Hello,
First, the CGNS reader coming through the VisItBridge is not working in parallel, it's a plain serial reader. Second, there are limitations to the current cgns reader way of doing thing, since : - At the beginning, it parses the whole file (this takes a lot of time) to get variable names, blocks and so on, before actually reading the data. [ I think that tecplot is cleaner because it seems to read the whole CGNS file in one pass ] - meshes are read in a temporary array and converted to a VTK vector of coordinates (thus memory manipulation) - for unstructured meshes, convertion from 'integer' to 'long' of cells connectivity eats memory. The CGNS reader can improve but at the cost of redesining some parts to fit better in paraview and go for parallel.
Mickael On 29/08/2013 16:50, Angelini, Richard C (Rick) CIV USARMY ARL (US) wrote:
As a followup to this that may be related - does the CGNS reader through the VisItBridge work in parallel? I've loaded up a couple of different CGNS datasets and then applied the ProcessIDScalars filter and it doesn't appear to be distributing the data - even multi-block CGNS files. ________________________________ Rick Angelini USArmy Research Laboratory CISD/HPC Architectures Team Building 120 Cube 315 Phone: 410-278-6266 ________________________________________ From: paraview-boun...@paraview.org [paraview-boun...@paraview.org] on behalf of Richard GRENON [richard.gre...@onera.fr] Sent: Thursday, August 29, 2013 10:38 AM To: paraview@paraview.org Subject: [Paraview] Performance of the CGNS Reader Hello. I am testing the CGNS reader of Paraview 4.0.1 64 bits running on a Linux Workstation having 4 CPUs and 5.8 Gbytes of memory. Paraview was installed from the binaries available on the download page. I am trying to load a 1.36 Gbytes CGNS file that is available through the network. While loading this file, the Paraview Windows is frozen and cannot be refreshed, and I must check with the "ps" command on a terminal window or with a system monitor if PV is still running or if it is really frozen. A progress bar for all readers would be welcome in a next release. Finally, the file can be loaded, but it always takes about 15 mn (+ or - 1 mn depending of the load of the network), while Tecplot always loads the same file within less that 1 mn ! How do you explain this poor performance of the CGNS reader ? Can it be improved, or am I missing something ? Is there some Paraview option that could reduce loading time of large files ? Best regards -- Richard GRENON ONERA Departement d'Aerodynamique Appliquee - DAAP/ACI 8 rue des Vertugadins 92190 MEUDON - FRANCE phone : +33 1 46 73 42 17 fax : +33 1 46 73 41 46 mailto:richard.gre...@onera.fr http://www.onera.fr _______________________________________________ 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 _______________________________________________ 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
_______________________________________________ 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
