<div>Burlen:</div>
<div> </div>
<div> The choice of RK-45 might not be able to make a big difference for your case if the bottleneck lies in other components of the whole pipeline.</div>
<div> </div>
<div> -Zhanping<br><br></div>
<div class="gmail_quote">On Tue, Aug 25, 2009 at 2:42 PM, burlen <span dir="ltr"><<a href="mailto:burlen.loring@gmail.com">burlen.loring@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Hi Zp,<br><br>Thanks for the hint, I hadn't expected that, and was using rk4.<br><br>Burlen<br><br>Zhanping Liu wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div class="im">Hi Burlen:<br> Have you tried the RK-45 integrator? It uses an adaptive step size and hence in many cases makes streamline integration faster than the other two modes (RK-2 and RK-4)? I agree with John in that the low performance exhibited to us might be caused by 'other' (data-depenent) components than the inherent integration part itself, e.g., point location and cell location in an unstructured grid (which are cetainly also related to streamline integration).<br>
Thanks.<br> -Zhanping<br><br></div>
<div class="im">On Mon, Aug 24, 2009 at 7:58 PM, burlen <<a href="mailto:burlen.loring@gmail.com" target="_blank">burlen.loring@gmail.com</a> <mailto:<a href="mailto:burlen.loring@gmail.com" target="_blank">burlen.loring@gmail.com</a>>> wrote:<br>
<br> We've been using the distributed stream tracer to generate<br> 100s-1000s of stream lines per time step. It's very slow, and it<br> doesn't scale at all. The class comments say as much. I'm sure<br>
there is a reason why this implementation was chosen. Is there<br> something that generally prevents real parallel implementation? Is<br> there a better implementation available out there?<br><br> There is this post a while back<br>
<a href="http://www.paraview.org/pipermail/paraview/2009-July/012959.html" target="_blank">http://www.paraview.org/pipermail/paraview/2009-July/012959.html</a><br><br> What's the status?<br><br> Thanks<br> Burlen<br>
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<br><br><br><br>-- <br>Zhanping Liu, PhD<br>Kitware, Inc.<br>28 Corporate Drive<br>Clifton Park, NY 12065-8662<br>Phone: 518-371-3971 x 138<br><a href="http://www.zhanpingliu.org/" target="_blank">http://www.zhanpingliu.org</a><br>
</div></blockquote><br></blockquote></div><br><br clear="all">
<div></div><br>-- <br>Zhanping Liu, PhD<br>Kitware, Inc.<br>28 Corporate Drive<br>Clifton Park, NY 12065-8662<br>Phone: 518-371-3971 x 138<br><a href="http://www.zhanpingliu.org">http://www.zhanpingliu.org</a><br>