C   Copyright (C) 2005 The Scalable Software Infrastructure Project. 
C   All rights reserved.
C
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C      notice, this list of conditions and the following disclaimer.
C   2. Redistributions in binary form must reproduce the above
C      copyright notice, this list of conditions and the following
C      disclaimer in the documentation and/or other materials provided
C      with the distribution.
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C      from this software without specific prior written permission.
C
C   THIS SOFTWARE IS PROVIDED BY THE SCALABLE SOFTWARE INFRASTRUCTURE
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      implicit none
      
#include "lisf.h"

      LIS_MATRIX A
      LIS_VECTOR x
      LIS_REAL evalue0
      LIS_ESOLVER esolver
      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,iter_double,iter_quad
      real*8 time,itime,ptime,p_c_time,p_i_time
      LIS_REAL resid
      character*256 fname,solname,resname
      character*20 esolvername
      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.3 ) then
        if( my_rank.eq.0 ) then
          write(*,*) 'etest1f matrix_filename ',
     .              'evector_filename rhistory_filename [options]'
          call lis_finalize(ierr)
        endif
        stop
      endif

      if (my_rank .eq. 0) then
         write(*,*) ''
         write(*,*) 'number of processes = ',nprocs
      endif


#ifdef _OPENMP
      write(*,*) 'max number of threads = ',omp_get_num_procs()
      write(*,*) 'number of threads = ', omp_get_max_threads()
#endif

! read matrix from file 
      call getarg(1,fname)
      call lis_matrix_create(comm_world,A,ierr)
      call CHKERR(ierr)
      call lis_matrix_set_type(A,matrix_type,ierr)
      call lis_input_matrix(A,fname,ierr)
      call CHKERR(ierr);
      call lis_matrix_get_size(A,n,gn,ierr)

      call lis_vector_duplicate(A,x,ierr)
#ifdef COMPLEX
      call lis_vector_set_all((1.0d0,0.0d0),x,ierr)
#else
      call lis_vector_set_all(1.0d0,x,ierr)
#endif      

      call lis_esolver_create(esolver,ierr)
      call CHKERR(ierr)
      call lis_esolver_set_option('-eprint mem',esolver,ierr)
      call lis_esolver_set_optionC(esolver,ierr)
      
      call lis_esolve(A,x,evalue0,esolver,ierr)
      call CHKERR(ierr)

      call lis_esolver_get_iterex(esolver,iter,iter_double,iter_quad,
     .     ierr)
      call lis_esolver_get_timeex(esolver,time,itime,ptime,
     .     p_c_time,p_i_time,ierr)
      call lis_esolver_get_residualnorm(esolver,resid,ierr)
      call lis_esolver_get_esolver(esolver,nsol,ierr)
      call lis_esolver_get_esolvername(nsol,esolvername,ierr)
	
      If( my_rank.eq.0 ) then
        write(*,*) esolvername,': mode number          = ',0
        write(*,*) esolvername,': eigenvalue           = ',evalue0
        write(*,*) esolvername,': number of iterations = ',iter
        write(*,*) esolvername,': elapsed time         = ',time
        write(*,*) esolvername,':   preconditioner     = ',ptime
        write(*,*) esolvername,':     matrix creation  = ',p_c_time
        write(*,*) esolvername,': linear solver        = ',itime
        write(*,*) esolvername,': residual             = ',resid
        write(*,*) 
      endif

! write eigenvector
      call getarg(2,solname)
      call lis_output_vector(x,LIS_FMT_MM,solname,ierr);

! write residual 
      call getarg(3,resname)
      call lis_esolver_output_rhistory(esolver, resname,ierr);

      call lis_esolver_destroy(esolver,ierr)
      call lis_matrix_destroy(A,ierr)
      call lis_vector_destroy(x,ierr)

      call lis_finalize(ierr)

      stop
      end
      
