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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">In snes examples/tutorials ex55, there is a comment saying that one can use the following options for running this example:
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./ex55 -ksp_type fgmres -pc_type fieldsplit -pc_fieldsplit_detect_saddle_point -pc_fieldsplit_type schur -pc_fieldsplit_schur_precondition self -fieldsplit_1_ksp_type fgmres -fieldsplit_1_pc_type lsc -snes_vi_monitor -ksp_monitor_true_residual -fieldsplit_ksp_monitor
-fieldsplit_0_pc_type hypre -da_grid_x 65 -da_grid_y 65 -snes_atol 1.e-11 -ksp_rtol 1.e-8</p>
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<span style="font-family: Tahoma; font-size: 13px;">However it gives me the following error message: </span></p>
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0 SNES VI Function norm 3.976439267245e-05 Active lower constraints 2001/2241 upper constraints 314/397 Percent of total 0.136982 Percent of bounded 0.182643</p>
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[0]PETSC ERROR: ------------------------------------------------------------------------</p>
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[0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation, probably memory access out of range</p>
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[0]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger</p>
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[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</p>
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[0]PETSC ERROR: likely location of problem given in stack below</p>
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[0]PETSC ERROR: --------------------- Stack Frames ------------------------------------</p>
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[0]PETSC ERROR: Note: The EXACT line numbers in the stack are not available,</p>
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[0]PETSC ERROR: INSTEAD the line number of the start of the function</p>
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[0]PETSC ERROR: is given.</p>
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[0]PETSC ERROR: [0] PCFieldSplitSetDefaults line 310 src/ksp/pc/impls/fieldsplit/fieldsplit.c</p>
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[0]PETSC ERROR: [0] PCSetUp_FieldSplit line 457 src/ksp/pc/impls/fieldsplit/fieldsplit.c</p>
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[0]PETSC ERROR: [0] PCSetUp line 868 src/ksp/pc/interface/precon.c</p>
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[0]PETSC ERROR: [0] KSPSetUp line 192 src/ksp/ksp/interface/itfunc.c</p>
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[0]PETSC ERROR: [0] SNESSolve_VINEWTONRSLS line 347 src/snes/impls/vi/rs/virs.c</p>
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[0]PETSC ERROR: [0] SNESSolve line 3589 src/snes/interface/snes.c</p>
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[0]PETSC ERROR: --------------------- Error Message ------------------------------------</p>
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[0]PETSC ERROR: Signal received!</p>
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[0]PETSC ERROR: ------------------------------------------------------------------------</p>
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[0]PETSC ERROR: Petsc Release Version 3.4.4, Mar, 13, 2014 </p>
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[0]PETSC ERROR: See docs/changes/index.html for recent updates.</p>
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[0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.</p>
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[0]PETSC ERROR: See docs/index.html for manual pages.</p>
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[0]PETSC ERROR: ------------------------------------------------------------------------</p>
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[0]PETSC ERROR: ./ex55 on a linux-gnu named Huis-MacBook-Pro.local by Paul Tue Jul 15 18:42:59 2014</p>
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[0]PETSC ERROR: Libraries linked from /usr/local/petsc-3.4.4/linux-gnu/lib</p>
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[0]PETSC ERROR: Configure run at Fri Jun 13 23:47:57 2014</p>
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[0]PETSC ERROR: Configure options PETSC_ARCH=linux-gnu --with-cc=gcc --with-fc=gfortran --download-mpich</p>
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[0]PETSC ERROR: ------------------------------------------------------------------------</p>
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[0]PETSC ERROR: User provided function() line 0 in unknown directory unknown file</p>
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application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0</p>
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[unset]: aborting job:</p>
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application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0</p>
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<div>Do you might know what's going on? Another strange issue is that I typed the following command: </div>
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./ex55 -help | grep -A5 fieldsplit</p>
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<span style="font-family: Tahoma; font-size: 13px;">The output is:</span></p>
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eisenstat ilu icc cholesky asm gasm ksp composite redundant nn mat fieldsplit galerkin exotic hmpi asa cp lsc redistribute svd gamg tfs (PCSetType)</p>
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-pc_use_amat: <FALSE> use Amat (instead of Pmat) to define preconditioner in nested inner solves (PCSetUseAmat)</p>
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ILU Options</p>
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-pc_factor_in_place: <FALSE> Form factored matrix in the same memory as the matrix (PCFactorSetUseInPlace)</p>
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-pc_factor_fill <1>: Expected non-zeros in factored matrix (PCFactorSetFill)</p>
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-pc_factor_shift_type <INBLOCKS> (choose one of) NONE NONZERO POSITIVE_DEFINITE INBLOCKS (PCFactorSetShiftType)</p>
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<span style="font-family: Tahoma; font-size: 13px;">While I'm actually expecting to have something such as </span></p>
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-pc_fieldsplit_detect_saddle_point </p>
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<span style="font-family: Tahoma; font-size: 10pt;">coming out. Then isn't it one of the possible options? </span></p>
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