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<div dir="ltr">You need to test on your personal computer with multiple MPI processes (e.g., mpirun -n 2 ...) before moving to big machines. You may also need to configure petsc with --with-dedugging=1 --COPTFLAGS="-O0 -g" etc to ease debugging.<br clear="all">
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<div dir="ltr">--Junchao Zhang</div>
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<div dir="ltr" class="gmail_attr">On Sat, Jul 20, 2019 at 11:03 AM Yuyun Yang via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>> wrote:<br>
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<p class="MsoNormal">Hello team,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I’m encountering a problem with my code’s behavior on multiple processors. When I run it on my personal computer it works just fine, but when I use it on our computing cluster it produces an error (in one of the root-finding functions,
an assert statement is not satisfied) and aborts.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">If I just run on one processor then both machines can run the code just fine, but they give different results (maybe due to roundoff errors).<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I’m not sure how to proceed with debugging (since I usually do it on my own computer which didn’t seem to encounter a bug) and would appreciate your advice. Thank you!<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Best regards,<u></u><u></u></p>
<p class="MsoNormal">Yuyun<u></u><u></u></p>
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