mld_mat.mtx                 ! This matrix (and others) from: http://math.nist.gov/MatrixMarket/ or 
mld_rhs.mtx                 ! rhs          | http://www.cise.ufl.edu/research/sparse/matrices/index.html
NONE                        ! Initial guess
NONE                         !mld_sol.mtx                 ! Reference solution
MM                          ! File format: MatrixMarket or Harwell-Boeing
CSR                         ! Storage format: CSR COO JAD 
GRAPH                       ! PART (partition method): BLOCK GRAPH
BICGSTAB                   ! Iterative method: BiCGSTAB BiCGSTABL BiCG CG CGS FCG GCR RGMRES
2                           ! ISTOPC
00500                       ! ITMAX
1                           ! ITRACE
30                          ! IRST (restart for RGMRES and BiCGSTABL) 
1.d-6                       ! EPS
ML-VCYCLE-FBGS-R-UMF        ! Longer descriptive name for preconditioner (up to 20 chars) 
ML                          ! Preconditioner type: NONE JACOBI BJAC AS ML
1                           ! Number of sweeps for 1-level, outer sweeps for ML; lines below ignored for non-ML
WCYCLE                      ! Type of multilevel CYCLE: VCYCLE WCYCLE KCYCLE MULT ADD
-3                          ! Max Number of levels in a multilevel preconditioner; if <0, lib default
-3                          ! Target coarse matrix size; if <0, lib default
SMOOTHED                    ! Type of aggregation: SMOOTHED UNSMOOTHED
SYMDEC                         ! Parallel aggregation: DEC, SYMDEC
NATURAL                     ! Ordering of aggregation NATURAL DEGREE
NOFILTER                    ! Filtering of matrix ? FILTER NOFILTER
-1.5                        ! Coarsening ratio, if < 0 use library default
2                           ! Number of thresholds in vector, next line ignored if <= 0
0.05 0.025                  ! Thresholds 
0.0100d0                    ! Smoothed aggregation threshold: >= 0.0
BJAC                        ! Smoother type JACOBI GS BGS BJAC AS; ignored for non-ML
1                           ! Number of sweeps for (pre) smoother
0                           ! Number of overlap layers for AS preconditioner
HALO                        ! AS restriction operator: NONE HALO 
NONE                        ! AS prolongation operator: NONE SUM AVG
ILU                      ! Subdomain solver: JACOBI BS BGS ILU ILUT MILU MUMPS SLU UMF
0                           ! Fill level P for ILU(P) and ILU(T,P)
1.d-4                       ! Threshold T for ILU(T,P) 
NONE                        ! Second (post) smoother, ignored if NONE
1                           ! Number of sweeps for (post) smoother
0                           ! Number of overlap layers for AS preconditioner
HALO                        ! AS restriction operator: NONE HALO 
NONE                        ! AS prolongation operator: NONE SUM AVG
JACOBI                      ! Subdomain solver: JACOBI BS BGS ILU ILUT MILU MUMPS SLU UMF
0                           ! Fill level P for ILU(P) and ILU(T,P)
1.d-4                       ! Threshold T for ILU(T,P) 
DEFLT                       ! Coarsest-level solver: MUMPS UMF SLU SLUDIST JACOBI GS BJAC 
ILU                        ! Coarsest-level subsolver: ILU UMF SLU MUMPS SLUDIST
DIST                        ! Coarsest-level matrix distribution: DIST  REPL           
1                           ! Coarsest-level fillin P for ILU(P) and ILU(T,P)
1.d-4                       ! Coarsest-level threshold T for ILU(T,P) 
1                           ! Number of Jacobi sweeps for JACOBI/GS/BJAC coarsest-level solver