Line data    Source code

       1             : !    This file is part of ELPA.
       2             : !
       3             : !    The ELPA library was originally created by the ELPA consortium,
       4             : !    consisting of the following organizations:
       5             : !
       6             : !    - Max Planck Computing and Data Facility (MPCDF), formerly known as
       7             : !      Rechenzentrum Garching der Max-Planck-Gesellschaft (RZG),
       8             : !    - Bergische Universität Wuppertal, Lehrstuhl für angewandte
       9             : !      Informatik,
      10             : !    - Technische Universität München, Lehrstuhl für Informatik mit
      11             : !      Schwerpunkt Wissenschaftliches Rechnen ,
      12             : !    - Fritz-Haber-Institut, Berlin, Abt. Theorie,
      13             : !    - Max-Plack-Institut für Mathematik in den Naturwissenschaften,
      14             : !      Leipzig, Abt. Komplexe Strukutren in Biologie und Kognition,
      15             : !      and
      16             : !    - IBM Deutschland GmbH
      17             : !
      18             : !    This particular source code file contains additions, changes and
      19             : !    enhancements authored by Intel Corporation which is not part of
      20             : !    the ELPA consortium.
      21             : !
      22             : !    More information can be found here:
      23             : !    http://elpa.mpcdf.mpg.de/
      24             : !
      25             : !    ELPA is free software: you can redistribute it and/or modify
      26             : !    it under the terms of the version 3 of the license of the
      27             : !    GNU Lesser General Public License as published by the Free
      28             : !    Software Foundation.
      29             : !
      30             : !    ELPA is distributed in the hope that it will be useful,
      31             : !    but WITHOUT ANY WARRANTY; without even the implied warranty of
      32             : !    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      33             : !    GNU Lesser General Public License for more details.
      34             : !
      35             : !    You should have received a copy of the GNU Lesser General Public License
      36             : !    along with ELPA.  If not, see <http://www.gnu.org/licenses/>
      37             : !
      38             : !    ELPA reflects a substantial effort on the part of the original
      39             : !    ELPA consortium, and we ask you to respect the spirit of the
      40             : !    license that we chose: i.e., please contribute any changes you
      41             : !    may have back to the original ELPA library distribution, and keep
      42             : !    any derivatives of ELPA under the same license that we chose for
      43             : !    the original distribution, the GNU Lesser General Public License.
      44             : !
      45             : !
      46             : ! ELPA1 -- Faster replacements for ScaLAPACK symmetric eigenvalue routines
      47             : !
      48             : ! Copyright of the original code rests with the authors inside the ELPA
      49             : ! consortium. The copyright of any additional modifications shall rest
      50             : ! with their original authors, but shall adhere to the licensing terms
      51             : ! distributed along with the original code in the file "COPYING".
      52             : 
      53             : #include "../general/sanity.F90"
      54             : 
      55             :      subroutine herm_matrix_allreduce_&
      56      209664 :      &PRECISION &
      57      209664 :                                     (obj, n, a, lda, ldb, comm)
      58             :      !-------------------------------------------------------------------------------
      59             :      !  herm_matrix_allreduce: Does an mpi_allreduce for a hermitian matrix A.
      60             :      !  On entry, only the upper half of A needs to be set
      61             :      !  On exit, the complete matrix is set
      62             :       use elpa_abstract_impl
      63             :       use precision
      64             :       implicit none
      65             :       class(elpa_abstract_impl_t), intent(inout) :: obj
      66             :       integer(kind=ik)               :: n, lda, ldb, comm
      67             :       complex(kind=COMPLEX_DATATYPE) :: a(lda,ldb)
      68             : 
      69             :       integer(kind=ik)               :: i, nc, mpierr
      70      419328 :       complex(kind=COMPLEX_DATATYPE) :: h1(n*n), h2(n*n)
      71             : 
      72      209664 :        call obj%timer%start("herm_matrix_allreduce" // PRECISION_SUFFIX)
      73             : 
      74      209664 :        nc = 0
      75     6518016 :        do i=1,n
      76     6308352 :          h1(nc+1:nc+i) = a(1:i,i)
      77     6308352 :          nc = nc+i
      78             :        enddo
      79             : #ifdef WITH_MPI
      80      139776 :        call obj%timer%start("mpi_communication")
      81      139776 :        call mpi_allreduce(h1, h2, nc, MPI_COMPLEX_PRECISION, MPI_SUM, comm, mpierr)
      82      139776 :        call obj%timer%stop("mpi_communication")
      83             : 
      84      139776 :        nc = 0
      85     4345344 :        do i=1,n
      86     4205568 :          a(1:i,i) = h2(nc+1:nc+i)
      87     4205568 :          a(i,1:i-1) = conjg(a(1:i-1,i))
      88     4205568 :          nc = nc+i
      89             :        enddo
      90             : 
      91             : 
      92             : #else /* WITH_MPI */
      93             : !       h2(1:nc) = h1(1:nc)
      94             : 
      95       69888 :        nc = 0
      96     2172672 :        do i=1,n
      97     2102784 :          a(1:i,i) = h1(nc+1:nc+i)
      98     2102784 :          a(i,1:i-1) = conjg(a(1:i-1,i))
      99     2102784 :          nc = nc+i
     100             :        enddo
     101             : 
     102             : 
     103             : #endif /* WITH_MPI */
     104             : 
     105             : !       nc = 0
     106             : !       do i=1,n
     107             : !         a(1:i,i) = h2(nc+1:nc+i)
     108             : !         a(i,1:i-1) = conjg(a(1:i-1,i))
     109             : !         nc = nc+i
     110             : !       enddo
     111             : 
     112      209664 :        call obj%timer%stop("herm_matrix_allreduce" // PRECISION_SUFFIX)
     113             : 
     114             :      end subroutine herm_matrix_allreduce_&
     115      209664 :      &PRECISION
     116             : 
     117             :