I'm honestly stumped. I have some petsc code that essentially just populates a matrix in parallel, then puts it in a file. All my code that uses floating point computations is checked for NaN's and infinities and it doesn't seem to show up. However, when I run it on more than 4 cores, I get floating point exceptions that kill the program. I tried turning off the exceptions from petsc, but the program still dies from them, just without the petsc error message.
I honestly don't know where to go, I suppose I should attach a debugger, but I'm not sure how to do that for multi-processor code. any ideas? (long error message below): -Andrew [14]PETSC ERROR: ------------------------------------------------------------------------ [14]PETSC ERROR: Caught signal number 8 FPE: Floating Point Exception,probably divide by zero [14]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger [14]PETSC ERROR: or see http://www.mcs.anl.gov/petsc/petsc-as/documentation/faq.html#valgrind[14]PETSC ERROR: or try http://valgrind.org on GNU/linux and Apple Mac OS X to find memory corruption errors [14]PETSC ERROR: likely location of problem given in stack below [14]PETSC ERROR: --------------------- Stack Frames ------------------------------------ [14]PETSC ERROR: Note: The EXACT line numbers in the stack are not available, [14]PETSC ERROR: INSTEAD the line number of the start of the function [14]PETSC ERROR: is given. [14]PETSC ERROR: --------------------- Error Message ------------------------------------ [14]PETSC ERROR: Signal received! [14]PETSC ERROR: ------------------------------------------------------------------------ [14]PE[15]PETSC ERROR: ------------------------------------------------------------------------ [15]PETSC ERROR: Caught signal number 8 FPE: Floating Point Exception,probably divide by zero [15]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger [15]PETSC ERROR: or see http://www.mcs.anl.gov/petsc/petsc-as/documentation/faq.html#valgrind[15]PETSC ERROR: or try http://valgrind.org on GNU/linux and Apple Mac OS X to find memory corruption errors [15]PETSC ERROR: likely location of problem given in stack below [15]PETSC ERROR: --------------------- Stack Frames ------------------------------------ [15]PETSC ERROR: Note: The EXACT line numbers in the stack are not available, [15]PETSC ERROR: INSTEAD the line number of the start of the function [15]PETSC ERROR: is given. [15]PETSC ERROR: --------------------- Error Message ------------------------------------ [15]PETSC ERROR: Signal received! [15]PETSC ERROR: ------------------------------------------------------------------------ [15]PETSC ERROR: Petsc Release Version 3.2.0, Patch 6, Wed Jan 11 09:28:45 CST 2012 [14]PETSC ERROR: See docs/changes/index.html for recent updates. [14]PETSC ERROR: See docs/faq.html for hints about trouble shooting. [14]PETSC ERROR: See docs/index.html for manual pages. [14]PETSC ERROR: ------------------------------------------------------------------------ [14]PETSC ERROR: /home/becker/ansp6066/local/bin/finddme on a linux-gnu named photon9.colorado.edu by ansp6066 Fri Apr 27 18:01:55 2012 [14]PETSC ERROR: Libraries linked from /home/becker/ansp6066/local/petsc-3.2-p6/lib [14]PETSC ERROR: Configure run at Mon Feb 27 11:17:14 2012 [14]PETSC ERROR: Configure options --prefix=/home/becker/ansp6066/local/petsc-3.2-p6 --with-c++-support --with-fortran --with-mpi-dir=/usr/local/mpich2 --with-shared-libraries=0 --with-scalar-type=complex --with-blas-lapack-libs=/central/intel/mkl/lib/em64t/libmkl_core.a --with-clanguage=cxx [14]PETSC ERROR: ------------------------------------------------------------------------ [14]TSC ERROR: Petsc Release Version 3.2.0, Patch 6, Wed Jan 11 09:28:45 CST 2012 [15]PETSC ERROR: See docs/changes/index.html for recent updates. [15]PETSC ERROR: See docs/faq.html for hints about trouble shooting. [15]PETSC ERROR: See docs/index.html for manual pages. [15]PETSC ERROR: ------------------------------------------------------------------------ [15]PETSC ERROR: /home/becker/ansp6066/local/bin/finddme on a linux-gnu named photon9.colorado.edu by ansp6066 Fri Apr 27 18:01:55 2012 [15]PETSC ERROR: Libraries linked from /home/becker/ansp6066/local/petsc-3.2-p6/lib [15]PETSC ERROR: Configure run at Mon Feb 27 11:17:14 2012 [15]PETSC ERROR: Configure options --prefix=/home/becker/ansp6066/local/petsc-3.2-p6 --with-c++-support --with-fortran --with-mpi-dir=/usr/local/mpich2 --with-shared-libraries=0 --with-scalar-type=complex --with-blas-lapack-libs=/central/intel/mkl/lib/em64t/libmkl_core.a --with-clanguage=cxx [15]PETSC ERROR: ------------------------------------------------------------------------ [15]PETSC ERROR: User provided function() line 0 in unknown directory unknown file application called MPI_Abort(MPI_COMM_WORLD, 59) - process 14PETSC ERROR: User provided function() line 0 in unknown directory unknown file application called MPI_Abort(MPI_COMM_WORLD, 59) - process 15[0]0:Return code = 0, signaled with Interrupt
