[petsc-dev] Reduction in KSPGetVecs via DMCreateGlobalVector

[Jed Brown]

I don't think it's reasonable to allow this:

#0  0x00007ffff5af9cc0 in PMPI_Allreduce () from /opt/mpich/lib/libmpich.so.12
#1  0x00007ffff61b7436 in PetscSplitOwnership () from /home/jed/petsc/mpich-opt/lib/libpetscsys.so.3.04
#2  0x00007ffff65a44b6 in PetscLayoutSetUp () from /home/jed/petsc/mpich-opt/lib/libpetscvec.so.3.04
#3  0x00007ffff65ff988 in VecCreate_MPI_Private () from /home/jed/petsc/mpich-opt/lib/libpetscvec.so.3.04
#4  0x00007ffff6600082 in VecCreate_MPI () from /home/jed/petsc/mpich-opt/lib/libpetscvec.so.3.04
#5  0x00007ffff6610867 in VecSetType () from /home/jed/petsc/mpich-opt/lib/libpetscvec.so.3.04
#6  0x00007ffff660010f in VecCreate_Standard () from /home/jed/petsc/mpich-opt/lib/libpetscvec.so.3.04
#7  0x00007ffff6610867 in VecSetType () from /home/jed/petsc/mpich-opt/lib/libpetscvec.so.3.04
#8  0x00007ffff6fbe98b in DMCreateGlobalVector_DA () from /home/jed/petsc/mpich-opt/lib/libpetscdm.so.3.04
#9  0x00007ffff70d979e in DMCreateGlobalVector () from /home/jed/petsc/mpich-opt/lib/libpetscdm.so.3.04
#10 0x00007ffff6fbe7d0 in VecDuplicate_MPI_DA () from /home/jed/petsc/mpich-opt/lib/libpetscdm.so.3.04
#11 0x00007ffff660ca11 in VecDuplicate () from /home/jed/petsc/mpich-opt/lib/libpetscvec.so.3.04
#12 0x00007ffff660cf37 in VecDuplicateVecs_Default () from /home/jed/petsc/mpich-opt/lib/libpetscvec.so.3.04
#13 0x00007ffff660cc2e in VecDuplicateVecs () from /home/jed/petsc/mpich-opt/lib/libpetscvec.so.3.04
#14 0x00007ffff7569da1 in KSPGetVecs () from /home/jed/petsc/mpich-opt/lib/libpetscksp.so.3.04
#15 0x00007ffff753b403 in KSPGMRESGetNewVectors () from /home/jed/petsc/mpich-opt/lib/libpetscksp.so.3.04
#16 0x00007ffff753b748 in KSPGMRESCycle () from /home/jed/petsc/mpich-opt/lib/libpetscksp.so.3.04
#17 0x00007ffff753c0cc in KSPSolve_GMRES () from /home/jed/petsc/mpich-opt/lib/libpetscksp.so.3.04
#18 0x00007ffff755e6b0 in KSPSolve () from /home/jed/petsc/mpich-opt/lib/libpetscksp.so.3.04
#19 0x00007ffff7b9cdb0 in SNESSolve_NEWTONLS () from /home/jed/petsc/mpich-opt/lib/libpetscsnes.so.3.04
#20 0x00007ffff7b73c85 in SNESSolve () from /home/jed/petsc/mpich-opt/lib/libpetscsnes.so.3.04
#21 0x000000000040183a in main ()

Found by breaking on PMPI_Allreduce inside

~/petsc/src/snes/examples/tutorials$ mpiexec -n 1 gdb --args ./ex5 -da_refine 3 -ksp_max_it 5 : -n 1 ./ex5 -da_refine 3 -ksp_max_it 5
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