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this commit does not work, the generalized EVP problems fail from 2
reasons:
- Cannons algorithm does not work for the processor grid shape we use at
  the moment in tests (It only works if num. of process columns is a
  multiple of num. of process rows, which is not true in ELPA for 2 mpi
  tasks)
- Cannons algorithm does not work as integrated to ELPA for larger
  matrices (not clear why at the moment)

There are 2 new tests, which should work
- test_cannon.c: it tests the new algorithm without going through
  Fortran, as it has been delivered
- test_c_bindings: it tests transfering a 2D fortran matrix to C and
  back, as it is done with the cannons algorithm in the normal ELPA
  tests

so that it works if one of bandred / band_to_full steps are done on GPU
and the other one on CPU

Lead to the first configuration be tested twice

Lorenz Huedepohl authored May 24, 2018 and Pavel Kus committed May 24, 2018

Lead to the first configuration be tested twice

time_spent is not initialized. Should be dealt with in a better way

and passing NULL from the api

on selected mpi ranks using suppress_warnings option

kernel selection. This logic will be further complicated by allowing
individual routines to be run on GPU

Previously, matrix a has been kept on the device at the end of bandred
and then copied to host later in redist_band (called from tridiag_band).
However, it seems to be more convenient to do it at the end of bandred
(since it has to be done anyway). Band to tridi is thus now not using a
on the device at all.  However, we keep it in the interface, sice it
might be usefull in the future.

elpa2_trans_ev_band_to_full_template