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<div dir="ltr" class="gmail_attr">On Wed, Mar 13, 2019 at 11:28 AM Matthew Knepley <<a href="mailto:knepley@gmail.com">knepley@gmail.com</a>> wrote:<br>
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<div dir="ltr">On Wed, Mar 13, 2019 at 12:16 PM Zhang, Junchao via petsc-dev <<a href="mailto:petsc-dev@mcs.anl.gov" target="_blank">petsc-dev@mcs.anl.gov</a>> wrote:<br>
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<div dir="ltr">I met some errors with cuda + mumps.</div>
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<div>It does not look like CUDA is being used in these runs. Is it? If not, do you mean MUMPS goes crazy if we even compiler something with CUDA?</div>
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<div>No, the tests do not use GPU. I need further investigation.</div>
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<div> Thanks,</div>
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<div> Matt</div>
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<div dir="ltr">It was tested with</div>
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<div>make -f gmakefile test search='snes_tutorials-ex69_q2p1fetidp_deluxe snes_tutorials-ex62_fetidp_2d_quad snes_tutorials-ex69_q2p1fetidp_deluxe_adaptive ksp_ksp_tutorials-ex52f_mumps'</div>
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<div>I can reproduce it with petsc master. The first line of petsc nightly (<a href="http://ftp.mcs.anl.gov/pub/petsc/nightlylogs/archive/2019/03/12/master.html" target="_blank">http://ftp.mcs.anl.gov/pub/petsc/nightlylogs/archive/2019/03/12/master.html</a>)
shows another error. But I guess they have the same root: PETSc gives random wrong results in some cases. For example, I ran ksp_ksp_tutorials-ex52f_mumps twice and saw</div>
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<div>$ mpirun -n 3 ./ex52f</div>
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<div>Mumps row pivot threshhold = 1.00E-06</div>
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<div>Mumps determinant=( 9.01E-01 0.00E+00)*2^ 99</div>
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<div><b>Norm of error 1.5554E-06 iterations 1</b></div>
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<div>$ mpirun -n 3 ./ex52f</div>
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<div>Mumps row pivot threshhold = 1.00E-06</div>
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<div>Mumps determinant=( 9.01E-01 0.00E+00)*2^ 99</div>
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<div><b>Norm of error 1.6356E-06 iterations 1 </b></div>
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<div>The correct output has "<b>Norm of error < 1.e-12,iterations 1</b>". Currently, I do know the reason.</div>
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<div dir="ltr">--Junchao Zhang</div>
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<div>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</div>
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<div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br>
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