[petsc-users] Different behavior of code on different machines

[Zhang, Junchao]

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.
--Junchao Zhang


On Sat, Jul 20, 2019 at 11:03 AM Yuyun Yang via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
Hello team,

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.

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).

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!

Best regards,
Yuyun
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20190720/f75621e0/attachment.html>