<div class="gmail_extra">On Fri, Apr 27, 2012 at 5:46 PM, Kyungjoo Kim <span dir="ltr"><<a href="mailto:iamkyungjoo@gmail.com" target="_blank">iamkyungjoo@gmail.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hello,<br>
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I am wondering if you do something like reordering (nested dissection or minimum degree) when you perform ilu.<br></blockquote><div><br></div><div><a href="http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/PC/PCFactorSetMatOrderingType.html#PCFactorSetMatOrderingType">http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/PC/PCFactorSetMatOrderingType.html#PCFactorSetMatOrderingType</a></div>
<div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I do experiments with one reordered by nested dissection and the other one is reordered opposite way.<br>
(BTW, ilu does not do pivoting but isn't it possible to do pivot if petsc find out block matrices such like supernodes ? )<br>
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Somehow both behave in the same way. Do you internally reorder a matrix ? ( I could not find out any clue about this in reference manual)<br>
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Thank you.<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>
-- Norbert Wiener<br>
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