---- sequential ----
  factor A = L*U: 2.04412 sec
  solve A*X = B: 3.28619 sec
  form R = B-A*X: 1.8061 sec
  |R|/|B| = 8.77886e-12
  total: 7.16741
  
---- parallel ----
  (0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%)
  factor A = L*U: 1.31708 sec
  (0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%)
  (0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%)
  solve A*X = B: 0.944054 sec
  (0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%)
  form R = B-A*X: 0.811046 sec
  |R|/|B| = 8.60419e-12
  total: 3.09918

