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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
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     the original distribution, the GNU Lesser General Public License.
*/

#include "config.h"

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#include <stdio.h>
#include <stdlib.h>
#ifdef WITH_MPI
#include <mpi.h>
#endif
#include <math.h>

#include <elpa/elpa.h>
#include <assert.h>

#include "test/shared/generated.h"

#if !(defined(TEST_REAL) ^ defined(TEST_COMPLEX))
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//#error "define exactly one of TEST_REAL or TEST_COMPLEX"
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#endif

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

#if !(defined(TEST_SOLVER_1STAGE) ^ defined(TEST_SOLVER_2STAGE))
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//#error "define exactly one of TEST_SOLVER_1STAGE or TEST_SOLVER_2STAGE"
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#endif

#ifdef TEST_SINGLE
#  define EV_TYPE float
#  ifdef TEST_REAL
#    define MATRIX_TYPE float
#  else
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#    define MATRIX_TYPE complex
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#  endif
#else
#  define EV_TYPE double
#  ifdef TEST_REAL
#    define MATRIX_TYPE double
#  else
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#    define MATRIX_TYPE complex double
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#  endif
#endif

#define assert_elpa_ok(x) assert(x == ELPA_OK)


int main(int argc, char** argv) {
   /* matrix dimensions */
   int na, nev, nblk;

   /* mpi */
   int myid, nprocs;
   int na_cols, na_rows;
   int np_cols, np_rows;
   int my_prow, my_pcol;
   int mpi_comm;
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   int provided_mpi_thread_level;
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   /* blacs */
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   int my_blacs_ctxt, sc_desc[9], info;
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   /* The Matrix */
   MATRIX_TYPE *a, *as, *z;
   EV_TYPE *ev;

   int error, status;

   elpa_t handle;

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   int value;
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#ifdef WITH_MPI
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#ifndef WITH_OPENMP
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   MPI_Init(&argc, &argv);
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#else
   MPI_Init_thread(&argc, &argv, MPI_THREAD_MULTIPLE, &provided_mpi_thread_level);

   if (provided_mpi_thread_level != MPI_THREAD_MULTIPLE) {
     fprintf(stderr, "MPI ERROR: MPI_THREAD_MULTIPLE is not provided on this system\n");
     MPI_Finalize();
     exit(77);
   }
#endif

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   MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
   MPI_Comm_rank(MPI_COMM_WORLD, &myid);
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#else
   nprocs = 1;
   myid = 0;
#endif

   na = 1000;
   nev = 500;
   nblk = 16;

   for (np_cols = (int) sqrt((double) nprocs); np_cols > 1; np_cols--) {
     if (nprocs % np_cols == 0) {
       break;
     }
   }

   np_rows = nprocs/np_cols;

   /* set up blacs */
   /* convert communicators before */
#ifdef WITH_MPI
   mpi_comm = MPI_Comm_c2f(MPI_COMM_WORLD);
#else
   mpi_comm = 0;
#endif
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   set_up_blacsgrid_f(mpi_comm, np_rows, np_cols, 'C', &my_blacs_ctxt, &my_prow, &my_pcol);
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   set_up_blacs_descriptor_f(na, nblk, my_prow, my_pcol, np_rows, np_cols, &na_rows, &na_cols, sc_desc, my_blacs_ctxt, &info);

   /* allocate the matrices needed for elpa */
   a  = calloc(na_rows*na_cols, sizeof(MATRIX_TYPE));
   z  = calloc(na_rows*na_cols, sizeof(MATRIX_TYPE));
   as = calloc(na_rows*na_cols, sizeof(MATRIX_TYPE));
   ev = calloc(na, sizeof(EV_TYPE));

#ifdef TEST_REAL
#ifdef TEST_DOUBLE
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   prepare_matrix_random_real_double_f(na, myid, na_rows, na_cols, sc_desc, a, z, as);
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#else
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   prepare_matrix_random_real_single_f(na, myid, na_rows, na_cols, sc_desc, a, z, as);
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#endif
#else
#ifdef TEST_DOUBLE
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   prepare_matrix_random_complex_double_f(na, myid, na_rows, na_cols, sc_desc, a, z, as);
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#else
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   prepare_matrix_random_complex_single_f(na, myid, na_rows, na_cols, sc_desc, a, z, as);
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#endif
#endif

   if (elpa_init(CURRENT_API_VERSION) != ELPA_OK) {
     fprintf(stderr, "Error: ELPA API version not supported");
     exit(1);
   }

   handle = elpa_allocate(&error);
   assert_elpa_ok(error);

   /* Set parameters */
   elpa_set(handle, "na", na, &error);
   assert_elpa_ok(error);

   elpa_set(handle, "nev", nev, &error);
   assert_elpa_ok(error);

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   if (myid == 0) {
     printf("Setting the matrix parameters na=%d, nev=%d \n",na,nev);
   }
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   elpa_set(handle, "local_nrows", na_rows, &error);
   assert_elpa_ok(error);

   elpa_set(handle, "local_ncols", na_cols, &error);
   assert_elpa_ok(error);

   elpa_set(handle, "nblk", nblk, &error);
   assert_elpa_ok(error);

#ifdef WITH_MPI
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   elpa_set(handle, "mpi_comm_parent", MPI_Comm_c2f(MPI_COMM_WORLD), &error);
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   assert_elpa_ok(error);

   elpa_set(handle, "process_row", my_prow, &error);
   assert_elpa_ok(error);

   elpa_set(handle, "process_col", my_pcol, &error);
   assert_elpa_ok(error);
#endif

   /* Setup */
   assert_elpa_ok(elpa_setup(handle));

   /* Set tunables */
#ifdef TEST_SOLVER_1STAGE
   elpa_set(handle, "solver", ELPA_SOLVER_1STAGE, &error);
#else
   elpa_set(handle, "solver", ELPA_SOLVER_2STAGE, &error);
#endif
   assert_elpa_ok(error);

   elpa_set(handle, "gpu", TEST_GPU, &error);
   assert_elpa_ok(error);

#if defined(TEST_SOLVE_2STAGE) && defined(TEST_KERNEL)
# ifdef TEST_COMPLEX
   elpa_set(handle, "complex_kernel", TEST_KERNEL, &error);
# else
   elpa_set(handle, "real_kernel", TEST_KERNEL, &error);
# endif
   assert_elpa_ok(error);
#endif

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   elpa_get(handle, "solver", &value, &error);
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   if (myid == 0) {
     printf("Solver is set to %d \n", value);
   }
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   /* Solve EV problem */
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   elpa_eigenvectors(handle, a, ev, z, &error);
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   assert_elpa_ok(error);

   elpa_deallocate(handle);
   elpa_uninit();


   /* check the results */
#ifdef TEST_REAL
#ifdef TEST_DOUBLE
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   status = check_correctness_evp_numeric_residuals_real_double_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
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#else
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   status = check_correctness_evp_numeric_residuals_real_single_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
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#endif
#else
#ifdef TEST_DOUBLE
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   status = check_correctness_evp_numeric_residuals_complex_double_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
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#else
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   status = check_correctness_evp_numeric_residuals_complex_single_f(na, nev, na_rows, na_cols, as, z, ev, sc_desc, myid);
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#endif
#endif

   if (status !=0){
     printf("The computed EVs are not correct !\n");
   }
   if (status ==0){
     printf("All ok!\n");
   }

   free(a);
   free(z);
   free(as);
   free(ev);

#ifdef WITH_MPI
   MPI_Finalize();
#endif

   return !!status;
}