Rajat, > The issue is that I get an error (mentioned below, Info(1) = -9, Info(2) = > 188672) when I run the code on greater than 2 nodes ( ~40 processors). There > is no error on running the code on 2 nodes or less. I looked in the manual > to see what the error Info(1) = -9 means. Also, the time at which the error > happens is random.
I haven't seen this error before. I can see several potential reasons for this: 1. You are doing something that causes a large number of entries per row (very large number of couplings, maybe some weird constraints?) 2. We have a bug in deal.II that could be related to not communicating things correctly to PETSc or within PETSc how it hands stuff to MUMPS. This could be likely to happen if a single processor has no own DoFs. You can experiment with a tiny test problem and many processors and see if that triggers it. 3. Your matrix is not invertible but you only trigger a problem with MUMPS in certain cases. 4. You actually need to change the settings for MUMPS. It looks like this is easy to do: https://urldefense.proofpoint.com/v2/url?u=https-3A__www.mcs.anl.gov_petsc_petsc-2Dcurrent_docs_manualpages_Mat_MATSOLVERMUMPS.html&d=DwIBaQ&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=4k7iKXbjGC8LfYxVJJXiaYVu6FRWmEjX38S7JmlS9Vw&m=EsoKswmf7wHHqLsosvyPZ-wn9Gx1iDt69A7APCDil-Y&s=9hrcHEAv7BOgDg1kjclulz4bnJ6WHbMG4QpsHbAVhDc&e= -- Timo Heister http://www.math.clemson.edu/~heister/ -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
