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<p class="MsoNormal">Boonthanome,<o:p></o:p></p>
<p class="MsoNormal">Moving this to the developers list.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kitware – looking at the memory usage below, a few questions:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">Why does merge blocks grow so much? Why can’t this filter just do shallow copies? Is this impossible, or just not implemented?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">Why can’t Merge Blocks do shallow copies? Is this impossible, or just not implemented?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">(I think I know this one, but here it is). Why does the ghost cell generator bloat memory so much? Can’t you just use shallow copies of the primary data, and then add the ghost cells?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">Why can’t we have the cell data to point data filter be smart enough to add ghost cells if necessary for calculations, then throw them away?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">Any other ideas how to decrease the bloat of about 4 GB of data to be about 18 GB of data?<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks team,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Alan<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Boonthanome Nouanesengsy [mailto:gitlab@gitlab.kitware.com]
<br>
<b>Sent:</b> Thursday, March 15, 2018 4:39 PM<br>
<b>To:</b> Scott, W Alan <wascott@sandia.gov><br>
<b>Subject:</b> [EXTERNAL] Re: ParaView | Memory consumption on Paraview (#18035)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p><span lang="EN">I tried the Pass Arrays pipeline again from a clean node. I got the node, and made a client/server connection. I basically got similar values.
<o:p></o:p></span></p>
<p><span lang="EN">Using Pass Arrays again:<o:p></o:p></span></p>
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<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo1">
<span lang="EN">before loading data: 1.58 GB<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo1">
<span lang="EN">after loading data: 5.70 GB<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo1">
<span lang="EN">after pass arrays (1 cell array): 5.84 GB<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo1">
<span lang="EN">after Merge Blocks: 9.38 GB<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo1">
<span lang="EN">after ghost cells: 22.23 GB<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo1">
<span lang="EN">after cell data to point data: 22.23 GB<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo1">
<span lang="EN">after show surface: 22.43 GB<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo1">
<span lang="EN">after contour: 22.43 GB<o:p></o:p></span></li></ul>
<p><span lang="EN">The original data is about 4 GB, so it seems a bit much that the ghost cells filter will add 13 GB. Yes, it does make a copy of the data, padded with ghost cells, but the added ghost cells should not triple the amount of memory used.
<o:p></o:p></span></p>
<p><span lang="EN">Alan, the result of using Pass Arrays is that the output of a filter will have less arrays, and take less memory, correct? For example, if I do Pass Arrays -> Merge Blocks, then after applying Merge Blocks I only see one array available.<o:p></o:p></span></p>
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<p><span lang="EN" style="font-size:12.0pt;color:#777777">— <br>
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