/opt/matrici/qc2534.mtx                 ! This matrix (and others) from: http://math.nist.gov/MatrixMarket/ or 
NONE                        ! rhs          | http://www.cise.ufl.edu/research/sparse/matrices/index.html
MM                          ! File format: MM (Matrix Market)  HB (Harwell-Boeing).
BICGSTAB                    ! Iterative method: BiCGSTAB BiCG CGS RGMRES BiCGSTABL CG
CSR                         ! Storage format: CSR COO JAD 
0                           ! IPART (partition method): 0 (block)  2 (graph, with Metis) 
2                           ! ISTOPC
01000                       ! ITMAX
-1                          ! ITRACE
30                          ! IRST (restart for RGMRES and BiCGSTABL) 
1.d-5                       ! EPS
3L-M-RAS-I-D4               ! Longer descriptive name for preconditioner (up to 20 chars) 
ML                          ! Preconditioner type: NONE JACOBI BJAC AS ML
0                           ! Number of overlap layers for AS preconditioner
HALO                        ! AS restriction operator: NONE HALO 
NONE                        ! AS prolongation operator: NONE SUM AVG
ILU                         ! AS subdomain solver: DSCALE ILU MILU ILUT UMF SLU MUMPS
1                           ! Fill level P for ILU(P) and ILU(T,P)
1.d-4                       ! Threshold T for ILU(T,P) 
1                           ! Jacobi sweeps for base smoother
3                           ! Number of levels in a multilevel preconditioner
AS                          ! Smoother type  JACOBI BJAC AS ignored for non-ML
SMOOTHED                    ! Type of aggregation: SMOOTHED NONSMOOTHED 
DEC                         ! Type of aggregation: DEC
NATURAL                     ! Ordering of aggregation NATURAL DEGREE
MULT                        ! Type of multilevel correction: ADD MULT
POST                        ! Side of multiplicative correction PRE POST TWOSIDE (ignored for ADD)
REPL                        ! Coarsest-level matrix distribution: DIST  REPL           
BJAC                        ! Coarsest-level solver: JACOBI BJAC UMF SLU SLUDIST MUMPS
ILU                         ! Coarsest-level subsolver: ILU UMF SLU MUMPS SLUDIST (DSCALE for JACOBI)
0                           ! Coarsest-level fillin P for ILU(P) and ILU(T,P)
1.d-4                       ! Coarsest-level threshold T for ILU(T,P) 
4                           ! Number of Jacobi sweeps for BJAC/PJAC coarsest-level solver
0.0125d0                    ! Smoothed aggregation threshold: >= 0.0
0.5                         ! Smoothed aggregation scaling factor.