psblas3/test/Fileread/getp.f90

!!$ 
!!$              Parallel Sparse BLAS  v2.0
!!$    (C) Copyright 2006 Salvatore Filippone    University of Rome Tor Vergata
!!$                       Alfredo Buttari        University of Rome Tor Vergata
!!$ 
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!!$  
MODULE GETP
  use psb_sparse_mod
  PUBLIC GET_PARMS
  PUBLIC PR_USAGE

CONTAINS
  !
  ! Get iteration parameters from the command line
  !
  SUBROUTINE  GET_PARMS(ICTXT,MTRX_FILE,RHS_FILE,CMETHD,IPART,&
       & AFMT,ISTOPC,ITMAX,ITRACE,NOVR,IPREC,EPS)
    integer      :: ictxt
    Character*40 :: CMETHD, MTRX_FILE, RHS_FILE
    Integer      :: IRET, ISTOPC,ITMAX,ITRACE,IPART,IPREC,NOVR
    Character*40 :: CHARBUF
    real(kind(1.d0)) :: eps
    character    :: afmt*5
    INTEGER      :: IARGC, NP, IAM
    EXTERNAL     IARGC
    INTEGER      :: INPARMS(40), IP 

    call psb_info(ictxt,iam,np)
    IF (IAM==0) THEN
      ! Read Input Parameters
      READ(*,*) IP
      IF (IP.GE.3) THEN
        READ(*,*) MTRX_FILE
        READ(*,*) RHS_FILE
        READ(*,*) CMETHD
        READ(*,*) AFMT

        ! Convert strings in array
        DO I = 1, LEN(MTRX_FILE)
          INPARMS(I) = IACHAR(MTRX_FILE(I:I))
        END DO
        ! Broadcast parameters to all processors
        call psb_bcast(ictxt,inparms(1:40))

        ! Convert strings in array
        DO I = 1, LEN(CMETHD)
          INPARMS(I) = IACHAR(CMETHD(I:I))
        END DO
        ! Broadcast parameters to all processors
        call psb_bcast(ictxt,inparms(1:40))

        DO I = 1, LEN(AFMT)
          INPARMS(I) = IACHAR(AFMT(I:I))
        END DO
        ! Broadcast parameters to all processors
        call psb_bcast(ictxt,inparms(1:40))

        READ(*,*) IPART
        IF (IP.GE.5) THEN
          READ(*,*) ISTOPC
        ELSE
          ISTOPC=1        
        ENDIF
        IF (IP.GE.6) THEN
          READ(*,*) ITMAX
        ELSE
          ITMAX=500
        ENDIF
        IF (IP.GE.7) THEN
          READ(*,*) ITRACE
        ELSE
          ITRACE=-1
        ENDIF
        IF (IP.GE.8) THEN
          READ(*,*) IPREC
        ELSE
          IPREC=0
        ENDIF
        IF (IP.GE.9) THEN
          READ(*,*) NOVR
        ELSE
          NOVR  = 1
        ENDIF
        IF (IP.GE.10) THEN
          READ(*,*) EPS
        ELSE
          EPS=1.D-6
        ENDIF
        ! Broadcast parameters to all processors    

        INPARMS(1) = IPART
        INPARMS(2) = ISTOPC
        INPARMS(3) = ITMAX
        INPARMS(4) = ITRACE
        INPARMS(5) = IPREC
        INPARMS(6) = NOVR
        call psb_bcast(ictxt,inparms(1:6))
        call psb_bcast(ictxt,eps)

        write(*,'("Solving matrix       : ",a40)')mtrx_file      
        write(*,'("Number of processors : ",i3)')np
        write(*,'("Data distribution    : ",i2)')ipart
        write(*,'("Preconditioner       : ",i2)')iprec
        if(iprec.gt.2) write(*,'("Overlapping levels   : ",i2)')novr
        write(*,'("Iterative method     : ",a40)')cmethd
        write(*,'("Storage format       : ",a3)')afmt(1:3)
        write(*,'(" ")')
      else
        call pr_usage(0)
        call psb_exit(ictxt)
        stop 1
      end if
    else
      ! Receive Parameters
      call psb_bcast(ictxt,inparms(1:40))

      do i = 1, 40
        mtrx_file(i:i) = achar(inparms(i))
      end do
      call psb_bcast(ictxt,inparms(1:40))

      DO I = 1, 40
        CMETHD(I:I) = ACHAR(INPARMS(I))
      END DO

      call psb_bcast(ictxt,inparms(1:40))
      DO I = 1, LEN(AFMT)
        AFMT(I:I) = ACHAR(INPARMS(I))
      END DO

      call psb_bcast(ictxt,inparms(1:6))

      ipart  =  inparms(1) 
      istopc =  inparms(2) 
      itmax  =  inparms(3) 
      itrace =  inparms(4) 
      iprec  =  inparms(5) 
      novr     =  inparms(6) 
      call psb_bcast(ictxt,eps)

    end if

  END SUBROUTINE GET_PARMS
  SUBROUTINE PR_USAGE(IOUT)
    INTEGER IOUT
    WRITE(IOUT, *) ' Number of parameters is incorrect!'
    WRITE(IOUT, *) ' Use: hb_sample mtrx_file methd prec [ptype &
         &itmax istopc itrace]' 
    WRITE(IOUT, *) ' Where:'
    WRITE(IOUT, *) '     mtrx_file      is stored in HB format'
    WRITE(IOUT, *) '     methd          may be: CGSTAB '
    WRITE(IOUT, *) '     ptype          Partition strategy default 0'
    WRITE(IOUT, *) '                    0: BLOCK partition '
    WRITE(IOUT, *) '     itmax          Max iterations [500]        '
    WRITE(IOUT, *) '     istopc         Stopping criterion [1]      '
    WRITE(IOUT, *) '     itrace         0  (no tracing, default) or '
    WRITE(IOUT, *) '                    >= 0 do tracing every ITRACE'
    WRITE(IOUT, *) '                    iterations ' 
  END SUBROUTINE PR_USAGE
END MODULE GETP