding to surface 1). Could this affect the rendering with parallel run of paraview?

It would depend on how balanced the geometries are across all blocks.
Compositing code kicks in only after all blocks on each of the ranks
have rendered. So if your total geometry is unbalanced, the the load
heavy rank will indeed slow down the rendering process.

Utkarsh