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      implicit none
      
#include "lisf.h"

      LIS_MATRIX A
      LIS_VECTOR b,x,u
      LIS_SOLVER solver
      LIS_INTEGER ierr
      LIS_INTEGER my_rank,nprocs
      LIS_INTEGER matrix_type,comm_world
      LIS_INTEGER omp_get_num_procs,omp_get_max_threads
      LIS_INTEGER n,gn,i
      LIS_INTEGER nsol,iter,len,rhs,iter_double,iter_quad
      real*8 time,itime,ptime,p_c_time,p_i_time
      LIS_REAL resid
      character*256 fname,solname,resname,argc
      character*20 solvername
      integer*4 iargc
      
      call lis_initialize(ierr) 

#ifdef USE_MPI
      call MPI_Comm_size(MPI_COMM_WORLD,nprocs,ierr)
      call MPI_Comm_rank(MPI_COMM_WORLD,my_rank,ierr)
#else
      nprocs  = 1
      my_rank = 0
#endif

      matrix_type = LIS_MATRIX_CSR
      comm_world = LIS_COMM_WORLD

      i = iargc()
      if( i.lt.4 ) then
         if( my_rank.eq.0 ) then
          write(*,*) 'Usage: test1f matrix_filename rhs_setting ',
     .              'solution_filename rhistory_filename [options]'
          call lis_finalize(ierr)
        endif
        stop
      endif
      call getarg(2,argc)
      if( argc.eq.'0' ) then
        rhs = 0
      elseif( argc.eq.'1' ) then
        rhs = 1
      elseif( argc.eq.'2' ) then
        rhs = 2
      else
        rhs = -1
      endif
      
      if (my_rank .eq. 0) then
         write(*,*) ''
         write(*,*) 'number of processes = ',nprocs
#ifdef _OPENMP
         write(*,*) 'max number of threads = ',omp_get_num_procs()
         write(*,*) 'number of threads = ', omp_get_max_threads()
#endif
      endif

! read matrix and vectors from file 
      call getarg(1,fname)
      call lis_matrix_create(comm_world,A,ierr)
      call CHKERR(ierr)
      call lis_vector_create(comm_world,b,ierr)
      call CHKERR(ierr)
      call lis_vector_create(comm_world,x,ierr)
      call CHKERR(ierr)
      call lis_matrix_set_type(A,matrix_type,ierr)
      call lis_input(A,b,x,fname,ierr)
      call CHKERR(ierr);

      call lis_vector_duplicate(b,u,ierr)

      call lis_matrix_get_size(A,n,gn,ierr)

      call CHKERR(ierr)
      call lis_vector_is_null(b,ierr)
      if( ierr.eq.LIS_TRUE ) then
        call lis_vector_destroy(b,ierr)
        call lis_vector_duplicate(A,b,ierr)
        call CHKERR(ierr)
        if( rhs.eq.0 ) then
          call lis_finalize(ierr)
          stop
        elseif( rhs.eq.1 ) then
          call lis_vector_set_all(1.0d0,b,ierr)
        else
          call lis_vector_set_all(1.0d0,u,ierr)
          call lis_matvec(A,u,b,ierr)
        endif
      endif
      if( rhs.eq.-1 ) then
        call getarg(2,fname)
        call lis_input_vector(b,fname,ierr)
        call CHKERR(ierr)
      endif

      call lis_vector_is_null(x,ierr)
      if( ierr.eq.LIS_TRUE ) then
        call lis_vector_destroy(x,ierr)
        call lis_vector_duplicate(u,x,ierr)
        call CHKERR(ierr)
      endif

      call lis_solver_create(solver,ierr)
      call CHKERR(ierr)
      call lis_solver_set_option('-print mem',solver,ierr)
      call lis_solver_set_optionC(solver,ierr)
      
      call lis_solve(A,b,x,solver,ierr)

      call CHKERR(ierr)

	call lis_solver_get_iterex(solver,iter,iter_double,iter_quad,
     .                           ierr)
	call lis_solver_get_timeex(solver,time,itime,ptime,
     .                           p_c_time,p_i_time,ierr)
	call lis_solver_get_residualnorm(solver,resid,ierr)
      call lis_solver_get_solver(solver,nsol,ierr)
      call lis_solver_get_solvername(nsol,solvername,ierr)

      if( my_rank.eq.0 ) then
        write(*,*) solvername,': number of iterations = ',iter
#ifndef LONG__DOUBLE
        write(*,*) solvername,':   double             = ',
     .       iter_double
        write(*,*) solvername,':   quad               = ',iter_quad
#endif
        write(*,*) solvername,': elapsed time         = ',time
        write(*,*) solvername,':   preconditioner     = ',ptime
        write(*,*) solvername,':     matrix creation  = ',p_c_time
        write(*,*) solvername,':   linear solver      = ',itime
        write(*,*) solvername,': residual             = ',resid
      endif

! write solution 
      call getarg(3,solname)
	call lis_output_vector(x,LIS_FMT_MM,solname,ierr);

! write residual 
      call getarg(4,resname)
      call lis_solver_output_rhistory(solver, resname, ierr)

      call lis_solver_destroy(solver,ierr)
      call lis_vector_destroy(u,ierr)
      call lis_vector_destroy(x,ierr)
      call lis_vector_destroy(b,ierr)
      call lis_matrix_destroy(A,ierr)

      call lis_finalize(ierr)

      stop
      end
      
