petsc_miscellany

$ bash ./test_coloring.sh 
color type: sl
Loaded matrix file ./jacobian_sparsity.dat
Computing coloring.
MatColoring Object: 16 MPI processes
  type: sl
  Weight type: RANDOM
  Distance 2, Max. Colors 65535
  Number of colors 355
  Number of total columns 76800

real	0m1.693s
user	0m16.976s
sys	0m3.292s
color type: lf
Loaded matrix file ./jacobian_sparsity.dat
Computing coloring.
MatColoring Object: 16 MPI processes
  type: lf
  Weight type: RANDOM
  Distance 2, Max. Colors 65535
  Number of colors 500
  Number of total columns 76800

real	0m1.315s
user	0m15.596s
sys	0m3.072s
color type: jp
Loaded matrix file ./jacobian_sparsity.dat
Computing coloring.
MatColoring Object: 16 MPI processes
  type: jp
  Weight type: RANDOM
  Distance 2, Max. Colors 65535
  Number of colors 709
  Number of total columns 76800

real	0m29.137s
user	7m42.480s
sys	0m1.184s
color type: id
Loaded matrix file ./jacobian_sparsity.dat
Computing coloring.
MatColoring Object: 16 MPI processes
  type: id
  Weight type: RANDOM
  Distance 2, Max. Colors 65535
  Number of colors 400
  Number of total columns 76800

real	0m1.334s
user	0m16.400s
sys	0m3.120s
color type: greedy
Loaded matrix file ./jacobian_sparsity.dat
Computing coloring.
MatColoring Object: 16 MPI processes
  type: greedy
  Weight type: RANDOM
  Distance 2, Max. Colors 65535
  Number of colors 390
  Number of total columns 76800

real	0m1.811s
user	0m26.444s
sys	0m0.772s