1. 12 Feb, 2016 1 commit
    • Andreas Marek's avatar
      Single precision support for ELPA2 · 56043bdc
      Andreas Marek authored
      ELPA2 can now be build (as ELPA1) for single precision calculations.
      The ELPA2 kernles which are implemented in assembler, C, or C++ have NOT
      yet been ported.
      
      Thus at the moment only the GENERIC and GENERIC_SIMPLE kernels support
      single precision calculations
      56043bdc
  2. 11 Feb, 2016 1 commit
    • Andreas Marek's avatar
      Enable single-precision calculations for ELPA1 · de6a4fde
      Andreas Marek authored
      With the configure option "--enable-single-precision" ELPA1 is build
      with single-precision (half-words) only.
      
      The best precision in single-precision (float or complex) is
      2^-23 ~ 1.2e-7. The accuracy of the error residual of ELPA1 in
      single-precision mode is of the order 1e-4 to 1e-5. The orthogonality of
      the EV's is fullfilled up to about ~1e-6.
      
      Thus the precision of ELPA1 in single-precision mode is roughly 100 -
      1000 times less than the best achievable precison. This is consistent
      with the double-precision mode, where also a factor of 100 - 1000 less
      precision than the theoretical best one is found.
      
      The float EVs are identical to the double EVs to at least 1e-2, the
      precision of the EVs is thus about 1e-7/1e-2 = 1e5 times lower than the
      best theoretical precision. If the same holds for the double precision
      calculations, this implies that the double precision results can also
      be only trusted on the level 1e-11 (5 orders of magnitude larger
      than the best theoretical precision)
      
      The best speed-up compared to the double precision calculation is
      a factor of two. This is by far not achieved yet, since the singl
      precision version is not at all optimized at the moment
      de6a4fde
  3. 05 Feb, 2016 1 commit
  4. 04 Feb, 2016 2 commits
  5. 03 Feb, 2016 4 commits
  6. 02 Feb, 2016 16 commits
  7. 22 Jan, 2016 1 commit
  8. 19 Jan, 2016 3 commits
  9. 13 Jan, 2016 1 commit
  10. 11 Jan, 2016 1 commit
  11. 08 Jan, 2016 1 commit
  12. 05 Jan, 2016 2 commits
    • Andreas Marek's avatar
      Merge branch 'master' into ELPA_GPU · c03e7828
      Andreas Marek authored
      c03e7828
    • Andreas Marek's avatar
      Updated all variable types · 62a29931
      Andreas Marek authored
      All variables (real, integer, complex) are now declecared with the
      appropiate kind statement. The definition of the kind types is done
      in src/mod_precision.f90
      
      To ensure interoperability with C, the kind types are decleared via
      iso_c_binding to C variables
      62a29931
  13. 04 Jan, 2016 3 commits
  14. 22 Dec, 2015 2 commits
  15. 17 Dec, 2015 1 commit