ParaView/ParaView Readers and Parallel Data Distribution

Under Development. Editors, try to keep this list sorted by the extension

File Extension	Format Description	Reader	Notes on Data Parallelism	Time Support
*.ex2,.exo	Exodus Files	ExodusII reader	This file format supports parallel distribution of data by splitting data across many files. It also supports mesh adaptation by splitting files at simulation times where adaptation occurs. Hence ParaView does the following: The root node scans the directory for files in the set and reads metadata (blocks and variables defined on them) from a single file in the set. It then broadcasts this information to all processes. Each reads a different subset of files.	Time steps may be contained in a file as long as the mesh topology does not change. Time may also be split across a file series.
*.vtk	Legacy VTK Files	Legacy VTK reader	This file format has no support for saving parallel distribution of data. Hence ParaView does the following: Structured Data For structured data, this reader reads the entire file on all processes and then crops the structured extents on each process so that for each process, the filters downstream process a block of the structured data alone. Unstructured Data The root node reads the entire file and then the data is distributed to all processes (using MPI) after an internal, fairly naive, partitioning algorithm (vtkTransmitUnstructuredGridPiece or vtkTransmitPolyDataPiece).	Time supported only as a file series.