[Paraview] Re: MPI makes Paraview slower?

[Nancy]

Bryan,
Slower or faster is decided by the data type. Only
regular types of data (structured grid or image data)
can be divided into sub-grids automatically by paraview
when running in parallel mode.
For unstructured data (poly data or unstructured grid)
the distribution should be done by users. Or, you can use
D3 filter on your data, which can redistribute your data
on the parallel system evenly.

Our lab aslo is testing the parallel performance of paraview,
could you tell me what is format of your data? and is it could
be shared with us?

Nancy


>
>hi,
>
>i am (a major newbie) running paraview in 
>parallel mode with mpich2 (1.0.3) on a 2 
>dual-core cpu machine using this:
>
>mpiexec -n 4 /usr/local/paraview2.5/bin/paraview/
>
>and many things seem slower than just running 
>paraview in single cpu mode.  one of the trivial 
>things that is noticably MUCH slower is simply 
>loading a file: i have a 500MB file that takes 
>about 5 seconds to load in single cpu mode, and 
>takes about 30-40 seconds when running in MPI.  
>also, no matter if i run in single or MPI, the 
>slowest process that i have seen so far 
>(PainterPolyDataMapper) only uses a single cpu.  
>i am sure there is just something i am doing 
>wrong.  any hints on how (if!?) i can change 
>this behaviour?  i have ordered the book but it 
>has not yet arrived...
>
>thanks,
>bryan
>
>W. Bryan Smith
>UCSD/NCMIR
>9500 Gilman Drive # 0608
>La Jolla, CA, 92093-0608
>
>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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