test.F90 30.3 KB
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!    This file is part of ELPA.
!
!    The ELPA library was originally created by the ELPA consortium,
!    consisting of the following organizations:
!
!    - Max Planck Computing and Data Facility (MPCDF), formerly known as
!      Rechenzentrum Garching der Max-Planck-Gesellschaft (RZG),
!    - Bergische Universität Wuppertal, Lehrstuhl für angewandte
!      Informatik,
!    - Technische Universität München, Lehrstuhl für Informatik mit
!      Schwerpunkt Wissenschaftliches Rechnen ,
!    - Fritz-Haber-Institut, Berlin, Abt. Theorie,
!    - Max-Plack-Institut für Mathematik in den Naturwissenschaften,
!      Leipzig, Abt. Komplexe Strukutren in Biologie und Kognition,
!      and
!    - IBM Deutschland GmbH
!
!
!    More information can be found here:
!    http://elpa.mpcdf.mpg.de/
!
!    ELPA is free software: you can redistribute it and/or modify
!    it under the terms of the version 3 of the license of the
!    GNU Lesser General Public License as published by the Free
!    Software Foundation.
!
!    ELPA is distributed in the hope that it will be useful,
!    but WITHOUT ANY WARRANTY; without even the implied warranty of
!    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
!    GNU Lesser General Public License for more details.
!
!    You should have received a copy of the GNU Lesser General Public License
!    along with ELPA.  If not, see <http://www.gnu.org/licenses/>
!
!    ELPA reflects a substantial effort on the part of the original
!    ELPA consortium, and we ask you to respect the spirit of the
!    license that we chose: i.e., please contribute any changes you
!    may have back to the original ELPA library distribution, and keep
!    any derivatives of ELPA under the same license that we chose for
!    the original distribution, the GNU Lesser General Public License.
!
!
#include "config-f90.h"

! Define one of TEST_REAL or TEST_COMPLEX
! Define one of TEST_SINGLE or TEST_DOUBLE
! Define one of TEST_SOLVER_1STAGE or TEST_SOLVER_2STAGE
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! Define TEST_NVIDIA_GPU \in [0, 1]
! Define TEST_INTEL_GPU \in [0, 1]
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! Define TEST_AMD_GPU \in [0, 1]
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! Define either TEST_ALL_KERNELS or a TEST_KERNEL \in [any valid kernel]
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#if !(defined(TEST_REAL) ^ defined(TEST_COMPLEX))
error: define exactly one of TEST_REAL or TEST_COMPLEX
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#endif

#if !(defined(TEST_SINGLE) ^ defined(TEST_DOUBLE))
error: define exactly one of TEST_SINGLE or TEST_DOUBLE
#endif

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#if !(defined(TEST_SOLVER_1STAGE) ^ defined(TEST_SOLVER_2STAGE) ^ defined(TEST_SCALAPACK_ALL) ^ defined(TEST_SCALAPACK_PART))
error: define exactly one of TEST_SOLVER_1STAGE or TEST_SOLVER_2STAGE or TEST_SCALAPACK_ALL or TEST_SCALAPACK_PART
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#endif

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#ifdef TEST_SOLVER_1STAGE
#ifdef TEST_ALL_KERNELS
error: TEST_ALL_KERNELS cannot be defined for TEST_SOLVER_1STAGE
#endif
#ifdef TEST_KERNEL
error: TEST_KERNEL cannot be defined for TEST_SOLVER_1STAGE
#endif
#endif

#ifdef TEST_SOLVER_2STAGE
#if !(defined(TEST_KERNEL) ^ defined(TEST_ALL_KERNELS))
error: define either TEST_ALL_KERNELS or a valid TEST_KERNEL
#endif
#endif

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#ifdef TEST_GENERALIZED_DECOMP_EIGENPROBLEM
#define TEST_GENERALIZED_EIGENPROBLEM
#endif
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#ifdef TEST_SINGLE
#  define EV_TYPE real(kind=C_FLOAT)
#  ifdef TEST_REAL
#    define MATRIX_TYPE real(kind=C_FLOAT)
#  else
#    define MATRIX_TYPE complex(kind=C_FLOAT_COMPLEX)
#  endif
#else
#  define EV_TYPE real(kind=C_DOUBLE)
#  ifdef TEST_REAL
#    define MATRIX_TYPE real(kind=C_DOUBLE)
#  else
#    define MATRIX_TYPE complex(kind=C_DOUBLE_COMPLEX)
#  endif
#endif

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#ifdef TEST_REAL
#define KERNEL_KEY "real_kernel"
#endif
#ifdef TEST_COMPLEX
#define KERNEL_KEY "complex_kernel"
#endif

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#ifdef HAVE_64BIT_INTEGER_MATH_SUPPORT
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#define TEST_INT_TYPE integer(kind=c_int64_t)
#define INT_TYPE c_int64_t
#else
#define TEST_INT_TYPE integer(kind=c_int32_t)
#define INT_TYPE c_int32_t
#endif
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#ifdef HAVE_64BIT_INTEGER_MPI_SUPPORT
#define TEST_INT_MPI_TYPE integer(kind=c_int64_t)
#define INT_MPI_TYPE c_int64_t
#else
#define TEST_INT_MPI_TYPE integer(kind=c_int32_t)
#define INT_MPI_TYPE c_int32_t
#endif
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#define TEST_GPU 0
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#if (TEST_NVIDIA_GPU == 1) || (TEST_AMD_GPU == 1) || (TEST_INTEL_GPU == 1)
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#undef TEST_GPU
#define TEST_GPU 1
#endif

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#include "assert.h"

program test
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   use elpa 
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   !use test_util
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   use test_setup_mpi
   use test_prepare_matrix
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   use test_read_input_parameters
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   use test_blacs_infrastructure
   use test_check_correctness
   use test_analytic
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#ifdef WITH_SCALAPACK_TESTS
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   use test_scalapack
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#endif
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#ifdef HAVE_REDIRECT
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   use test_redirect
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#endif
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#ifdef WITH_OPENMP_TRADITIONAL
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   use omp_lib
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#endif
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   use precision_for_tests
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   implicit none

   ! matrix dimensions
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   TEST_INT_TYPE     :: na, nev, nblk
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   ! mpi
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   TEST_INT_TYPE     :: myid, nprocs
   TEST_INT_MPI_TYPE :: myidMPI, nprocsMPI
   TEST_INT_TYPE     :: na_cols, na_rows  ! local matrix size
   TEST_INT_TYPE     :: np_cols, np_rows  ! number of MPI processes per column/row
   TEST_INT_TYPE     :: my_prow, my_pcol  ! local MPI task position (my_prow, my_pcol) in the grid (0..np_cols -1, 0..np_rows -1)
   TEST_INT_MPI_TYPE :: mpierr
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   ! blacs
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   TEST_INT_TYPE     :: my_blacs_ctxt, sc_desc(9), info, nprow, npcol
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   ! The Matrix
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   MATRIX_TYPE, allocatable    :: a(:,:), as(:,:)
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#if defined(TEST_HERMITIAN_MULTIPLY)
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   MATRIX_TYPE, allocatable    :: b(:,:), c(:,:)
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#endif
#if defined(TEST_GENERALIZED_EIGENPROBLEM)
   MATRIX_TYPE, allocatable    :: b(:,:), bs(:,:)
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#endif
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   ! eigenvectors
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   MATRIX_TYPE, allocatable    :: z(:,:)
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   ! eigenvalues
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   EV_TYPE, allocatable        :: ev(:)
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   logical                     :: check_all_evals, skip_check_correctness
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#if defined(TEST_MATRIX_TOEPLITZ) || defined(TEST_MATRIX_FRANK)
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   EV_TYPE, allocatable        :: d(:), sd(:), ds(:), sds(:)
   EV_TYPE                     :: diagonalELement, subdiagonalElement
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#endif
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   TEST_INT_TYPE               :: status
   integer(kind=c_int)         :: error_elpa
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   type(output_t)              :: write_to_file
   class(elpa_t), pointer      :: e
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#ifdef TEST_ALL_KERNELS
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   TEST_INT_TYPE      :: i
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#endif
#ifdef TEST_ALL_LAYOUTS
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   TEST_INT_TYPE      :: i_layout
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#ifdef BUILD_FUGAKU
   character(len=1) :: layouts(2)
#else
   character(len=1), parameter :: layouts(2) = [ 'C', 'R' ]
#endif
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#endif
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   integer(kind=c_int):: kernel
   character(len=1)   :: layout
   logical            :: do_test_numeric_residual, do_test_numeric_residual_generalized, &
                         do_test_analytic_eigenvalues, &
                         do_test_analytic_eigenvalues_eigenvectors,   &
                         do_test_frank_eigenvalues,  &
                         do_test_toeplitz_eigenvalues, do_test_cholesky,   &
                         do_test_hermitian_multiply
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   logical            :: ignoreError
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#ifdef WITH_OPENMP_TRADITIONAL
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   TEST_INT_TYPE      :: max_threads, threads_caller
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#endif
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#if TEST_GPU_SET_ID == 1
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   TEST_INT_TYPE      :: gpuID
#endif
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#ifdef SPLIT_COMM_MYSELF
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   TEST_INT_MPI_TYPE  :: mpi_comm_rows, mpi_comm_cols, mpi_string_length, mpierr2
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   character(len=MPI_MAX_ERROR_STRING) :: mpierr_string
#endif

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#ifdef TEST_ALL_LAYOUTS
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#ifdef BUILD_FUGAKU
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   layouts(1) = 'C'
   layouts(2) = 'R'
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#endif
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#endif

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   ignoreError = .false.

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   call read_input_parameters_traditional(na, nev, nblk, write_to_file, skip_check_correctness)
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   call setup_mpi(myid, nprocs)
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#ifdef HAVE_REDIRECT
#ifdef WITH_MPI
     call MPI_BARRIER(MPI_COMM_WORLD, mpierr)
     call redirect_stdout(myid)
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#endif
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#endif
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   check_all_evals = .true.
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   do_test_numeric_residual = .false.
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   do_test_numeric_residual_generalized = .false.
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   do_test_analytic_eigenvalues = .false.
   do_test_analytic_eigenvalues_eigenvectors = .false.
   do_test_frank_eigenvalues = .false.
   do_test_toeplitz_eigenvalues = .false. 

   do_test_cholesky = .false.
#if defined(TEST_CHOLESKY)
   do_test_cholesky = .true.
#endif
   do_test_hermitian_multiply = .false.
#if defined(TEST_HERMITIAN_MULTIPLY)
   do_test_hermitian_multiply = .true.
#endif

   status = 0
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   if (elpa_init(CURRENT_API_VERSION) /= ELPA_OK) then
     print *, "ELPA API version not supported"
     stop 1
   endif

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   if (myid == 0) then
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     print '((a,i0))', 'Program ' &
     // TEST_CASE
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     print *, ""
   endif

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#ifdef TEST_ALL_LAYOUTS
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   do i_layout = 1, size(layouts)               ! layouts
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     layout = layouts(i_layout)
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     do np_cols = 1, nprocs                     ! factors
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       if (mod(nprocs,np_cols) /= 0 ) then
         cycle
       endif
#else
   layout = 'C'
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   do np_cols = NINT(SQRT(REAL(nprocs))),2,-1
      if(mod(nprocs,np_cols) == 0 ) exit
   enddo
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#endif
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   np_rows = nprocs/np_cols
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   assert(nprocs == np_rows * np_cols)
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   if (myid == 0) then
     print '((a,i0))', 'Matrix size: ', na
     print '((a,i0))', 'Num eigenvectors: ', nev
     print '((a,i0))', 'Blocksize: ', nblk
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#ifdef WITH_MPI
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     print '((a,i0))', 'Num MPI proc: ', nprocs
     print '(3(a,i0))','Number of processor rows=',np_rows,', cols=',np_cols,', total=',nprocs
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     print '(a)',      'Process layout: ' // layout
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#endif
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     print *,''
   endif

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#if TEST_QR_DECOMPOSITION == 1
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#if (TEST_NVIDIA_GPU == 1) || (TEST_INTEL_GPU == 1) || (TEST_AMD_GPU == 1)
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#ifdef WITH_MPI
     call mpi_finalize(mpierr)
#endif
     stop 77
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#endif /* TEST_NVIDIA_GPU || TEST_INTEL_GPU */
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   if (nblk .lt. 64) then
     if (myid .eq. 0) then
       print *,"At the moment QR decomposition need blocksize of at least 64"
     endif
     if ((na .lt. 64) .and. (myid .eq. 0)) then
       print *,"This is why the matrix size must also be at least 64 or only 1 MPI task can be used"
     endif

#ifdef WITH_MPI
     call mpi_finalize(mpierr)
#endif
     stop 77
   endif
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#endif /* TEST_QR_DECOMPOSITION */

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   call set_up_blacsgrid(int(mpi_comm_world,kind=BLAS_KIND), np_rows, &
                         np_cols, layout, my_blacs_ctxt, my_prow, &
                         my_pcol)
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#if defined(TEST_GENERALIZED_EIGENPROBLEM) && defined(TEST_ALL_LAYOUTS)
#ifdef WITH_MPI
     call mpi_finalize(mpierr)
#endif
     stop 77
#endif


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   call set_up_blacs_descriptor(na, nblk, my_prow, my_pcol, &
                                np_rows, np_cols, &
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                                na_rows, na_cols, sc_desc, my_blacs_ctxt, info)
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   allocate(a (na_rows,na_cols))
   allocate(as(na_rows,na_cols))
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   allocate(z (na_rows,na_cols))
   allocate(ev(na))

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#ifdef TEST_HERMITIAN_MULTIPLY
   allocate(b (na_rows,na_cols))
   allocate(c (na_rows,na_cols))
#endif

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#ifdef TEST_GENERALIZED_EIGENPROBLEM
   allocate(b (na_rows,na_cols))
   allocate(bs (na_rows,na_cols))
#endif

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#if defined(TEST_MATRIX_TOEPLITZ) || defined(TEST_MATRIX_FRANK)
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   allocate(d (na), ds(na))
   allocate(sd (na), sds(na))
#endif

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   a(:,:) = 0.0
   z(:,:) = 0.0
   ev(:) = 0.0

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#if defined(TEST_MATRIX_RANDOM) && !defined(TEST_SOLVE_TRIDIAGONAL) && !defined(TEST_CHOLESKY) && !defined(TEST_EIGENVALUES)
   ! the random matrix can be used in allmost all tests; but for some no
   ! correctness checks have been implemented; do not allow these
   ! combinations
   ! RANDOM + TEST_SOLVE_TRIDIAGONAL: we need a TOEPLITZ MATRIX
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   ! RANDOM + TEST_CHOLESKY: wee need SPD matrix
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   ! RANDOM + TEST_EIGENVALUES: no correctness check known

   ! We also have to take care of special case in TEST_EIGENVECTORS
#if !defined(TEST_EIGENVECTORS)
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    call prepare_matrix_random(na, myid, sc_desc, a, z, as)
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#else /* TEST_EIGENVECTORS */
    if (nev .ge. 1) then
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      call prepare_matrix_random(na, myid, sc_desc, a, z, as)
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#ifndef TEST_HERMITIAN_MULTIPLY
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      do_test_numeric_residual = .true.
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#endif
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   else
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     if (myid .eq. 0) then
       print *,"At the moment with the random matrix you need nev >=1"
     endif
#ifdef WITH_MPI
     call mpi_finalize(mpierr)
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#endif
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     stop 77
   endif
#endif /* TEST_EIGENVECTORS */
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    do_test_analytic_eigenvalues = .false.
    do_test_analytic_eigenvalues_eigenvectors = .false.
    do_test_frank_eigenvalues = .false.
    do_test_toeplitz_eigenvalues = .false.
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#endif /* (TEST_MATRIX_RANDOM) */
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#if defined(TEST_MATRIX_RANDOM) && defined(TEST_CHOLESKY)
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     call prepare_matrix_random_spd(na, myid, sc_desc, a, z, as, &
                 nblk, np_rows, np_cols, my_prow, my_pcol)
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    do_test_analytic_eigenvalues = .false.
    do_test_analytic_eigenvalues_eigenvectors = .false.
    do_test_frank_eigenvalues = .false.
    do_test_toeplitz_eigenvalues = .false.
#endif /* TEST_MATRIX_RANDOM and TEST_CHOLESKY */

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#if defined(TEST_MATRIX_RANDOM) && defined(TEST_GENERALIZED_EIGENPROBLEM)
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   ! call prepare_matrix_random(na, myid, sc_desc, a, z, as)
    call prepare_matrix_random_spd(na, myid, sc_desc, b, z, bs, &
                 nblk, np_rows, np_cols, my_prow, my_pcol)
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    do_test_analytic_eigenvalues = .false.
    do_test_analytic_eigenvalues_eigenvectors = .false.
    do_test_frank_eigenvalues = .false.
    do_test_toeplitz_eigenvalues = .false.
    do_test_numeric_residual = .false.
    do_test_numeric_residual_generalized = .true.
#endif /* TEST_MATRIX_RANDOM and TEST_GENERALIZED_EIGENPROBLEM */

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#if defined(TEST_MATRIX_RANDOM) && (defined(TEST_SOLVE_TRIDIAGONAL) || defined(TEST_EIGENVALUES))
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#error "Random matrix is not allowed in this configuration"
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#endif
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#if defined(TEST_MATRIX_ANALYTIC)  && !defined(TEST_SOLVE_TRIDIAGONAL) && !defined(TEST_CHOLESKY)
   ! the analytic matrix can be used in allmost all tests; but for some no
   ! correctness checks have been implemented; do not allow these
   ! combinations
   ! ANALYTIC + TEST_SOLVE_TRIDIAGONAL: we need a TOEPLITZ MATRIX
   ! ANALTIC  + TEST_CHOLESKY: no correctness check yet implemented
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   call prepare_matrix_analytic(na, a, nblk, myid, np_rows, np_cols, my_prow, my_pcol)
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   as(:,:) = a
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   do_test_numeric_residual = .false.
   do_test_analytic_eigenvalues_eigenvectors = .false.
#ifndef TEST_HERMITIAN_MULTIPLY
   do_test_analytic_eigenvalues = .true.
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#endif
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#if defined(TEST_EIGENVECTORS)
   if (nev .ge. 1) then
     do_test_analytic_eigenvalues_eigenvectors = .true.
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     do_test_analytic_eigenvalues = .false.
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   else
     do_test_analytic_eigenvalues_eigenvectors = .false.
   endif
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#endif
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   do_test_frank_eigenvalues = .false.
   do_test_toeplitz_eigenvalues = .false.
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#endif /* TEST_MATRIX_ANALYTIC */
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#if defined(TEST_MATRIX_ANALYTIC) && (defined(TEST_SOLVE_TRIDIAGONAL) || defined(TEST_CHOLESKY))
#error "Analytic matrix is not allowd in this configuration"
#endif
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#if defined(TEST_MATRIX_TOEPLITZ)
   ! The Toeplitz matrix works in each test
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#ifdef TEST_SINGLE
   diagonalElement = 0.45_c_float
   subdiagonalElement =  0.78_c_float
#else
   diagonalElement = 0.45_c_double
   subdiagonalElement =  0.78_c_double
#endif
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! actually we test cholesky for diagonal matrix only
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#if defined(TEST_CHOLESKY)
#ifdef TEST_SINGLE
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  diagonalElement = (2.546_c_float, 0.0_c_float)
  subdiagonalElement =  (0.0_c_float, 0.0_c_float)
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#else
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  diagonalElement = (2.546_c_double, 0.0_c_double)
  subdiagonalElement =  (0.0_c_double, 0.0_c_double)
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#endif
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#endif /* TEST_CHOLESKY */

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   ! check first whether to abort
   if (na < 10) then
#ifdef WITH_MPI
     call mpi_finalize(mpierr)
#endif
     stop 77
   endif
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   call prepare_matrix_toeplitz(na, diagonalElement, subdiagonalElement, &
                                d, sd, ds, sds, a, as, nblk, np_rows, &
                                np_cols, my_prow, my_pcol)
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   do_test_numeric_residual = .false.
#if defined(TEST_EIGENVECTORS)
   if (nev .ge. 1) then
     do_test_numeric_residual = .true.
   else
     do_test_numeric_residual = .false.
   endif
#endif

   do_test_analytic_eigenvalues = .false.
   do_test_analytic_eigenvalues_eigenvectors = .false.
   do_test_frank_eigenvalues = .false.
#if defined(TEST_CHOLESKY)
   do_test_toeplitz_eigenvalues = .false.
#else
   do_test_toeplitz_eigenvalues = .true.
#endif
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#endif /* TEST_MATRIX_TOEPLITZ */


#if defined(TEST_MATRIX_FRANK) && !defined(TEST_SOLVE_TRIDIAGONAL) && !defined(TEST_CHOLESKY)
   ! the random matrix can be used in allmost all tests; but for some no
   ! correctness checks have been implemented; do not allow these
   ! combinations
   ! FRANK + TEST_SOLVE_TRIDIAGONAL: we need a TOEPLITZ MATRIX
   ! FRANK + TEST_CHOLESKY: no correctness check yet implemented

   ! We also have to take care of special case in TEST_EIGENVECTORS
#if !defined(TEST_EIGENVECTORS)
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    call prepare_matrix_frank(na, a, z, as, nblk, np_rows, np_cols, my_prow, my_pcol)
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    do_test_analytic_eigenvalues = .false.
    do_test_analytic_eigenvalues_eigenvectors = .false.
#ifndef TEST_HERMITIAN_MULTIPLY
    do_test_frank_eigenvalues = .true.
#endif
    do_test_toeplitz_eigenvalues = .false.

#else /* TEST_EIGENVECTORS */

    if (nev .ge. 1) then
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      call prepare_matrix_frank(na, a, z, as, nblk, np_rows, np_cols, my_prow, my_pcol)
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    do_test_analytic_eigenvalues = .false.
    do_test_analytic_eigenvalues_eigenvectors = .false.
#ifndef TEST_HERMITIAN_MULTIPLY
    do_test_frank_eigenvalues = .true.
#endif
    do_test_toeplitz_eigenvalues = .false.
    do_test_numeric_residual = .false.
   else
    do_test_analytic_eigenvalues = .false.
    do_test_analytic_eigenvalues_eigenvectors = .false.
#ifndef TEST_HERMITIAN_MULTIPLY
    do_test_frank_eigenvalues = .true.
#endif
    do_test_toeplitz_eigenvalues = .false.
    do_test_numeric_residual = .false.

   endif

#endif /* TEST_EIGENVECTORS */
#endif /* (TEST_MATRIX_FRANK) */
#if defined(TEST_MATRIX_FRANK) && (defined(TEST_SOLVE_TRIDIAGONAL) || defined(TEST_CHOLESKY))
#error "FRANK matrix is not allowed in this configuration"
#endif


#ifdef TEST_HERMITIAN_MULTIPLY
#ifdef TEST_REAL

#ifdef TEST_DOUBLE
   b(:,:) = 2.0_c_double * a(:,:)
   c(:,:) = 0.0_c_double
#else
   b(:,:) = 2.0_c_float * a(:,:)
   c(:,:) = 0.0_c_float
#endif

#endif /* TEST_REAL */

#ifdef TEST_COMPLEX

#ifdef TEST_DOUBLE
   b(:,:) = 2.0_c_double * a(:,:)
   c(:,:) = (0.0_c_double, 0.0_c_double)
#else
   b(:,:) = 2.0_c_float * a(:,:)
   c(:,:) = (0.0_c_float, 0.0_c_float)
#endif

#endif /* TEST_COMPLEX */

#endif /* TEST_HERMITIAN_MULTIPLY */
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! if the test is used for (repeated) performacne tests, one might want to skip the checking
! of the results, which might be time-consuming and not necessary.
   if(skip_check_correctness) then
     do_test_numeric_residual = .false.
     do_test_numeric_residual_generalized = .false.
     do_test_analytic_eigenvalues = .false.
     do_test_analytic_eigenvalues_eigenvectors = .false.
     do_test_frank_eigenvalues = .false.
     do_test_toeplitz_eigenvalues = .false. 
     do_test_cholesky = .false.
   endif

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#ifdef WITH_OPENMP_TRADITIONAL
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   threads_caller = omp_get_max_threads()
   if (myid == 0) then
     print *,"The calling program uses ",threads_caller," threads"
   endif
#endif

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   e => elpa_allocate(error_elpa)
   assert_elpa_ok(error_elpa)
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   call e%set("na", int(na,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
   call e%set("nev", int(nev,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
   call e%set("local_nrows", int(na_rows,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
   call e%set("local_ncols", int(na_cols,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
   call e%set("nblk", int(nblk,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
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   if (layout .eq. 'C') then
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     call e%set("matrix_order",COLUMN_MAJOR_ORDER,error_elpa)
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   else
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     call e%set("matrix_order",ROW_MAJOR_ORDER,error_elpa)
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   endif

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#ifdef WITH_MPI
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#ifdef SPLIT_COMM_MYSELF
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   call mpi_comm_split(MPI_COMM_WORLD, int(my_pcol,kind=MPI_KIND), int(my_prow,kind=MPI_KIND), &
                       mpi_comm_rows, mpierr)
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   if (mpierr .ne. MPI_SUCCESS) then
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     call MPI_ERROR_STRING(mpierr, mpierr_string, mpi_string_length, mpierr2)
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     write(error_unit,*) "MPI ERROR occured during mpi_comm_split for row communicator: ", trim(mpierr_string)
     stop 1
   endif

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   call mpi_comm_split(MPI_COMM_WORLD, int(my_prow,kind=MPI_KIND), int(my_pcol,kind=MPI_KIND), &
                       mpi_comm_cols, mpierr)
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   if (mpierr .ne. MPI_SUCCESS) then
     call MPI_ERROR_STRING(mpierr,mpierr_string, mpi_string_length, mpierr2)
     write(error_unit,*) "MPI ERROR occured during mpi_comm_split for col communicator: ", trim(mpierr_string)
     stop 1
   endif

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   call e%set("mpi_comm_parent", int(MPI_COMM_WORLD,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
   call e%set("mpi_comm_rows", int(mpi_comm_rows,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
   call e%set("mpi_comm_cols", int(mpi_comm_cols,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
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#else
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   call e%set("mpi_comm_parent", int(MPI_COMM_WORLD,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
   call e%set("process_row", int(my_prow,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
   call e%set("process_col", int(my_pcol,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
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   call e%set("verbose", 1, error_elpa)
   assert_elpa_ok(error_elpa)
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#endif
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#endif
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#ifdef TEST_GENERALIZED_EIGENPROBLEM
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   call e%set("blacs_context", int(my_blacs_ctxt,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
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#endif
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   call e%set("timings", 1_ik, error_elpa)
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   assert_elpa_ok(e%setup())

#ifdef TEST_SOLVER_1STAGE
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   call e%set("solver", ELPA_SOLVER_1STAGE, error_elpa)
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#else
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   call e%set("solver", ELPA_SOLVER_2STAGE, error_elpa)
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#endif
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   assert_elpa_ok(error_elpa)
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#if TEST_NVIDIA_GPU == 1 || (TEST_NVIDIA_GPU == 0) && (TEST_AMD_GPU == 0) && (TEST_INTEL_GPU == 0)
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   call e%set("nvidia-gpu", TEST_GPU, error_elpa)
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   assert_elpa_ok(error_elpa)
#endif
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#if TEST_AMD_GPU == 1
   call e%set("amd-gpu", TEST_GPU, error_elpa)
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   assert_elpa_ok(error_elpa)
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#endif
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#if TEST_INTEL_GPU == 1
   call e%set("intel-gpu", TEST_GPU, error_elpa)
   assert_elpa_ok(error_elpa)
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#endif
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#if (TEST_GPU_SET_ID == 1) && (TEST_INTEL_GPU == 0)
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   ! simple test
   ! Can (and should) fail often
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   !gpuID = mod(myid,2)
   gpuID = mod(myid,1)
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   print *,"Task",myid,"wants to use GPU",gpuID
   call e%set("use_gpu_id", int(gpuID,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
#endif


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#if TEST_QR_DECOMPOSITION == 1
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   call e%set("qr", 1_ik, error_elpa)
   assert_elpa_ok(error_elpa)
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#endif

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#ifdef WITH_OPENMP_TRADITIONAL
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   max_threads=omp_get_max_threads()
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   call e%set("omp_threads", int(max_threads,kind=c_int), error_elpa)
   assert_elpa_ok(error_elpa)
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#endif

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   if (myid == 0) print *, ""

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#ifdef TEST_ALL_KERNELS
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   do i = 0, elpa_option_cardinality(KERNEL_KEY)  ! kernels
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#if (TEST_NVIDIA_GPU == 0) && (TEST_INTEL_GPU == 0) && (TEST_AMD_GPU == 0)
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     !if (TEST_GPU .eq. 0) then
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       kernel = elpa_option_enumerate(KERNEL_KEY, int(i,kind=c_int))
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       if (kernel .eq. ELPA_2STAGE_REAL_NVIDIA_GPU) continue
       if (kernel .eq. ELPA_2STAGE_COMPLEX_NVIDIA_GPU) continue
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       if (kernel .eq. ELPA_2STAGE_REAL_AMD_GPU) continue
       if (kernel .eq. ELPA_2STAGE_COMPLEX_AMD_GPU) continue
       if (kernel .eq. ELPA_2STAGE_REAL_INTEL_GPU) continue
       if (kernel .eq. ELPA_2STAGE_COMPLEX_INTEL_GPU) continue
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     !endif
#endif
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#endif
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#ifdef TEST_KERNEL
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     kernel = TEST_KERNEL
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#endif
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#ifdef TEST_SOLVER_2STAGE
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#if TEST_NVIDIA_GPU == 1
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#if defined TEST_REAL
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#if (TEST_NVIDIA_GPU == 1)
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     kernel = ELPA_2STAGE_REAL_NVIDIA_GPU
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#endif
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#if (TEST_AMD_GPU == 1)
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     kernel = ELPA_2STAGE_REAL_AMD_GPU
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#endif
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#if (TEST_INTEL_GPU == 1)
     kernel = ELPA_2STAGE_REAL_INTEL_GPU
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#endif
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#endif /* TEST_REAL */
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#if defined TEST_COMPLEX
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#if (TEST_NVIDIA_GPU == 1)
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     kernel = ELPA_2STAGE_COMPLEX_NVIDIA_GPU
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#endif
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#if (TEST_AMD_GPU == 1)
     kernel = ELPA_2STAGE_COMPLEX_AMD_GPU
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#endif
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#if (TEST_INTEL_GPU == 1)
     kernel = ELPA_2STAGE_COMPLEX_INTEL_GPU
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#endif
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#endif /* TEST_COMPLEX */
#endif /* TEST_GPU == 1 */
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     call e%set(KERNEL_KEY, kernel, error_elpa)
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#ifdef TEST_KERNEL
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     assert_elpa_ok(error_elpa)
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#else
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     if (error_elpa /= ELPA_OK) then
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       cycle
     endif
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     ! actually used kernel might be different if forced via environment variables
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     call e%get(KERNEL_KEY, kernel, error_elpa)
     assert_elpa_ok(error_elpa)
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#endif
     if (myid == 0) then
       print *, elpa_int_value_to_string(KERNEL_KEY, kernel) // " kernel"
     endif
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#endif

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#if !defined(TEST_ALL_LAYOUTS)
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! print all parameters
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     call e%print_settings(error_elpa)
     assert_elpa_ok(error_elpa)
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#endif
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#ifdef TEST_ALL_KERNELS
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     call e%timer_start(elpa_int_value_to_string(KERNEL_KEY, kernel))
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#endif
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     ! The actual solve step
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#if defined(TEST_EIGENVECTORS)
#if TEST_QR_DECOMPOSITION == 1
     call e%timer_start("e%eigenvectors_qr()")
#else
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     call e%timer_start("e%eigenvectors()")
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#endif
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#ifdef TEST_SCALAPACK_ALL
     call solve_scalapack_all(na, a, sc_desc, ev, z)
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#elif TEST_SCALAPACK_PART
     call solve_scalapack_part(na, a, sc_desc, nev, ev, z)
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     check_all_evals = .false. ! scalapack does not compute all eigenvectors
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#else
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     call e%eigenvectors(a, ev, z, error_elpa)
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#endif
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#if TEST_QR_DECOMPOSITION == 1
     call e%timer_stop("e%eigenvectors_qr()")
#else
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     call e%timer_stop("e%eigenvectors()")
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#endif
#endif /* TEST_EIGENVECTORS  */
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#ifdef TEST_EIGENVALUES
     call e%timer_start("e%eigenvalues()")
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     call e%eigenvalues(a, ev, error_elpa)
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     call e%timer_stop("e%eigenvalues()")
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#endif
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#if defined(TEST_SOLVE_TRIDIAGONAL)
     call e%timer_start("e%solve_tridiagonal()")
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     call e%solve_tridiagonal(d, sd, z, error_elpa)
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     call e%timer_stop("e%solve_tridiagonal()")
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     ev(:) = d(:)
#endif

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#if defined(TEST_CHOLESKY)
     call e%timer_start("e%cholesky()")
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     call e%cholesky(a, error_elpa)
     assert_elpa_ok(error_elpa)
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     call e%timer_stop("e%cholesky()")
#endif

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#if defined(TEST_HERMITIAN_MULTIPLY)
     call e%timer_start("e%hermitian_multiply()")
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     call e%hermitian_multiply('F','F', int(na,kind=c_int), a, b, int(na_rows,kind=c_int), &
                               int(na_cols,kind=c_int), c, int(na_rows,kind=c_int),        &
                               int(na_cols,kind=c_int), error_elpa)
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     call e%timer_stop("e%hermitian_multiply()")
#endif
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#if defined(TEST_GENERALIZED_EIGENPROBLEM)
     call e%timer_start("e%generalized_eigenvectors()")
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#if defined(TEST_GENERALIZED_DECOMP_EIGENPROBLEM)
     call e%timer_start("is_already_decomposed=.false.")
#endif
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     call e%generalized_eigenvectors(a, b, ev, z, .false., error_elpa)
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#if defined(TEST_GENERALIZED_DECOMP_EIGENPROBLEM)
     call e%timer_stop("is_already_decomposed=.false.")
     a = as
     call e%timer_start("is_already_decomposed=.true.")
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     call e%generalized_eigenvectors(a, b, ev, z, .true., error_elpa)
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     call e%timer_stop("is_already_decomposed=.true.")
#endif
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     call e%timer_stop("e%generalized_eigenvectors()")
#endif

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     assert_elpa_ok(error_elpa)
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#ifdef TEST_ALL_KERNELS
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     call e%timer_stop(elpa_int_value_to_string(KERNEL_KEY, kernel))
#endif

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     if (myid .eq. 0) then
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#ifdef TEST_ALL_KERNELS
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       call e%print_times(elpa_int_value_to_string(KERNEL_KEY, kernel))
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#else /* TEST_ALL_KERNELS */

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#if defined(TEST_EIGENVECTORS)
#if TEST_QR_DECOMPOSITION == 1
       call e%print_times("e%eigenvectors_qr()")
#else
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       call e%print_times("e%eigenvectors()")
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#endif
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#endif
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#ifdef TEST_EIGENVALUES
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       call e%print_times("e%eigenvalues()")
#endif
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#ifdef TEST_SOLVE_TRIDIAGONAL
       call e%print_times("e%solve_tridiagonal()")
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#endif
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#ifdef TEST_CHOLESKY
       call e%print_times("e%cholesky()")
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#endif
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#ifdef TEST_HERMITIAN_MULTIPLY
       call e%print_times("e%hermitian_multiply()")
#endif
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#ifdef TEST_GENERALIZED_EIGENPROBLEM
      call e%print_times("e%generalized_eigenvectors()")
#endif
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#endif /* TEST_ALL_KERNELS */
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     endif
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     if (do_test_analytic_eigenvalues) then
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       status = check_correctness_analytic(na, nev, ev, z, nblk, myid, np_rows, np_cols, &
                                           my_prow, my_pcol, check_all_evals, .false.)
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       call check_status(status, myid)
     endif

     if (do_test_analytic_eigenvalues_eigenvectors) then
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       status = check_correctness_analytic(na, nev, ev, z, nblk, myid, np_rows, np_cols, &
                                           my_prow, my_pcol, check_all_evals, .true.)
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       call check_status(status, myid)
     endif
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     if(do_test_numeric_residual) then
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       status = check_correctness_evp_numeric_residuals(na, nev, as, z, ev, sc_desc, nblk, myid, &
                                                        np_rows,np_cols, my_prow, my_pcol)
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       call check_status(status, myid)
     endif

     if (do_test_frank_eigenvalues) then
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       status = check_correctness_eigenvalues_frank(na, ev, z, myid)
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       call check_status(status, myid)
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     endif
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     if (do_test_toeplitz_eigenvalues) then
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#if defined(TEST_EIGENVALUES) || defined(TEST_SOLVE_TRIDIAGONAL)
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       status = check_correctness_eigenvalues_toeplitz(na, diagonalElement, &
                                                       subdiagonalElement, ev, z, myid)
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       call check_status(status, myid)
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#endif
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     endif
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     if (do_test_cholesky) then
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       status = check_correctness_cholesky(na, a, as, na_rows, sc_desc, myid )
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       call check_status(status, myid)
     endif
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#ifdef TEST_HERMITIAN_MULTIPLY
     if (do_test_hermitian_multiply) then
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       status = check_correctness_hermitian_multiply(na, a, b, c, na_rows, sc_desc, myid )
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       call check_status(status, myid)
     endif
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#endif
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#ifdef TEST_GENERALIZED_EIGENPROBLEM
     if(do_test_numeric_residual_generalized) then
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       status = check_correctness_evp_numeric_residuals(na, nev, as, z, ev, sc_desc, nblk, myid, np_rows, &
                                                        np_cols, my_prow, &
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       my_pcol, bs)
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       call check_status(status, myid)
     endif
#endif

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#ifdef WITH_OPENMP_TRADITIONAL
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     if (threads_caller .ne. omp_get_max_threads()) then
       if (myid .eq. 0) then
         print *, " ERROR! the number of OpenMP threads has not been restored correctly"
       endif
       status = 1
     endif
#endif
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     if (myid == 0) then
       print *, ""
     endif

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#ifdef TEST_ALL_KERNELS
     a(:,:) = as(:,:)
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#if defined(TEST_MATRIX_TOEPLITZ) || defined(TEST_MATRIX_FRANK)
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     d = ds
     sd = sds
#endif
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   end do ! kernels
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#endif
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   call elpa_deallocate(e, error_elpa)
   assert_elpa_ok(error_elpa)
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   deallocate(a)
   deallocate(as)
   deallocate(z)
   deallocate(ev)
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#ifdef TEST_HERMITIAN_MULTIPLY
   deallocate(b)
   deallocate(c)
#endif
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#if defined(TEST_MATRIX_TOEPLITZ) || defined(TEST_MATRIX_FRANK)
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   deallocate(d, ds)
   deallocate(sd, sds)
#endif
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#if defined(TEST_GENERALIZED_EIGENPROBLEM)
  deallocate(b, bs)
#endif
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#ifdef TEST_ALL_LAYOUTS
   end do ! factors
   end do ! layouts
#endif
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   call elpa_uninit(error_elpa)
   assert_elpa_ok(error_elpa)
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#ifdef WITH_MPI
   call blacs_gridexit(my_blacs_ctxt)
   call mpi_finalize(mpierr)
#endif
   call exit(status)

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   contains

     subroutine check_status(status, myid)
       implicit none
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       TEST_INT_TYPE, intent(in) :: status, myid
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       TEST_INT_MPI_TYPE         :: mpierr
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       if (status /= 0) then
         if (myid == 0) print *, "Result incorrect!"
#ifdef WITH_MPI
         call mpi_finalize(mpierr)
#endif
         call exit(status)
       endif
     end subroutine

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end program