On Tue, Jul 17, 2012 at 6:20 AM, Nicolas TARDIEU <span dir="ltr"><<a href="mailto:nicolas.tardieu@edf.fr" target="_blank">nicolas.tardieu@edf.fr</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">
<br><font face="sans-serif">Dear PETSc users,</font>
<br>
<br><font face="sans-serif">I am solving an unstructured finite
element-based problem with 500 millions unkwowns with PETSc.<br>
The number of nonzeros is greater than 2^31-1. </font>
<br><font face="sans-serif">Here is the KSPView I get : </font>
<br><font face="Courier New">----------------------------------------------------------------------------------------------------------------</font>
<br><font face="Courier New"> Matrix Object: 700 MPI
processes </font>
<br><font face="Courier New"> type: mpiaij</font>
<br><font face="Courier New"> rows=499125000, cols=499125000</font>
<br><font face="Courier New"> total: nonzeros=-<a href="tel:2147483648" value="+12147483648" target="_blank">2147483648</a>,
allocated nonzeros=-<a href="tel:2147483648" value="+12147483648" target="_blank">2147483648</a></font>
<br><font face="Courier New"> total number of mallocs
used during MatSetValues calls =0</font>
<br><font face="Courier New"> using I-node (on
process 0) routines: found 242923 nodes, limit used is 5</font>
<br><font face="Courier New">----------------------------------------------------------------------------------------------------------------<br>
</font>
<br><font face="sans-serif">As you can see, The number of nonzeros
is <0.</font>
<br><font face="sans-serif">I would like to check that this is due
to the number of nonzeros being greater than 2^31-1.</font>
<br>
<br><font face="sans-serif">Here is a short description of the size
of differents types : </font>
<br><font face="Courier New">----------------------------------------------------------------------------------------------------------------</font>
<br><font face="Courier New">Compiled with full precision matrices
(default)</font>
<br><font face="Courier New">sizeof(short) 2 sizeof(int) 4 sizeof(long)
8 sizeof(void*) 8 sizeof(PetscScalar) 8</font>
<br><font face="Courier New">----------------------------------------------------------------------------------------------------------------</font>
<br>
<br><font face="sans-serif">Is there a workaround? Should I worry
about the result of my simulation?</font>
<br></blockquote><div><br></div><div>You could configure using --with-64-bit-indices.</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">
<font face="sans-serif">Thanks in advance,</font>
<br><font face="sans-serif">Nicolas</font>
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<td><font size="1" color="#ff8100" face="Arial"><b>Nicolas TARDIEU</b></font><font size="1" color="#ff8100" face="Arial"><b><br>
Ing. Chercheur</b></font><font size="1" color="#0062e1" face="Arial"><br>
EDF - R&D Dpt AMA</font><font size="1" color="#0062e1" face="sans-serif"><br>
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<br><font size="1" color="#0062e1" face="Arial"><b><a href="mailto:nicolas.tardieu@edf.fr" target="_blank">nicolas.tardieu@edf.fr</a></b></font>
<br><font size="1" color="#0062e1" face="Arial">Tél. : 01 47 65 39 05</font>
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</td><td><font size="1" color="#0062e1" face="Arial">Un geste simple pour l'environnement,
n'imprimez ce message que si vous en avez l'utilité.</font></td></tr></tbody></table>
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