elpa_impl.F90 59.8 KB
Newer Older
1
2
3
!
!    Copyright 2017, L. Hüdepohl and A. Marek, MPCDF
!
Andreas Marek's avatar
Andreas Marek committed
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
!    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
!
!    This particular source code file contains additions, changes and
!    enhancements authored by Intel Corporation which is not part of
!    the ELPA consortium.
!
!    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.
!
48
#include "config-f90.h"
49

50
!> \brief Fortran module which provides the actual implementation of the API. Do not use directly! Use the module "elpa"
51
module elpa_impl
52
53
54
55
56
57
58
59
  use precision
  use elpa2_impl
  use elpa1_impl
  use elpa1_auxiliary_impl
  use elpa_mpi
  use elpa_generated_fortran_interfaces
  use elpa_utilities, only : error_unit

60
  use elpa_abstract_impl
Andreas Marek's avatar
Andreas Marek committed
61
#ifdef ENABLE_AUTOTUNING
62
  use elpa_autotune_impl
Andreas Marek's avatar
Andreas Marek committed
63
#endif
64
  use, intrinsic :: iso_c_binding
Pavel Kus's avatar
Pavel Kus committed
65
  use iso_fortran_env
66
  implicit none
67

68
69
  private
  public :: elpa_impl_allocate
70

71
!> \brief Definition of the extended elpa_impl_t type
72
  type, extends(elpa_abstract_impl_t) :: elpa_impl_t
Andreas Marek's avatar
Andreas Marek committed
73
   private
74
   integer :: communicators_owned
75

76
   !> \brief methods available with the elpa_impl_t type
77
   contains
78
     !> \brief the puplic methods
79
     ! con-/destructor
80
81
     procedure, public :: setup => elpa_setup                   !< a setup method: implemented in elpa_setup
     procedure, public :: destroy => elpa_destroy               !< a destroy method: implemented in elpa_destroy
82

83
     ! KV store
84
85
86
87
     procedure, public :: is_set => elpa_is_set                 !< a method to check whether a key/value pair has been set : implemented
                                                                !< in elpa_is_set
     procedure, public :: can_set => elpa_can_set               !< a method to check whether a key/value pair can be set : implemented
                                                                !< in elpa_can_set
88

89
90
91
92

     ! timer
     procedure, public :: get_time => elpa_get_time
     procedure, public :: print_times => elpa_print_times
93
94
     procedure, public :: timer_start => elpa_timer_start
     procedure, public :: timer_stop => elpa_timer_stop
95
96


97
98
99
100
101
102
103
104
105
106
107
108
109
110
     !> \brief the implemenation methods

     procedure, public :: elpa_eigenvectors_d                  !< public methods to implement the solve step for real/complex
                                                               !< double/single matrices
     procedure, public :: elpa_eigenvectors_f
     procedure, public :: elpa_eigenvectors_dc
     procedure, public :: elpa_eigenvectors_fc

     procedure, public :: elpa_eigenvalues_d                   !< public methods to implement the solve step for real/complex
                                                               !< double/single matrices; only the eigenvalues are computed
     procedure, public :: elpa_eigenvalues_f
     procedure, public :: elpa_eigenvalues_dc
     procedure, public :: elpa_eigenvalues_fc

Pavel Kus's avatar
Pavel Kus committed
111
112
113
114
115
116
     procedure, public :: elpa_generalized_eigenvectors_d      !< public methods to implement the solve step for generalized 
                                                               !< eigenproblem and real/complex double/single matrices
     procedure, public :: elpa_generalized_eigenvectors_f
     procedure, public :: elpa_generalized_eigenvectors_dc
     procedure, public :: elpa_generalized_eigenvectors_fc

117
118
119
120
121
122
     procedure, public :: elpa_generalized_eigenvalues_d      !< public methods to implement the solve step for generalized 
                                                              !< eigenproblem and real/complex double/single matrices
     procedure, public :: elpa_generalized_eigenvalues_f
     procedure, public :: elpa_generalized_eigenvalues_dc
     procedure, public :: elpa_generalized_eigenvalues_fc

123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
     procedure, public :: elpa_hermitian_multiply_d            !< public methods to implement a "hermitian" multiplication of matrices a and b
     procedure, public :: elpa_hermitian_multiply_f            !< for real valued matrices:   a**T * b
     procedure, public :: elpa_hermitian_multiply_dc           !< for complex valued matrices:   a**H * b
     procedure, public :: elpa_hermitian_multiply_fc

     procedure, public :: elpa_cholesky_d                      !< public methods to implement the cholesky factorisation of
                                                               !< real/complex double/single matrices
     procedure, public :: elpa_cholesky_f
     procedure, public :: elpa_cholesky_dc
     procedure, public :: elpa_cholesky_fc

     procedure, public :: elpa_invert_trm_d                    !< public methods to implement the inversion of a triangular
                                                               !< real/complex double/single matrix
     procedure, public :: elpa_invert_trm_f
     procedure, public :: elpa_invert_trm_dc
     procedure, public :: elpa_invert_trm_fc

     procedure, public :: elpa_solve_tridiagonal_d             !< public methods to implement the solve step for a real valued
     procedure, public :: elpa_solve_tridiagonal_f             !< double/single tridiagonal matrix

     procedure, public :: associate_int => elpa_associate_int  !< public method to set some pointers
144

Pavel Kus's avatar
Pavel Kus committed
145
     procedure, private :: elpa_transform_generalized_d
146
     procedure, private :: elpa_transform_back_generalized_d
Pavel Kus's avatar
Pavel Kus committed
147
     procedure, private :: elpa_transform_generalized_dc
148
     procedure, private :: elpa_transform_back_generalized_dc
Pavel Kus's avatar
Pavel Kus committed
149
150
#ifdef WANT_SINGLE_PRECISION_REAL
     procedure, private :: elpa_transform_generalized_f
151
     procedure, private :: elpa_transform_back_generalized_f
Pavel Kus's avatar
Pavel Kus committed
152
153
154
#endif
#ifdef WANT_SINGLE_PRECISION_COMPLEX
     procedure, private :: elpa_transform_generalized_fc
155
     procedure, private :: elpa_transform_back_generalized_fc
Pavel Kus's avatar
Pavel Kus committed
156
#endif
157

158
159
     procedure, public :: print_settings => elpa_print_settings
     procedure, public :: store_settings => elpa_store_settings
Andreas Marek's avatar
Andreas Marek committed
160
     procedure, public :: load_settings => elpa_load_settings
Andreas Marek's avatar
Andreas Marek committed
161
#ifdef ENABLE_AUTOTUNING
162
     procedure, public :: autotune_setup => elpa_autotune_setup
163
164
     procedure, public :: autotune_step => elpa_autotune_step
     procedure, public :: autotune_set_best => elpa_autotune_set_best
165
     procedure, public :: autotune_print_best => elpa_autotune_print_best
Pavel Kus's avatar
Pavel Kus committed
166
     procedure, public :: autotune_print_state => elpa_autotune_print_state
167
     procedure, public :: autotune_save_state => elpa_autotune_save_state
168
     procedure, public :: autotune_load_state => elpa_autotune_load_state
Andreas Marek's avatar
Andreas Marek committed
169
#endif
170
     procedure, private :: construct_scalapack_descriptor => elpa_construct_scalapack_descriptor
171
  end type elpa_impl_t
172
173

  !> \brief the implementation of the generic methods
174
  contains
175
176


177
178
179
180
    !> \brief function to allocate an ELPA object
    !> Parameters
    !> \param   error      integer, optional to get an error code
    !> \result  obj        class(elpa_impl_t) allocated ELPA object
181
182
183
184
185
    function elpa_impl_allocate(error) result(obj)
      type(elpa_impl_t), pointer   :: obj
      integer, optional            :: error

      allocate(obj)
Andreas Marek's avatar
Andreas Marek committed
186

Andreas Marek's avatar
Andreas Marek committed
187
      ! check whether init has ever been called
188
      if ( elpa_initialized() .ne. ELPA_OK) then
189
        write(error_unit, *) "elpa_allocate(): you must call elpa_init() once before creating instances of ELPA"
190
191
        if(present(error)) then
          error = ELPA_ERROR
192
        endif
Andreas Marek's avatar
Andreas Marek committed
193
194
        return
      endif
Andreas Marek's avatar
Andreas Marek committed
195

196
      obj%index = elpa_index_instance_c()
197
198

      ! Associate some important integer pointers for convenience
199
200
201
202
203
204
205
206
      obj%na => obj%associate_int("na")
      obj%nev => obj%associate_int("nev")
      obj%local_nrows => obj%associate_int("local_nrows")
      obj%local_ncols => obj%associate_int("local_ncols")
      obj%nblk => obj%associate_int("nblk")

      if(present(error)) then
        error = ELPA_OK
207
208
      endif
    end function
Andreas Marek's avatar
Andreas Marek committed
209

Andreas Marek's avatar
Andreas Marek committed
210

211
212
213
214
215
    !c> /*! \brief C interface for the implementation of the elpa_allocate method
    !c> *
    !c> *  \param  none
    !c> *  \result elpa_t handle
    !c> */
216
    !c> elpa_t elpa_allocate(int *error);
217
    function elpa_impl_allocate_c(error) result(ptr) bind(C, name="elpa_allocate")
218
219
220
221
222
223
224
225
      integer(kind=c_int) :: error
      type(c_ptr) :: ptr
      type(elpa_impl_t), pointer :: obj

      obj => elpa_impl_allocate(error)
      ptr = c_loc(obj)
    end function

Andreas Marek's avatar
Andreas Marek committed
226

227
228
229
230
231
    !c> /*! \brief C interface for the implementation of the elpa_deallocate method
    !c> *
    !c> *  \param  elpa_t  handle of ELPA object to be deallocated
    !c> *  \result void
    !c> */
232
    !c> void elpa_deallocate(elpa_t handle);
233
    subroutine elpa_impl_deallocate_c(handle) bind(C, name="elpa_deallocate")
234
235
236
237
238
239
240
241
      type(c_ptr), value :: handle
      type(elpa_impl_t), pointer :: self

      call c_f_pointer(handle, self)
      call self%destroy()
      deallocate(self)
    end subroutine

Andreas Marek's avatar
Andreas Marek committed
242

Andreas Marek's avatar
Andreas Marek committed
243
#ifdef ENABLE_AUTOTUNING
244
245
246
247
248
    !c> /*! \brief C interface for the implementation of the elpa_autotune_deallocate method
    !c> *
    !c> *  \param  elpa_autotune_impl_t  handle of ELPA autotune object to be deallocated
    !c> *  \result void
    !c> */
249
250
251
    !c> void elpa_autotune_deallocate(elpa_autotune_t handle);
    subroutine elpa_autotune_impl_deallocate_c( autotune_handle) bind(C, name="elpa_autotune_deallocate")
      type(c_ptr), value                  :: autotune_handle
252

253
254
255
      type(elpa_autotune_impl_t), pointer :: self

      call c_f_pointer(autotune_handle, self)
256
257
258
      call self%destroy()
      deallocate(self)
    end subroutine
Andreas Marek's avatar
Andreas Marek committed
259
#endif
260

Andreas Marek's avatar
Andreas Marek committed
261

262
263
264
265
266
267
    ! we want to ensure, that my_prow(col) and np_rows(cols) values are allways accessible trhough
    ! the elpa object, no matter whether the user provides communicators or communicators are created
    ! by elpa. If the walues are present already, they are checked for consistency with the communicators.
    subroutine set_or_check_missing_comm_params(self)
      implicit none
      class(elpa_impl_t), intent(inout)   :: self
268
269
270
      integer                             :: mpi_comm_parent, mpi_comm_rows, mpi_comm_cols, mpierr, error, &
                                             my_prow, my_pcol, my_id, present_my_prow, present_my_pcol, present_my_id, &
                                             np_rows, np_cols, np_total, present_np_rows, present_np_cols, present_np_total, &
271
                                             is_process_id_zero, gpu
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
      if (.not. (self%is_set("mpi_comm_rows") == 1 .and. self%is_set("mpi_comm_cols") == 1) ) then
        print *,"MPI row and column communicators not set correctly. Aborting..."
        stop
      endif
      call self%get("mpi_comm_rows", mpi_comm_rows, error)
      call self%get("mpi_comm_cols", mpi_comm_cols, error)

      call mpi_comm_size(mpi_comm_rows, np_rows, mpierr)
      if(self%is_set("num_process_rows") == 1) then
        call self%get("num_process_rows", present_np_rows, error)
        if(np_rows .ne. present_np_rows) then
          print *,"MPI row communicator not set correctly. Aborting..."
          stop
        endif
      else
        call self%set("num_process_rows", np_rows, error)
      endif

      call mpi_comm_size(mpi_comm_cols, np_cols, mpierr)
      if(self%is_set("num_process_cols") == 1) then
        call self%get("num_process_cols", present_np_cols, error)
        if(np_cols .ne. present_np_cols) then
          print *,"MPI column communicator not set correctly. Aborting..."
          stop
        endif
      else
        call self%set("num_process_cols", np_cols, error)
      endif

      call mpi_comm_rank(mpi_comm_rows, my_prow, mpierr)
      if(self%is_set("process_row") == 1) then
        call self%get("process_row", present_my_prow, error)
        if(my_prow .ne. present_my_prow) then
          print *,"MPI row communicator not set correctly. Aborting..."
          stop
        endif
      else
        call self%set("process_row", my_prow, error)
      endif

      call mpi_comm_rank(mpi_comm_cols, my_pcol, mpierr)
      if(self%is_set("process_col") == 1) then
        call self%get("process_col", present_my_pcol, error)
        if(my_pcol .ne. present_my_pcol) then
          print *,"MPI column communicator not set correctly. Aborting..."
          stop
        endif
      else
        call self%set("process_col", my_pcol, error)
      endif
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361


      ! sadly, at the moment, the parent mpi communicator is not required to be set, e.g. in legacy tests
      ! we thus cannot obtain process_id
      ! we can, however, determine the number of prcesses and determine, whether the given process has id 0, 
      ! assuming, that that is the wan with row and column ids == 0
      is_process_id_zero = 0
      if (self%is_set("mpi_comm_parent") == 1) then
        call self%get("mpi_comm_parent", mpi_comm_parent, error)

        call mpi_comm_size(mpi_comm_parent, np_total, mpierr)
        if(self%is_set("num_processes") == 1) then
          call self%get("num_processes", present_np_total, error)
          if(np_total .ne. present_np_total) then
            print *,"MPI parent communicator not set correctly. Aborting..."
            stop
          endif
        else
          call self%set("num_processes", np_total, error)
        endif

        if(np_total .ne. np_rows * np_cols) then
          print *,"MPI parent communicator and row/col communicators do not match. Aborting..."
          stop
        endif

        call mpi_comm_rank(mpi_comm_parent, my_id, mpierr)
        if(self%is_set("process_id") == 1) then
          call self%get("process_id", present_my_id, error)
          if(my_id .ne. present_my_id) then
            print *,"MPI parent communicator not set correctly. Aborting..."
            stop
          endif
        else
          call self%set("process_id", my_id, error)
        endif

        if(my_id == 0) &
          is_process_id_zero = 1
      else
362
363
364
365
366
367
368
369
370
371
        ! for the GPU calculation, the parent communicator has to be set
        call self%get("gpu",gpu,error)
        if (error .ne. ELPA_OK) then
          print *,"Problem getting option. Aborting..."
          stop
        endif
        if(gpu == 1) then
          print *,"MPI parent communicator has to be set for GPU calculation. Aborting..."
          stop
        endif
372
373
374
375
376
377
378
379
        ! we can set number of processes and whether process id is zero, but not the process id.
        ! we assume, that my_pcol == 0 && my_prow == 0  <==> my_id == 0
        call self%set("num_process", np_rows * np_cols, error)
        if((my_prow == 0) .and. (my_pcol == 0)) &
          is_process_id_zero = 1
      endif
        call self%set("is_process_id_zero", is_process_id_zero, error)

380
381
    end subroutine

Andreas Marek's avatar
Andreas Marek committed
382

383
384
385
386
    !> \brief function to setup an ELPA object and to store the MPI communicators internally
    !> Parameters
    !> \param   self       class(elpa_impl_t), the allocated ELPA object
    !> \result  error      integer, the error code
387
    function elpa_setup(self) result(error)
388
389
      class(elpa_impl_t), intent(inout)   :: self
      integer                             :: error, timings
390

391
#ifdef WITH_MPI
392
393
394
      integer                             :: mpi_comm_parent, mpi_comm_rows, mpi_comm_cols, &
                                             mpierr, mpierr2, process_row, process_col, mpi_string_length
      character(len=MPI_MAX_ERROR_STRING) :: mpierr_string
395
#endif
396

397
#ifdef HAVE_DETAILED_TIMINGS
Andreas Marek's avatar
Andreas Marek committed
398
      call self%get("timings",timings, error)
399
400
401
402
403
404
      if (timings == 1) then
        call self%timer%enable()
      endif
#endif

      error = ELPA_OK
405

406
407
#ifdef WITH_MPI
      ! Create communicators ourselves
408
409
410
      if (self%is_set("mpi_comm_parent") == 1 .and. &
          self%is_set("process_row") == 1 .and. &
          self%is_set("process_col") == 1) then
411

Andreas Marek's avatar
Andreas Marek committed
412
413
414
        call self%get("mpi_comm_parent", mpi_comm_parent, error)
        call self%get("process_row", process_row, error)
        call self%get("process_col", process_col, error)
415
416
417
418
419
420
421

        ! mpi_comm_rows is used for communicating WITHIN rows, i.e. all processes
        ! having the same column coordinate share one mpi_comm_rows.
        ! So the "color" for splitting is process_col and the "key" is my row coordinate.
        ! Analogous for mpi_comm_cols

        call mpi_comm_split(mpi_comm_parent,process_col,process_row,mpi_comm_rows,mpierr)
422

423
424
425
426
427
428
429
430
431
432
433
434
        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 row communicator: ", trim(mpierr_string)
          return
        endif

        call mpi_comm_split(mpi_comm_parent,process_row,process_col,mpi_comm_cols, mpierr)
        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)
          return
        endif
435

Andreas Marek's avatar
Andreas Marek committed
436
437
438
439
440
441
442
443
444
445
        call self%set("mpi_comm_rows", mpi_comm_rows,error)
        if (error .ne. ELPA_OK) then
          print *,"Problem setting option. Aborting..."
          stop
        endif
        call self%set("mpi_comm_cols", mpi_comm_cols,error)
        if (error .ne. ELPA_OK) then
          print *,"Problem setting option. Aborting..."
          stop
        endif
446

447
448
        call set_or_check_missing_comm_params(self)

449
450
451
        ! remember that we created those communicators and we need to free them later
        self%communicators_owned = 1

452
        error = ELPA_OK
453
        return
454
      endif
455

456
      ! Externally supplied communicators
457
      if (self%is_set("mpi_comm_rows") == 1 .and. self%is_set("mpi_comm_cols") == 1) then
458
459
460
461
462
463
464
465
466
467
468
469
        call self%get("mpi_comm_rows", mpi_comm_rows,error)
        if (error .ne. ELPA_OK) then
          print *,"Problem getting option. Aborting..."
          stop
        endif
        call self%get("mpi_comm_cols", mpi_comm_cols,error)
        if (error .ne. ELPA_OK) then
          print *,"Problem getting option. Aborting..."
          stop
        endif
        !write(error_unit, '(A,2I15)') "comms provided", mpi_comm_rows, mpi_comm_cols

470
        call set_or_check_missing_comm_params(self)
471
        self%communicators_owned = 0
472
        error = ELPA_OK
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488


        call self%get("mpi_comm_rows", mpi_comm_rows,error)
        if (error .ne. ELPA_OK) then
          print *,"Problem getting option. Aborting..."
          stop
        endif
        call self%get("mpi_comm_cols", mpi_comm_cols,error)
        if (error .ne. ELPA_OK) then
          print *,"Problem getting option. Aborting..."
          stop
        endif
        call self%get("process_row", process_row, error)
        call self%get("process_col", process_col, error)
        !write(error_unit, '(A,2I15,2I4)') "comms provided II ", mpi_comm_rows, mpi_comm_cols, process_row, process_col

489
        return
490
      endif
491

492
493
      ! Otherwise parameters are missing
      error = ELPA_ERROR
494
495
496
497
498
499
500
501
#else
        call self%set("process_row", 0, error)
        call self%set("process_col", 0, error)
        call self%set("process_id", 0, error)
        call self%set("is_process_id_zero", 1, error)
        call self%set("num_process_rows", 1, error)
        call self%set("num_process_cols", 1, error)
        call self%set("num_processes", 1, error)
502
#endif
503

504
    end function
505

Andreas Marek's avatar
Andreas Marek committed
506

507
508
509
510
511
512
    !c> /*! \brief C interface for the implementation of the elpa_setup method
    !c> *
    !c> *  \param  elpa_t  handle of the ELPA object which describes the problem to
    !c> *                  be set up
    !c> *  \result int     error code, which can be queried with elpa_strerr
    !c> */
513
    !c> int elpa_setup(elpa_t handle);
514
    function elpa_setup_c(handle) result(error) bind(C, name="elpa_setup")
515
516
517
518
519
520
521
522
      type(c_ptr), intent(in), value :: handle
      type(elpa_impl_t), pointer :: self
      integer(kind=c_int) :: error

      call c_f_pointer(handle, self)
      error = self%setup()
    end function

523
    function elpa_construct_scalapack_descriptor(self, sc_desc, rectangular_for_ev) result(error)
524
      class(elpa_impl_t), intent(inout)   :: self
525
      logical, intent(in)                 :: rectangular_for_ev
526
527
528
529
530
531
532
533
534
535
536
537
538
      integer                             :: error, blacs_ctx
      integer, intent(out)                :: sc_desc(SC_DESC_LEN)

#ifdef WITH_MPI
      if (self%is_set("blacs_context") == 0) then
        print *,"BLACS context has not been set beforehand. Aborting..."
        stop
      endif
      call self%get("blacs_context", blacs_ctx, error)

      sc_desc(1) = 1
      sc_desc(2) = blacs_ctx
      sc_desc(3) = self%na
539
540
541
542
543
      if(rectangular_for_ev) then
        sc_desc(4) = self%nev
      else
        sc_desc(4) = self%na
      endif
544
545
546
547
548
549
550
551
552
553
      sc_desc(5) = self%nblk
      sc_desc(6) = self%nblk
      sc_desc(7) = 0
      sc_desc(8) = 0
      sc_desc(9) = self%local_nrows
#else
      sc_desc = 0
#endif
      error = ELPA_OK
    end function
554

Andreas Marek's avatar
Andreas Marek committed
555

556
557
558
559
560
561
562
563
564
    !c> /*! \brief C interface for the implementation of the elpa_set_integer method
    !c> *  This method is available to the user as C generic elpa_set method
    !c> *
    !c> *  \param  handle  handle of the ELPA object for which a key/value pair should be set
    !c> *  \param  name    the name of the key
    !c> *  \param  value   the value to be set for the key
    !c> *  \param  error   on return the error code, which can be queried with elpa_strerr()
    !c> *  \result void
    !c> */
565
    !c> void elpa_set_integer(elpa_t handle, const char *name, int value, int *error);
566
    subroutine elpa_set_integer_c(handle, name_p, value, error) bind(C, name="elpa_set_integer")
Andreas Marek's avatar
Andreas Marek committed
567
568
569
      type(c_ptr), intent(in), value                :: handle
      type(elpa_impl_t), pointer                    :: self
      type(c_ptr), intent(in), value                :: name_p
570
      character(len=elpa_strlen_c(name_p)), pointer :: name
Andreas Marek's avatar
Andreas Marek committed
571
572
      integer(kind=c_int), intent(in), value        :: value
      integer(kind=c_int) , intent(in)              :: error
573
574
575
576
577
578
579

      call c_f_pointer(handle, self)
      call c_f_pointer(name_p, name)
      call elpa_set_integer(self, name, value, error)
    end subroutine


580
581
582
583
584
585
586
587
588
    !c> /*! \brief C interface for the implementation of the elpa_get_integer method
    !c> *  This method is available to the user as C generic elpa_get method
    !c> *
    !c> *  \param  handle  handle of the ELPA object for which a key/value pair should be queried
    !c> *  \param  name    the name of the key
    !c> *  \param  value   the value to be obtain for the key
    !c> *  \param  error   on return the error code, which can be queried with elpa_strerr()
    !c> *  \result void
    !c> */
589
590
    !c> void elpa_get_integer(elpa_t handle, const char *name, int *value, int *error);
    subroutine elpa_get_integer_c(handle, name_p, value, error) bind(C, name="elpa_get_integer")
Andreas Marek's avatar
Andreas Marek committed
591
592
593
      type(c_ptr), intent(in), value                :: handle
      type(elpa_impl_t), pointer                    :: self
      type(c_ptr), intent(in), value                :: name_p
Andreas Marek's avatar
Andreas Marek committed
594
      character(len=elpa_strlen_c(name_p)), pointer :: name
Andreas Marek's avatar
Andreas Marek committed
595
596
      integer(kind=c_int)                           :: value
      integer(kind=c_int), intent(inout)            :: error
597
 
Andreas Marek's avatar
Andreas Marek committed
598
599
      call c_f_pointer(handle, self)
      call c_f_pointer(name_p, name)
600
601
      call elpa_get_integer(self, name, value, error)
    end subroutine
Andreas Marek's avatar
Andreas Marek committed
602
603


604
605
606
607
608
    !> \brief function to check whether a key/value pair is set
    !> Parameters
    !> \param   self       class(elpa_impl_t) the allocated ELPA object
    !> \param   name       string, the key
    !> \result  state      integer, the state of the key/value pair
609
610
    function elpa_is_set(self, name) result(state)
      class(elpa_impl_t)       :: self
611
      character(*), intent(in) :: name
612
      integer                  :: state
613

614
      state = elpa_index_value_is_set_c(self%index, name // c_null_char)
615
616
    end function

617
618
619
620
621
622
    !> \brief function to check whether a key/value pair can be set
    !> Parameters
    !> \param   self       class(elpa_impl_t) the allocated ELPA object
    !> \param   name       string, the key
    !> \param   value      integer, value
    !> \result  error      integer, error code
623
624
625
626
627
628
629
630
631
632
    function elpa_can_set(self, name, value) result(error)
      class(elpa_impl_t)       :: self
      character(*), intent(in) :: name
      integer(kind=c_int), intent(in) :: value
      integer                  :: error

      error = elpa_index_int_is_valid_c(self%index, name // c_null_char, value)
    end function


633
634
635
636
637
638
    !> \brief function to convert a value to an human readable string
    !> Parameters
    !> \param   self        class(elpa_impl_t) the allocated ELPA object
    !> \param   option_name string: the name of the options, whose value should be converted
    !> \param   error       integer: errpr code
    !> \result  string      string: the humanreadable string   
639
    function elpa_value_to_string(self, option_name, error) result(string)
640
641
      class(elpa_impl_t), intent(in) :: self
      character(kind=c_char, len=*), intent(in) :: option_name
642
643
644
645
      type(c_ptr) :: ptr
      integer, intent(out), optional :: error
      integer :: val, actual_error
      character(kind=c_char, len=elpa_index_int_value_to_strlen_c(self%index, option_name // C_NULL_CHAR)), pointer :: string
646

647
648
      nullify(string)

649
      call self%get(option_name, val, actual_error)
650
651
652
653
654
      if (actual_error /= ELPA_OK) then
        if (present(error)) then
          error = actual_error
        endif
        return
655
656
      endif

657
658
659
660
      actual_error = elpa_int_value_to_string_c(option_name // C_NULL_CHAR, val, ptr)
      if (c_associated(ptr)) then
        call c_f_pointer(ptr, string)
      endif
661

662
663
664
665
      if (present(error)) then
        error = actual_error
      endif
    end function
666

Andreas Marek's avatar
Andreas Marek committed
667

668
669
670
671
672
673
674
675
676
    !c> /*! \brief C interface for the implementation of the elpa_set_double method
    !c> *  This method is available to the user as C generic elpa_set method
    !c> *
    !c> *  \param  handle  handle of the ELPA object for which a key/value pair should be set
    !c> *  \param  name    the name of the key
    !c> *  \param  value   the value to be set for the key
    !c> *  \param  error   on return the error code, which can be queried with elpa_strerr()
    !c> *  \result void
    !c> */
677
    !c> void elpa_set_double(elpa_t handle, const char *name, double value, int *error);
678
    subroutine elpa_set_double_c(handle, name_p, value, error) bind(C, name="elpa_set_double")
Andreas Marek's avatar
Andreas Marek committed
679
680
681
      type(c_ptr), intent(in), value                :: handle
      type(elpa_impl_t), pointer                    :: self
      type(c_ptr), intent(in), value                :: name_p
682
      character(len=elpa_strlen_c(name_p)), pointer :: name
Andreas Marek's avatar
Andreas Marek committed
683
684
      real(kind=c_double), intent(in), value        :: value
      integer(kind=c_int), intent(in)               :: error
685

686
687
688
689
690
      call c_f_pointer(handle, self)
      call c_f_pointer(name_p, name)
      call elpa_set_double(self, name, value, error)
    end subroutine

691

692
    !c> /*! \brief C interface for the implementation of the elpa_get_double method
693
694
695
696
697
698
699
700
    !c> *  This method is available to the user as C generic elpa_get method
    !c> *
    !c> *  \param  handle  handle of the ELPA object for which a key/value pair should be queried
    !c> *  \param  name    the name of the key
    !c> *  \param  value   the value to be obtain for the key
    !c> *  \param  error   on return the error code, which can be queried with elpa_strerr()
    !c> *  \result void
    !c> */
701
702
    !c> void elpa_get_double(elpa_t handle, const char *name, double *value, int *error);
    subroutine elpa_get_double_c(handle, name_p, value, error) bind(C, name="elpa_get_double")
Andreas Marek's avatar
Andreas Marek committed
703
704
705
      type(c_ptr), intent(in), value                :: handle
      type(elpa_impl_t), pointer                    :: self
      type(c_ptr), intent(in), value                :: name_p
Andreas Marek's avatar
Andreas Marek committed
706
      character(len=elpa_strlen_c(name_p)), pointer :: name
Andreas Marek's avatar
Andreas Marek committed
707
708
      real(kind=c_double)                           :: value
      integer(kind=c_int), intent(inout)            :: error
709

Andreas Marek's avatar
Andreas Marek committed
710
711
      call c_f_pointer(handle, self)
      call c_f_pointer(name_p, name)
712
713
      call elpa_get_double(self, name, value, error)
    end subroutine
714
 
Andreas Marek's avatar
Andreas Marek committed
715

716
717
718
719
720
    !> \brief function to associate a pointer with an integer value
    !> Parameters
    !> \param   self        class(elpa_impl_t) the allocated ELPA object
    !> \param   name        string: the name of the entry
    !> \result  value       integer, pointer: the value for the entry
721
    function elpa_associate_int(self, name) result(value)
722
      class(elpa_impl_t)             :: self
723
724
      character(*), intent(in)       :: name
      integer(kind=c_int), pointer   :: value
Andreas Marek's avatar
Andreas Marek committed
725

726
727
      type(c_ptr)                    :: value_p

728
      value_p = elpa_index_get_int_loc_c(self%index, name // c_null_char)
729
730
731
      if (.not. c_associated(value_p)) then
        write(error_unit, '(a,a,a)') "ELPA: Warning, received NULL pointer for entry '", name, "'"
      endif
732
733
      call c_f_pointer(value_p, value)
    end function
Andreas Marek's avatar
Andreas Marek committed
734

735

736
737
738
739
740
741
742
    !> \brief function to querry the timing information at a certain level
    !> Parameters
    !> \param   self            class(elpa_impl_t) the allocated ELPA object
    !> \param   name1 .. name6  string: the string identifier for the timer region.
    !>                                  at the moment 6 nested levels can be queried
    !> \result  s               double: the timer metric for the region. Might be seconds,
    !>                                  or any other supported metric
743
744
745
746
747
748
    function elpa_get_time(self, name1, name2, name3, name4, name5, name6) result(s)
      class(elpa_impl_t), intent(in) :: self
      ! this is clunky, but what can you do..
      character(len=*), intent(in), optional :: name1, name2, name3, name4, name5, name6
      real(kind=c_double) :: s

749
#ifdef HAVE_DETAILED_TIMINGS
750
      s = self%timer%get(name1, name2, name3, name4, name5, name6)
751
752
753
#else
      s = -1.0
#endif
754
755
756
    end function


757
758
759
760
761
    !> \brief function to print the timing tree below at a certain level
    !> Parameters
    !> \param   self            class(elpa_impl_t) the allocated ELPA object
    !> \param   name1 .. name6  string: the string identifier for the timer region.
    !>                                  at the moment 4 nested levels can be specified
762
    subroutine elpa_print_times(self, name1, name2, name3, name4)
763
      class(elpa_impl_t), intent(in) :: self
764
      character(len=*), intent(in), optional :: name1, name2, name3, name4
765
#ifdef HAVE_DETAILED_TIMINGS
766
      call self%timer%print(name1, name2, name3, name4)
767
#endif
768
769
    end subroutine

770

771
772
773
774
    !> \brief function to start the timing of a code region
    !> Parameters
    !> \param   self            class(elpa_impl_t) the allocated ELPA object
    !> \param   name            string: a chosen identifier name for the code region
775
776
777
778
779
780
781
782
783
    subroutine elpa_timer_start(self, name)
      class(elpa_impl_t), intent(inout) :: self
      character(len=*), intent(in) :: name
#ifdef HAVE_DETAILED_TIMINGS
      call self%timer%start(name)
#endif
    end subroutine


784
785
786
787
    !> \brief function to stop the timing of a code region
    !> Parameters
    !> \param   self            class(elpa_impl_t) the allocated ELPA object
    !> \param   name            string: identifier name for the code region to stop
788
789
790
791
792
793
794
795
796
    subroutine elpa_timer_stop(self, name)
      class(elpa_impl_t), intent(inout) :: self
      character(len=*), intent(in) :: name
#ifdef HAVE_DETAILED_TIMINGS
      call self%timer%stop(name)
#endif
    end subroutine


797
798
799
    !> \brief function to destroy an elpa object
    !> Parameters
    !> \param   self            class(elpa_impl_t) the allocated ELPA object
800
    subroutine elpa_destroy(self)
801
#ifdef WITH_MPI
Pavel Kus's avatar
Pavel Kus committed
802
803
      integer :: mpi_comm_rows, mpi_comm_cols, mpierr, mpierr2, error, mpi_string_length
      character(len=MPI_MAX_ERROR_STRING) :: mpierr_string
804
#endif
805
      class(elpa_impl_t) :: self
806
807
808

#ifdef WITH_MPI
      if (self%communicators_owned == 1) then
Andreas Marek's avatar
Andreas Marek committed
809
810
811
812
813
814
815
816
817
818
        call self%get("mpi_comm_rows", mpi_comm_rows,error)
        if (error .ne. ELPA_OK) then
           print *,"Problem getting option. Aborting..."
           stop
        endif
        call self%get("mpi_comm_cols", mpi_comm_cols,error)
        if (error .ne. ELPA_OK) then
           print *,"Problem getting option. Aborting..."
           stop
        endif
819

820
        write(error_unit, '(A,2I13)') "FREE comms", mpi_comm_rows, mpi_comm_cols
821
        call mpi_comm_free(mpi_comm_rows, mpierr)
Pavel Kus's avatar
Pavel Kus committed
822
823
824
825
826
        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_free for row communicator: ", trim(mpierr_string)
          return
        endif
827
        call self%set("mpi_comm_cols", -12345,error)
828
        call mpi_comm_free(mpi_comm_cols, mpierr)
Pavel Kus's avatar
Pavel Kus committed
829
830
831
832
833
        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_free for col communicator: ", trim(mpierr_string)
          return
        endif
834
        call self%set("mpi_comm_rows", -12345,error)
835
836
837
      endif
#endif

838
      call timer_free(self%timer)
839
      call timer_free(self%autotune_timer)
840
841
      call elpa_index_free_c(self%index)

842
    end subroutine
Andreas Marek's avatar
Andreas Marek committed
843

Pavel Kus's avatar
Pavel Kus committed
844
845
#define REALCASE 1
#define DOUBLE_PRECISION 1
Andreas Marek's avatar
Andreas Marek committed
846
#define INCLUDE_ROUTINES 1
Pavel Kus's avatar
Pavel Kus committed
847
#include "general/precision_macros.h"
Andreas Marek's avatar
Andreas Marek committed
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
#include "elpa_impl_math_template.F90"
#undef REALCASE
#undef DOUBLE_PRECISION
#undef INCLUDE_ROUTINES

#ifdef WANT_SINGLE_PRECISION_REAL
#define INCLUDE_ROUTINES 1
#endif
#define REALCASE 1
#define SINGLE_PRECISION 1
#include "general/precision_macros.h"
#include "elpa_impl_math_template.F90"
#undef REALCASE
#undef SINGLE_PRECISION
#undef INCLUDE_ROUTINES

#define COMPLEXCASE 1
#define DOUBLE_PRECISION 1
#define INCLUDE_ROUTINES 1
#include "general/precision_macros.h"
#include "elpa_impl_math_template.F90"
#undef DOUBLE_PRECISION
#undef COMPLEXCASE
#undef INCLUDE_ROUTINES

#ifdef WANT_SINGLE_PRECISION_COMPLEX
#define INCLUDE_ROUTINES 1
#endif
#define COMPLEXCASE 1
#define SINGLE_PRECISION
#include "general/precision_macros.h"
#include "elpa_impl_math_template.F90"
#undef COMPLEXCASE
#undef SINGLE_PRECISION
#undef INCLUDE_ROUTINES

#define REALCASE 1
#define DOUBLE_PRECISION 1
#include "general/precision_macros.h"
#include "elpa_impl_generalized_transform_template.F90"
Pavel Kus's avatar
Pavel Kus committed
888
889
890
891
892
893
894
#undef REALCASE
#undef DOUBLE_PRECISION

#ifdef WANT_SINGLE_PRECISION_REAL
#define REALCASE 1
#define SINGLE_PRECISION 1
#include "general/precision_macros.h"
Andreas Marek's avatar
Andreas Marek committed
895
#include "elpa_impl_generalized_transform_template.F90"
Pavel Kus's avatar
Pavel Kus committed
896
897
#undef REALCASE
#undef SINGLE_PRECISION
Andreas Marek's avatar
Andreas Marek committed
898
#endif
Pavel Kus's avatar
Pavel Kus committed
899
900

#define COMPLEXCASE 1
Andreas Marek's avatar
Andreas Marek committed
901

Pavel Kus's avatar
Pavel Kus committed
902
903
#define DOUBLE_PRECISION 1
#include "general/precision_macros.h"
Andreas Marek's avatar
Andreas Marek committed
904
#include "elpa_impl_generalized_transform_template.F90"
Pavel Kus's avatar
Pavel Kus committed
905
906
907
908
909
910
911
#undef DOUBLE_PRECISION
#undef COMPLEXCASE

#ifdef WANT_SINGLE_PRECISION_COMPLEX
#define COMPLEXCASE 1
#define SINGLE_PRECISION
#include "general/precision_macros.h"
Andreas Marek's avatar
Andreas Marek committed
912
#include "elpa_impl_generalized_transform_template.F90"
Pavel Kus's avatar
Pavel Kus committed
913
914
#undef COMPLEXCASE
#undef SINGLE_PRECISION
Andreas Marek's avatar
Andreas Marek committed
915
916
#endif

Andreas Marek's avatar
Andreas Marek committed
917

918
919
920
921
922
923
!    function use_cannons_algorithm(self) result(use_cannon, do_print)
!      class(elpa_impl_t), intent(inout), target :: self
!      logical                                   :: use_cannon
!      logical, intent(in)                       :: do_print
!    end function
!
Andreas Marek's avatar
Andreas Marek committed
924
#ifdef ENABLE_AUTOTUNING
925
926
    !> \brief function to setup the ELPA autotuning and create the autotune object
    !> Parameters
927
    !> \param   self            the allocated ELPA object
928
929
    !> \param   level           integer: the "thoroughness" of the planed autotuning
    !> \param   domain          integer: the domain (real/complex) which should be tuned
930
    !> \result  tune_state      the created autotuning object
931
    function elpa_autotune_setup(self, level, domain, error) result(tune_state)
932
      class(elpa_impl_t), intent(inout), target :: self
Andreas Marek's avatar
Andreas Marek committed
933
934
935
      integer, intent(in)                       :: level, domain
      type(elpa_autotune_impl_t), pointer       :: ts_impl
      class(elpa_autotune_t), pointer           :: tune_state
936
937
938
939
940
#ifdef USE_FORTRAN2008
      integer(kind=c_int), optional             :: error
#else
      integer(kind=c_int)                       :: error
#endif
941

942
943
944
945
946
947
948
#ifdef USE_FORTRAN2008
      if (present(error)) then
        error = ELPA_OK
      endif
#else
      error = ELPA_OK
#endif
Andreas Marek's avatar
Andreas Marek committed
949
      if (elpa_get_api_version() < EARLIEST_AUTOTUNE_VERSION) then
950
951
952
953
954
955
956
957
958
        write(error_unit, "(a,i0,a)") "ELPA: Error API version: Autotuning does not support ", elpa_get_api_version()
#ifdef USE_FORTRAN2008
        if (present(error)) then
          error = ELPA_ERROR
        endif
#else
        error = ELPA_ERROR
#endif
        return
Andreas Marek's avatar
Andreas Marek committed
959
960
      endif

961
962
963
964
965
      allocate(ts_impl)
      ts_impl%parent => self
      ts_impl%level = level
      ts_impl%domain = domain

966
      ts_impl%current = -1
967
      ts_impl%min_loc = -1
968
      ts_impl%cardinality = elpa_index_autotune_cardinality_c(self%index, level, domain)
969
970
971
972
973
974
975

      tune_state => ts_impl

      call self%autotune_timer%enable()
    end function


Andreas Marek's avatar
Andreas Marek committed
976

977
978
979
980
981
982
983
    !c> /*! \brief C interface for the implementation of the elpa_autotune_setup method
    !c> *
    !c> *  \param  elpa_t           handle: of the ELPA object which should be tuned
    !c> *  \param  int              level:  "thoroughness" of autotuning
    !c> *  \param  int              domain: real/complex autotuning
    !c> *  \result elpa_autotune_t  handle:  on the autotune object
    !c> */
984
985
    !c> elpa_autotune_t elpa_autotune_setup(elpa_t handle, int level, int domain, int *error);
    function elpa_autotune_setup_c(handle ,level, domain, error) result(ptr) bind(C, name="elpa_autotune_setup")
986
987
988
989
990
991
992
      type(c_ptr), intent(in), value         :: handle
      type(elpa_impl_t), pointer             :: self
      class(elpa_autotune_t), pointer        :: tune_state
      type(elpa_autotune_impl_t), pointer    :: obj        
      integer(kind=c_int), intent(in), value :: level
      integer(kind=c_int), intent(in), value :: domain
      type(c_ptr)                            :: ptr
993
      integer(kind=c_int) , intent(in)       :: error
994
995

      call c_f_pointer(handle, self)
996

997
      tune_state => self%autotune_setup(level, domain, error)
998
      select type(tune_state)
999
        type is (elpa_autotune_impl_t)
1000
1001
1002
          obj => tune_state
        class default
          print *, "This should not happen"
1003
          stop
1004
1005
      end select                
      ptr = c_loc(obj)
1006

1007
    end function
1008
1009


1010
1011
1012
1013
1014
    !> \brief function to do an autotunig step
    !> Parameters
    !> \param   self            class(elpa_impl_t) the allocated ELPA object
    !> \param   tune_state      class(elpa_autotune_t): the autotuning object
    !> \result  unfinished      logical: describes the state of the autotuning (completed/uncompleted)
1015
    function elpa_autotune_step(self, tune_state, error) result(unfinished)
1016
      implicit none
1017
      class(elpa_impl_t), intent(inout)             :: self
1018
      class(elpa_autotune_t), intent(inout), target :: tune_state
1019
      type(elpa_autotune_impl_t), pointer           :: ts_impl
Andreas Marek's avatar
Andreas Marek committed
1020
1021
1022
1023
1024
1025
1026
1027
#ifdef USE_FORTRAN2008
      integer(kind=c_int), optional, intent(out)    :: error
#else
      integer(kind=c_int),  intent(out)             :: error
#endif
      logical                                       :: unfinished
      integer                                       :: i
      real(kind=C_DOUBLE)                           :: time_spent
1028

1029
1030
1031
      if (present(error)) then
        error = ELPA_OK
      endif
1032
      select type(tune_state)
1033
        type is (elpa_autotune_impl_t)
1034
1035
1036
          ts_impl => tune_state
        class default
          print *, "This should not happen"
1037
1038
1039
          if (present(error)) then
            error = ELPA_OK
          endif
1040
1041
1042
1043
      end select

      unfinished = .false.

1044
      if (ts_impl%current >= 0) then
1045
#ifdef HAVE_DETAILED_TIMINGS
1046
        time_spent = self%autotune_timer%get("accumulator")
1047
1048
#else
        print *, "Cannot do autotuning without detailed timings"
1049
1050
1051
1052
1053

        if (present(error)) then
          error = ELPA_OK
          return
        endif
1054
#endif
1055
1056
        if (ts_impl%min_loc == -1 .or. (time_spent < ts_impl%min_val)) then
          ts_impl%min_val = time_spent
1057
          ts_impl%min_loc = ts_impl%current
1058
1059
1060
1061
        end if
        call self%autotune_timer%free()
      endif

1062
1063
1064
      do while (ts_impl%current < ts_impl%cardinality - 1)
        ts_impl%current = ts_impl%current + 1
        if (elpa_index_set_autotune_parameters_c(self%index, ts_impl%level, ts_impl%domain, ts_impl%current) == 1) then
1065
1066
1067
1068
1069
1070
1071
1072
          unfinished = .true.
          return
        end if
      end do

    end function


1073

1074
1075
1076
1077
1078
1079
1080
    !c> /*! \brief C interface for the implementation of the elpa_autotune_step method
    !c> *
    !c> *  \param  elpa_t           handle: of the ELPA object which should be tuned
    !c> *  \param  elpa_autotune_t  autotune_handle: the autotuning object
    !c> *  \param  error            int *error code
    !c> *  \result int              unfinished:  describes whether autotuning finished (0) or not (1)
    !c> */
Andreas Marek's avatar
Andreas Marek committed
1081
1082
1083
    !c> int elpa_autotune_step(elpa_t handle, elpa_autotune_t autotune_handle, int *error);
    function elpa_autotune_step_c(handle, autotune_handle, &
                    error) result(unfinished) bind(C, name="elpa_autotune_step")
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
      type(c_ptr), intent(in), value       :: handle
      type(c_ptr), intent(in), value       :: autotune_handle
      type(elpa_impl_t), pointer           :: self
      type(elpa_autotune_impl_t), pointer  :: tune_state
      logical                              :: unfinished_f
      integer(kind=c_int)                  :: unfinished
      integer(kind=c_int)                  :: error

      call c_f_pointer(handle, self)
      call c_f_pointer(autotune_handle, tune_state)

      unfinished_f = self%autotune_step(tune_state, error)
      if (unfinished_f) then
        unfinished = 1
      else
        unfinished = 0
      endif

    end function
1103

1104
1105
1106
1107
    !> \brief function to set the up-to-know best options of the autotuning
    !> Parameters
    !> \param   self            class(elpa_impl_t) the allocated ELPA object
    !> \param   tune_state      class(elpa_autotune_t): the autotuning object
1108
1109
    !> \param   error code      optional, integer
    subroutine elpa_autotune_set_best(self, tune_state, error)
1110
      implicit none
1111
      class(elpa_impl_t), intent(inout)          :: self
1112
      class(elpa_autotune_t), intent(in), target :: tune_state
1113
      type(elpa_autotune_impl_t), pointer        :: ts_impl
Andreas Marek's avatar
Andreas Marek committed
1114
#ifdef USE_FORTRAN2008
1115
      integer(kind=ik), optional, intent(out)    :: error
Andreas Marek's avatar
Andreas Marek committed
1116
1117
1118
#else
      integer(kind=ik), intent(out)              :: error
#endif
1119
1120
1121
      if (present(error)) then
        error = ELPA_OK
      endif
1122
      select type(tune_state)
1123
        type is (elpa_autotune_impl_t)
1124
1125
1126
          ts_impl => tune_state
        class default
          print *, "This should not happen"
1127
1128
1129
          if (present(error)) then
            error = ELPA_ERROR
          endif