Dear Utkarsh, I am also interested in the visualization of big data. You wrote that the XML VTK reader only reads portion relevant to the parallel process. Is this also true for unstructured data? And is there any limitation in the size of the data for XML VTK? I remember that there are 32 bit pointers in the XML VTK files. Is this still true? If yes, we would have a limitation of 4 GB.
Thanks, Herwig Am 06.03.2013 19:41, schrieb Utkarsh Ayachit:
Patrick, With legacy VTK format, ParaView does the following: 1. for unstructured data (vtkPolyData, vtkUnstructuredGrid etc), ParaView reads the entire file on the root node and then partitions and distributes the data among all processes so the rest of the processing i.e. filters, etc. can distribute the work across processes. 2. for image data and other structured data, however, ParaView reads the entire file on all processes and then "crops" the data to a subset to distribute further processing between processes. This is lame and we are going to change this in near future to do something similar to what we do for unstructured data. Note this is specific to legacy VTK files. If you write out a XML VTK file (vti) then ParaView smartly reads only the portions relevant to the process in parallel. Hopefully, that clarifies things a bit. Utkarsh
------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Sebastian M. Schmidt ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ _______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview
