# these settings converge (1 it): 
# complete factors, partial pivoting
ex1 -pc_ilu_use_drop_tolerance 0.0 \
    -mat_lu_pivotthreshold     1.0  \
    -pc_ilu_col_fill_ratio     -1   \
    -mat_order natural
# these settings converge (166 its): 
# fill drop threashold 0.01, partial pivoting
ex1 -pc_ilu_use_drop_tolerance 0.01 \
    -mat_lu_pivotthreshold     1.0  \
    -pc_ilu_col_fill_ratio     -1   \
    -mat_order natural
# these settings fail to converge in 250 iterations: 
# fill drop threashold 0.1, partial pivoting
ex1 -pc_ilu_use_drop_tolerance 0.1 \
    -mat_lu_pivotthreshold     1.0  \
    -pc_ilu_col_fill_ratio     -1   \
    -mat_order natural
# these settings fail to converge in 250 iterations: 
# column fill ration 1, partial pivoting
ex1 -pc_ilu_use_drop_tolerance 0.0 \
    -mat_lu_pivotthreshold     1.0  \
    -pc_ilu_col_fill_ratio     1   \
    -mat_order natural
# these settings converge (66 its):
# column fill ration 12, partial pivoting
ex1 -pc_ilu_use_drop_tolerance 0.0 \
    -mat_lu_pivotthreshold     1.0  \
    -pc_ilu_col_fill_ratio     12   \
    -mat_order natural


# these settings fail; zero pivot: 
# fill drop threashold 0.1, no pivoting
ex1 -pc_ilu_use_drop_tolerance 0.01 \
    -mat_lu_pivotthreshold     0.0  \
    -pc_ilu_col_fill_ratio     -1   \
    -mat_order natural
# these settings fail; zero pivot: 
# no dropping, no pivoting
ex1 -pc_ilu_use_drop_tolerance 0.0  \
    -mat_lu_pivotthreshold     0.0  \
    -pc_ilu_col_fill_ratio     -1   \
    -mat_order natural

