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<div dir="ltr">I do not know the reason.<br clear="all">
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<div dir="ltr">--Junchao Zhang</div>
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<div dir="ltr" class="gmail_attr">On Wed, Mar 13, 2019 at 11:15 AM Junchao Zhang <<a href="mailto:jczhang@mcs.anl.gov">jczhang@mcs.anl.gov</a>> wrote:<br>
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<div dir="ltr">I met some errors with cuda + mumps. 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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