Just to make sure, your ParaView is built with MPI support enabled, right? XMLMultiBlockDataReader does distribute the blocks to read among the processes. Try apply a "ProcessIdScalars" filter in the middle and then look at the ProcessId assigned to the blocks in the data. They should show how the blocks were distributed.
Utkarsh On Tue, Jan 15, 2013 at 7:20 AM, Yves Rogez <[email protected]> wrote: > Hello, > > I'm trying to parallelize a process using pvbatch and MPI, with MultiBlock > data set; thus using the vtk composite pipeline. > I made a sample python program that is representative of what I have to do : > > -------------------------------------------------------------------------------------------------- > > from paraview.simple import * > > r = servermanager.sources.XMLMultiBlockDataReader() > r.FileName = "input.vtm" > > # Defining a sample fake data processing > nbTs = 1000 > ts = {} > for tIndex in range( 0, nbTs ): > ts[tIndex] = servermanager.filters.Transform() > if tIndex == 0: > ts[tIndex].Input = r > else: > ts[tIndex].Input = ts[tIndex - 1] > ts[tIndex].Transform.Scale = [1.01,1.01,1.01] > > w = servermanager.writers.XMLMultiBlockDataWriter() > w.Input = ts[nbTs - 1] > w.FileName = "output.vtm" > > w.UpdatePipeline() > > -------------------------------------------------------------------------------------------------- > > I launch that using "mpiexec -np 4 pvbatch myscript.py" > All run well but I get a longer time using MPI than using only "pvbatch > myscript.py". > > By monitoring RAM, I noticed that it seems the data is loaded on time by MPI > process, and (maybe) all the MPI processes do exactly the same job, > computing four times all the data. > > Why my blocks in MultiBlock data set aren't dispatched over the MPI > processes ? > What am I doing wrong ? > > Many thanks for any help, > > Yves > > _______________________________________________ > 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
