On Wed, Nov 30, 2011 at 10:08 AM, Alexander Grayver <span dir="ltr"><<a href="mailto:agrayver@gfz-potsdam.de">agrayver@gfz-potsdam.de</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;">
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On 30.11.2011 16:22, Matthew Knepley wrote:
<blockquote type="cite">On Wed, Nov 30, 2011 at 9:10 AM, Alexander Grayver <span dir="ltr"><<a href="mailto:agrayver@gfz-potsdam.de" target="_blank">agrayver@gfz-potsdam.de</a>></span>
wrote:<br>
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<div bgcolor="#ffffff" text="#000000"> I'm not sure that
MAT(S)BAIJ is what I need. My matrix symmetric, but not
block. <br>
Well, I solve vector equations and there are 2-3 blocks
(depending on the problem dimension), but this blocks
normaly have size of > 10^5. So which block size should I
specify to be efficient?<br>
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<div>Just use 1.</div>
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And for d_nz/o_nz also 1? <br></div></blockquote><div><br></div><div>No, preallocate for the nonzeros you enter, as normal.</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;">
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<div> Matt</div>
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<div bgcolor="#ffffff" text="#000000"> Regards,<br>
Alexander<br>
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On 30.11.2011 14:27, Alexander Grayver wrote:
<blockquote type="cite"> Thanks Matt!<br>
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Regards,<br>
Alexander<br>
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On 30.11.2011 14:16, Matthew Knepley wrote:
<blockquote type="cite">On Wed, Nov 30, 2011 at 3:43 AM,
Alexander Grayver <span dir="ltr"><<a href="mailto:agrayver@gfz-potsdam.de" target="_blank">agrayver@gfz-potsdam.de</a>></span>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> Hello,<br>
<br>
I'm trying to use mumps through PETSc now with
symmetric matrix and cholesky factorization.<br>
When I use it directly I fill up only upper part of
the matrix and set mumid%SYM = 2. Is that possible
to follow same way with petsc?<br>
Which options do I have to choose?<br>
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<div><a href="http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MATSBAIJ.html" target="_blank">http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MATSBAIJ.html</a></div>
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<div> Matt</div>
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<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> Thanks in advance.<br>
<br>
Regards,<br>
<font color="#888888"> Alexander<br>
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-- <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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-- <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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</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>