On Fri, Dec 30, 2011 at 10:34, Dominik Szczerba <dominik at itis.ethz.ch>wrote:
> Very useful hint that with -fp_trap. I get trapped at: > > Program received signal SIGFPE, Arithmetic > exception.0x00000000010fad4e in hypre_BoomerAMGRelax (A=0x1b56e9a0, > f=0x195487b0, cf_marker=0x692b900, relax_type=6, relax_points=1, > relax_weight=1, omega=1, l1_norms=0x0, u=0xb0f8aa0, > Vtemp=0x18fd1900, Ztemp=0x0) at par_relax.c:19251925 > u_data[i] = res / A_diag_data[A_diag_i[i]]; > with res = -2.4683099805590231e+303 and A_diag_data[A_diag_i[i]] = > 9.287739686222747e-06. The full backtrace goes through many boomeramg > lines to point back at the end to my code where (in a custom > preconditioner) I solve a linear system with KSPGMRES and > PCHYPRE/boomeramg. I guess I will proceed now with inspecting the > values by hand, but if there still are some useful Petsc tricks I am > eager to hear. > Is your system singular? Or perhaps the BoomerAMG smoother is not stable for your problem. You didn't show the full stack. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111230/6146b401/attachment.htm>
