<div>Hi Stephane,</div><div><br></div><div>Although this has not been widely advertised, here at Utah, we have been working with Sandia and Kitware on this. The code is already in the main VTK repository, but we are lacking a set of examples that show how to best use the new functionality. </div>
<div><br></div><div>For now, I can point you to a preprint (not final) of the technical paper:</div><div><br></div><div>Streaming-Enabled Parallel Dataflow Architecture for Multicore Systems, Huy T. Vo, Daniel K. Osmari, Brian Summa, Joao L. D. Comba, Valerio Pascucci, and Claudio T. Silva, Computer Graphics Forum (Proceedings of EuroVis 2010), to appear. </div>
<div><div><a href="http://www.sci.utah.edu/~csilva/papers/eurovis2010-notfinal.pdf">http://www.sci.utah.edu/~csilva/papers/eurovis2010-notfinal.pdf</a></div><div><br></div><div>Over summer, we (Utah, Sandia, Kitware) plan to write a tutorial with a good number of examples. Also, the work has been extended to support heterogenous nodes (CPU and GPU), but that work is not ready yet to be submitted to the VTK repository.</div>
<div><br></div><div>I am not sure if this completely addresses your concerns, but hopefully it is a step in the right direction.</div><div><br></div><div>Best regards,</div><div><br></div><div>Claudio.</div><div><br></div>
<div><br></div></div><br><br><div class="gmail_quote">On Fri, Apr 2, 2010 at 7:49 AM, Stephane PLOIX <span dir="ltr"><<a href="mailto:stephane.ploix@edf.fr">stephane.ploix@edf.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<br><font size="2" face="sans-serif">Hi ARB,</font>
<br>
<br><font size="2" face="sans-serif">Another topic that could also be of
interest : multi-threading. </font>
<br><font size="2" face="sans-serif">I will not elaborate on the why (multi-cores)
of this question and on the potential unefficiency (memory bound algorithms)
of it, I believe it is a subject on which VTK should have a clear policy
/ roadmap.</font>
<br><font size="2" face="sans-serif">I know this is a huge task, but could
we try to take the first steps :</font>
<br><font size="2" face="sans-serif">*maybe justify why VTK will never be
multi-threaded and be clear about it.</font>
<br><font size="2" face="sans-serif">*If not, I believe the first step is
to make the methods reentrant (including iterators as listed in the topics
for the next arb meeting, removing static variables...)</font>
<br><font size="2" face="sans-serif">*An then in any order, support different
kind of multithreading : </font>
<br><font size="2" face="sans-serif">**inter-algorithm (update several filter
together when there is no dependency in the pipeline),</font>
<br><font size="2" face="sans-serif">**inter-block (when an algorithm loops
over multiple independent blocks, there is potential for multi-threading),</font>
<br><font size="2" face="sans-serif">**intra-algorithm (algorithm-dependent).</font>
<br>
<br><font size="2" face="sans-serif">Some (or all?) of these topics have
already recieved attention and some have partial solutions (vtkMultiThreader...),
but I have not seen any clear roadmap on this subject.</font>
<br>
<br><font size="2" face="sans-serif">Best,</font>
<br><font size="2" face="sans-serif">Stephane<br>
</font>
<br>
<br>
<br>
<p></p><table width="100%">
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<td width="40%"><font size="1" face="sans-serif"><b><a href="mailto:jeff.baumes@kitware.com" target="_blank">jeff.baumes@kitware.com</a></b>
</font>
<br><font size="1" face="sans-serif">Envoyé par : <a href="mailto:vtk-developers-bounces@vtk.org" target="_blank">vtk-developers-bounces@vtk.org</a></font>
<p><font size="1" face="sans-serif">01/04/2010 21:36</font>
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<div align="right"><font size="1" face="sans-serif">A</font></div>
</td><td><font size="1" face="sans-serif"><a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a>, <a href="mailto:vtk-developers@vtk.org" target="_blank">vtk-developers@vtk.org</a></font>
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<div align="right"><font size="1" face="sans-serif">cc</font></div>
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<td>
<div align="right"><font size="1" face="sans-serif">Objet</font></div>
</td><td><font size="1" face="sans-serif">[vtk-developers] ARB</font></td></tr></tbody></table>
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<br><tt><font size="2">VTK community,<br>
<br>
I just wanted to take the opportunity to tell you about what has been<br>
happening with the VTK ARB (architecture review board). The ARB was<br>
formed last year to facilitate forward progress in VTK. It is a task<br>
force consisting of researchers around the world that was formed to<br>
work out the details required to make important changes, such as<br>
release schedules and moving to git repository. The ARB wants your<br>
input, and wants to be transparent about its discussions and<br>
decisions. A page describing the ARB is located at<br>
<br>
<a href="http://www.vtk.org/Wiki/VTK/ARB" target="_blank">http://www.vtk.org/Wiki/VTK/ARB</a><br>
<br>
Scheduled meetings and meeting notes are located at<br>
<br>
<a href="http://www.vtk.org/Wiki/VTK/ARB/Meetings" target="_blank">http://www.vtk.org/Wiki/VTK/ARB/Meetings</a><br>
<br>
Jeff<br>
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