Another interesting phenomenon is that it works for an iterative solver, but only failed for direct solvers(both superLU_dist and mumps). If something is not initialized correctly, why doesn't the iterative solver, for example, GMRES, throw any errors?
On Mon, Jul 25, 2016 at 11:50 AM, Matthew Knepley <[email protected]> wrote: > On Mon, Jul 25, 2016 at 9:17 AM, Xujun Zhao <[email protected]> wrote: > >> Hi all, >> >> I am trying to solve my problem with a direct solver superLU_dist. >> But the KSPSolve failed in the "opt" mode. I shifted to the "dbg" version >> and wanted to see what error info I can get from the PETSc. Surprisingly, >> it passed the solve and didn't output any errors in the "dbg" version. Does >> anyone have the similar experience? and what type of potential bugs it may >> have? >> > > Debugging mode initializes all variables, but as Hong says, valgrind will > warn you of uninitialized variables. > > Matt > > >> >> --->test in StokesSolver::solve(): Start the KSP solve... >> >> [0]PETSC ERROR: >> ------------------------------------------------------------------------ >> >> [0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation, >> probably memory access out of range >> >> [0]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger >> >> [0]PETSC ERROR: or see >> http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind >> >> [0]PETSC ERROR: or try http://valgrind.org on GNU/linux and Apple Mac OS >> X to find memory corruption errors >> >> [0]PETSC ERROR: configure using --with-debugging=yes, recompile, link, >> and run >> >> [0]PETSC ERROR: to get more information on the crash. >> >> [0]PETSC ERROR: --------------------- Error Message >> -------------------------------------------------------------- >> >> [0]PETSC ERROR: Signal received >> >> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html >> for trouble shooting. >> >> [0]PETSC ERROR: Petsc Release Version 3.7.2, unknown >> >> [0]PETSC ERROR: ./example-dbg on a arch-darwin-c-opt named >> mcswl091.mcs.anl.gov by xzhao Mon Jul 25 11:10:12 2016 >> >> [0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++ >> --with-fc=gfortran --download-mpich --download-fblaslapack >> --download-scalapack --download-mumps --download-superlu_dist >> --download-hypre --download-ml --download-metis --download-parmetis >> --download-triangle --download-chaco --with-debugging=0 >> >> [0]PETSC ERROR: #1 User provided function() line 0 in unknown file >> >> application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0 >> >> >> > > > -- > What most experimenters take for granted before they begin their > experiments is infinitely more interesting than any results to which their > experiments lead. > -- Norbert Wiener >
