<div dir="ltr">Use clip.SetInputConnection(input.GetOutputPort()).<br><br>Otherwise it will make a copy of the input foe each iteration!<br><br>Jothy<br><br><div class="gmail_quote">On Thu, Oct 27, 2011 at 11:04 AM, Bryn Lloyd <span dir="ltr"><<a href="mailto:lloyd@itis.ethz.ch">lloyd@itis.ethz.ch</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div link="blue" vlink="purple" lang="EN-US"><div><p class="MsoNormal">Is the memory usage higher in python than in C++?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">I am not sure, but am having issues with large memory usage for simple things like clipping a large dataset.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">My system memory usage is around 20GB, the dataset on file is “only” 2GB.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">The pipeline looks like this: reader->clip polydata->writer<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">How can I reduce the memory footprint? Here is some example code:<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">reader = vtkXMLPolyDataReader()<u></u><u></u></p><p class="MsoNormal">reader.SetFileName(ifname)<u></u><u></u></p><p class="MsoNormal">reader.Update()<u></u><u></u></p><p class="MsoNormal">input = reader.GetOutput()<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"># do multiple clips<u></u><u></u></p><p class="MsoNormal">for k in range(10):<u></u><u></u></p><p class="MsoNormal"> # compute implicit box (not shown)<u></u><u></u></p>
<p class="MsoNormal"> clip = vtkClipPolyData()<u></u><u></u></p><p class="MsoNormal"> clip.SetClipFunction(box)<u></u><u></u></p><p class="MsoNormal"> clip.SetInput(input)<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal"> fnameo = bnameo + "_clipped%05d.vtp" % k<u></u><u></u></p><p class="MsoNormal"> writer = vtkXMLPolyDataWriter()<u></u><u></u></p>
<p class="MsoNormal"> writer.SetInput(clip.GetOutput())<u></u><u></u></p><p class="MsoNormal"> writer.SetFileName(fnameo)<u></u><u></u></p><p class="MsoNormal"> writer.SetDataModeToAppended()<u></u><u></u></p>
<p class="MsoNormal"> writer.SetEncodeAppendedData(0)<u></u><u></u></p><p class="MsoNormal"> writer.Write()<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks<u></u><u></u></p><p class="MsoNormal">Bryn<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p></div></div><br>_______________________________________________<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br><div dir="ltr">Jothybasu K Selvaraj<br>PhD Student<br>University of Liverpool<br>Liverpool,UK<br></div><br>
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