On Mon, Dec 5, 2011 at 8:17 AM, Dominik Szczerba <span dir="ltr"><<a href="mailto:dominik@itis.ethz.ch">dominik@itis.ethz.ch</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;">
I am on a Cray system, where I have configured and built petsc 3.2 p5<br>
myself, only using the vendor provided mpi, all the other packages<br>
(parmetis, hypre, mumps) are built with --download-package. "Make ...<br>
test" does not work here to verify the correct build because users do<br>
not have access to mpiexec. So I do the test by hand, and I am unsure<br>
about what I am getting. When executing the test ex19 with the<br>
system's scheduler I get this output:<br>
<br>
lid velocity = 0.0204082, prandtl # = 1, grashof # = 1<br>
Number of Newton iterations = 2<br>
lid velocity = 0.0204082, prandtl # = 1, grashof # = 1<br>
Number of Newton iterations = 2<br>
<br>
It's quite different from the expected output in ex19_1.testout:<br>
<br>
lid velocity = 0.0016, prandtl # = 1, grashof # = 1<br>
Number of Newton iterations = 2<br>
lid velocity = 0.0016, prandtl # = 1, grashof # = 1<br>
Number of Newton iterations = 2<br></blockquote><div><br></div><div>Are you running with the right options? -dmmg_nlevels 4 -snes_monitor_short</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;">
Does it mean that I have screwed up the build somehow, or is this<br>
somehow the effect of the batching system, or just numerical<br>
uncertainty due to the parallel computation? Note: I get the same<br>
result with 1 and a few MPI processes.<br>
<br>
Many thanks for any ideas.<br>
<font color="#888888"><br>
Dominik<br>
</font></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>