Recreate test program for test_project

test_project/src/test_real.F90

-../../test/test_real.F90
\ No newline at end of file

test_project/src/test_real.F90

+!    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"
+!>
+!> Fortran test programm to demonstrates the use of
+!> ELPA 1 real case library.
+!> If "HAVE_REDIRECT" was defined at build time
+!> the stdout and stderr output of each MPI task
+!> can be redirected to files if the environment
+!> variable "REDIRECT_ELPA_TEST_OUTPUT" is set
+!> to "true".
+!>
+!> By calling executable [arg1] [arg2] [arg3] [arg4]
+!> one can define the size (arg1), the number of
+!> Eigenvectors to compute (arg2), and the blocking (arg3).
+!> If these values are not set default values (4000, 1500, 16)
+!> are choosen.
+!> If these values are set the 4th argument can be
+!> "output", which specifies that the EV's are written to
+!> an ascii file.
+!>
+program test_real_example
+
+!-------------------------------------------------------------------------------
+! Standard eigenvalue problem - REAL version
+!
+! This program demonstrates the use of the ELPA module
+! together with standard scalapack routines
+!
+! Copyright of the original code rests with the authors inside the ELPA
+! consortium. The copyright of any additional modifications shall rest
+! with their original authors, but shall adhere to the licensing terms
+! distributed along with the original code in the file "COPYING".
+!
+!-------------------------------------------------------------------------------
+   use ELPA1
+   use elpa_utilities, only : error_unit
+   use elpa_mpi
+   use iso_c_binding
+   implicit none
+
+   !-------------------------------------------------------------------------------
+   ! Please set system size parameters below!
+   ! na:   System size
+   ! nev:  Number of eigenvectors to be calculated
+   ! nblk: Blocking factor in block cyclic distribution
+   !-------------------------------------------------------------------------------
+   integer, parameter         :: ik = C_INT32_T
+   integer, parameter         :: rk = C_DOUBLE
+
+   integer(kind=ik)           :: nblk
+   integer(kind=ik)           :: na, nev
+
+   integer(kind=ik)           :: np_rows, np_cols, na_rows, na_cols
+
+   integer(kind=ik)           :: myid, nprocs, my_prow, my_pcol, mpi_comm_rows, mpi_comm_cols
+   integer(kind=ik)           :: i, mpierr, my_blacs_ctxt, sc_desc(9), info, nprow, npcol
+
+   integer, external          :: numroc
+
+   real(kind=rk), allocatable :: a(:,:), z(:,:), ev(:)
+
+   integer(kind=ik)           :: iseed(4096) ! Random seed, size should be sufficient for every generator
+
+   integer(kind=ik)           :: STATUS
+   logical                    :: success
+   character(len=8)           :: task_suffix
+   integer(kind=ik)           :: j
+
+   !-------------------------------------------------------------------------------
+
+
+   success = .true.
+
+   ! default parameters
+   na = 4000
+   nev = 1500
+   nblk = 16
+
+   call mpi_init(mpierr)
+   call mpi_comm_rank(mpi_comm_world,myid,mpierr)
+   call mpi_comm_size(mpi_comm_world,nprocs,mpierr)
+
+   do np_cols = NINT(SQRT(REAL(nprocs))),2,-1
+     if(mod(nprocs,np_cols) == 0 ) exit
+   enddo
+   ! at the end of the above loop, nprocs is always divisible by np_cols
+
+   np_rows = nprocs/np_cols
+
+   if (myid==0) then
+     print *
+     print '(a)','Standard eigenvalue problem - REAL version'
+     print *
+     print '(3(a,i0))','Matrix size=',na,', Number of eigenvectors=',nev,', Block size=',nblk
+     print '(3(a,i0))','Number of processor rows=',np_rows,', cols=',np_cols,', total=',nprocs
+     print *
+   endif
+
+   ! initialise BLACS
+   my_blacs_ctxt = mpi_comm_world
+   call BLACS_Gridinit(my_blacs_ctxt, 'C', np_rows, np_cols)
+   call BLACS_Gridinfo(my_blacs_ctxt, nprow, npcol, my_prow, my_pcol)
+
+   if (myid==0) then
+     print '(a)','| Past BLACS_Gridinfo.'
+   end if
+
+   ! determine the neccessary size of the distributed matrices,
+   ! we use the scalapack tools routine NUMROC
+
+   na_rows = numroc(na, nblk, my_prow, 0, np_rows)
+   na_cols = numroc(na, nblk, my_pcol, 0, np_cols)
+
+   ! set up the scalapack descriptor for the checks below
+   ! For ELPA the following restrictions hold:
+   ! - block sizes in both directions must be identical (args 4 a. 5)
+   ! - first row and column of the distributed matrix must be on
+   !   row/col 0/0 (arg 6 and 7)
+
+   call descinit(sc_desc, na, na, nblk, nblk, 0, 0, my_blacs_ctxt, na_rows, info)
+
+   if (info .ne. 0) then
+     write(error_unit,*) 'Error in BLACS descinit! info=',info
+     write(error_unit,*) 'Most likely this happend since you want to use'
+     write(error_unit,*) 'more MPI tasks than are possible for your'
+     write(error_unit,*) 'problem size (matrix size and blocksize)!'
+     write(error_unit,*) 'The blacsgrid can not be set up properly'
+     write(error_unit,*) 'Try reducing the number of MPI tasks...'
+     call MPI_ABORT(mpi_comm_world, 1, mpierr)
+   endif
+
+   if (myid==0) then
+     print '(a)','| Past scalapack descriptor setup.'
+   end if
+
+   allocate(a (na_rows,na_cols))
+   allocate(z (na_rows,na_cols))
+
+   allocate(ev(na))
+
+   ! we want different random numbers on every process
+   ! (otherwise A might get rank deficient):
+
+   iseed(:) = myid
+   call RANDOM_SEED(put=iseed)
+   call RANDOM_NUMBER(z)
+
+   a(:,:) = z(:,:)
+
+   if (myid == 0) then
+     print '(a)','| Random matrix block has been set up. (only processor 0 confirms this step)'
+   endif
+   call pdtran(na, na, 1.d0, z, 1, 1, sc_desc, 1.d0, a, 1, 1, sc_desc) ! A = A + Z**T
+
+   !-------------------------------------------------------------------------------
+   ! Calculate eigenvalues/eigenvectors
+
+   if (myid==0) then
+     print '(a)','| Entering one-step ELPA solver ... '
+     print *
+   end if
+
+   call mpi_barrier(mpi_comm_world, mpierr) ! for correct timings only
+   success = solve_evp_real_1stage(na, nev, a, na_rows, ev, z, na_rows, nblk, &
+                            na_cols, mpi_comm_rows, mpi_comm_cols)
+
+   if (.not.(success)) then
+      write(error_unit,*) "solve_evp_real_1stage produced an error! Aborting..."
+      call MPI_ABORT(mpi_comm_world, 1, mpierr)
+   endif
+
+   if (myid==0) then
+     print '(a)','| One-step ELPA solver complete.'
+     print *
+   end if
+
+   if (myid == 0) print *,'Time tridiag_real     :',time_evp_fwd
+   if (myid == 0) print *,'Time solve_tridi      :',time_evp_solve
+   if (myid == 0) print *,'Time trans_ev_real    :',time_evp_back
+   if (myid == 0) print *,'Total time (sum above):',time_evp_back+time_evp_solve+time_evp_fwd
+
+   call blacs_gridexit(my_blacs_ctxt)
+   call mpi_finalize(mpierr)
+
+end
+