GitLab

A build without autotools is not officially supported anymore.
Thus this --- broken since long time --- Makefile.example is removed

The examples, how to invoke ELPA from a c program have been updated.
There are now examples for ELPA1 and ELPA2 both real and complex case.
The test cases are still with less functionality than their Fortran
counter parts, they are just ment as a "proof-of-concept".

- enabling fusing iterations of stage 5 in ELPA2 for every configuration
- Changed reduction bandwidth in ELPA2 to be at least 64
- partial OpenMP parallelization of the QR factorization in bandred_real
- OpenMP parallelization of SYMM
- OpenMP parallelization of SYR2K in bandred_real
- OpenMP parallelization for elpa1_reduce_add_vectors and elpa1_transpose_vectors
- AVX2 support in backtransformation elpa2_kernels (FMA3 instructions introduced with Haswell microarchitecture)

This commit is not ABI compatible, since it changes the interfaces
of some routines

Also, introduce type checking for transpose and reduce_add routines

C interfaces are now available and definied in the header
elpa.h

In the test programms "MPI_ABORT" has been used incorrectly.

The procedure "get_elpa_row_col_comms" is now a function instead
a subroutine and returns an error code.

This should have been done previously when all the other ELPA
function have been updated to return an error code.

This requires an ABI change in the next ELPA release !

If the QR-decomposition is used wrongly (matrix size is not a
multiple of block size) the the execution will abort, in
order to prevent the wrong results, discussed in a previous commit

Debug messages are now available by setting the environment variable
"ELPA_DEBUG_MESSAGES" to "yes".

For an MPI library that does not support MPI_THREAD_MULTIPLE the tests
now report "SKIP" instead of "FAIL".

The qr decomposition is now available as a runtime choice.
Some testing has still to be done

We have taken the unusual (one-time) step to modify the structure
of the ELPA git repository as follows:

1) The current ELPA version has been designated as a "stable"
   version. It has proven to be rock solid for us so far, and
   deserves this name.

2) We have decided on a stable version naming scheme,
   "ELPA_year.month". The first such version is
   ELPA_2011.12. This version will only ever be updated
   for clear and unambiguous bug fixes.

3) All further development will happen in the directory named
   ELPA_development_version. At this time, ELPA_2011.12 is an
   exact copy of ELPA_development_version.

No substantial changes have been made to either repository as yet.
(But we are happy to say that the present "ELPA" publication, which
we hope ELPA users will cite, now has its final volume and page
numbers.)

We apologize if this change causes any inconvenience for you. Please
try to make sure that any changes you might make really affect the
development version, and not the stable version. We do not plan any
structural changes of a similar scope at any point in the future,
but it had to be done once.

Happy ELPA stable version day!

There are two new programs which read matrices from a file, solve the
real (generalized) eigenvalue problem, print the eigenvalues and check
the result (all using elpa1 only).

The author of these programs (plus documentation and Makefile) is
Rainer Johanni (RJ). The files are checked in by Werner Jürgens.

but will do for now.

     now reflect the current status of ELPA for any future developments.