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On 12/12/2014 16:07, Matthew Knepley wrote:<br>
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cite="mid:CAMYG4Gm8m3YHNgi+-mGRPuS03ZuxE+xRB9K1bQ0B-L91Ewfixg@mail.gmail.com"
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<div class="gmail_quote">On Fri, Dec 12, 2014 at 8:58 AM,
David Scott <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:d.scott@ed.ac.uk" target="_blank">d.scott@ed.ac.uk</a>></span>
wrote:
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">How can
I get GAMG to take into account the fact that I have more
than one degree of freedom per node when it is producing a
coarser grid? I am dealing with a problem in structural
mechanics and have an unstructued grid. The matrix is read
from a file produced by another application. The
components of the displacement for a node are grouped
together.<br>
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<div>GAMG uses the block size from the matrix. Did you set
that?</div>
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<div> Thanks,</div>
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<div> Matt</div>
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I did set the block size but I had a strange result from one of my
runs and I wanted to check that I had done the right thing. I had
seen the performance improvement that I expected for a 10^6 x 10^6
matrix but not for a 10^7 x 10^7 matrix (for which the performance
was worse). I have subsequently tried a matrix of intermediate size
for which I did see a performance improvement. I'll try to find out
what is happening with the largest matrix.<br>
<br>
Thanks,<br>
<br>
David<br>
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