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The user functions of ELPA are now documented with doxygen tags.
At the moment the interface of ELPA 2015.11.001 is decribed.

The documentation has step by step to be implemented for all functions
and test programms.

As in a previous commit for elpa1.F90, for automatic generation of
documentation elpa2.F90 has been splitted in two files, in order to
have a lean, easy-to-understand user interface:

elpa2.F90
the visible user functions, which provide the library calls.
The usage is the same as before

elpa2_compute.F90
all internal routines, which are used by ELPA2, but which are never
called external of the library by a user. These functions are now
"hidden" in the module elpa2_compute, which is used by ELPA2.

The procedures in elpa2_compute.F90 are identical to the ones in
elpa2.F90 before this split commit. The only -- but quite a lot of them
-- changes are intendation changes.

For automatic generation of documentation, the file elpa1.F90
has been splitted into two files, in order to have a lean,
easy-to-understand user interface:

elpa1.F90
the visible user functios, which provide the library calls.
The usage is the same as always

elpa1_compute.F90
all internal routines, which are used by ELPA1 and ELPA2, but
which are never called by the user. These functions are now "hidden"
in the module elpa1_compute, which is used by ELPA1 and ELPA2.

The procedures in elpa1_compute.F90 are identical to the ones in
elpa1.F90 before this split commit. The only -- but lot of --
changes are intendation.

This variables, do not have to be global, they can be parsed along
internally in ELPA. Removing them makes debugging more easy and
the public interface more lean

Current fix does as much blocking as possible, which should be
beneficial from both a compute and communication point of view.

Additionally, a second possible fix was added which just calls
the blocked version if the local matrix has a sufficient size.
This might create smaller and more messages at scale.

For some matrix/block size combinations the real case of ELPA2
crashes, e.g:

mpiexec -n 1 ./elpa2_test_real 50 50 32

leads to an error message
 ** On entry to DGEMM parameter number  3 had an illegal value
 and a crash.

This only seems to happen with matrix size smaller than 64*64.
he code path responsible for this has been identified, but the problem
tself is not yet solved!

The part of the code, which causes these crashes, has been switched on
as default by Intel in commit fe63372d. The rest of the commit fe63372d
seems to be fine, and is performance critical.

As an intermediate step, the responsible code path is switched off again
as default, this will be changed again once the underlying root cause
has been solved.

The API versioning number was not updated correctly at the release.
This lead to a wrong soname.

This is fixed now

Due to the efforts of Intel, ELPA features now build-in
support of AVX2 and FMA for the latest Intel processors

Point more clearly to the usage of ELPA under the terms of the LGPL.

Point more clearly to the usage of ELPA under the terms of the LGPL.

Intel (thanks, especially A.Heinecke from Intel) there exists an
optimized version of ELPA with AVX2 support.

This merge includes all the optimizations done by Intel plus some
smaller changes which were necessary to incorperate these modifications.

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)

Inge Gutheil from FZ Juelich pointed out, that the
configure test for BGQ failed due to typos.
These are corrected now

complex cases

Create automatically two independent routines for real and complex
valued matrices

This commit is not ABI compatible

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

Also, introduce type checking for transpose and reduce_add routines

These files are always automatically generated by autooconf and should
not be in version control.

Andreas Gloess informed us about a memory leak in ELPA, which was
introduced in version 2013.11.008.

This memory leak is removed now again.

Note, that older versions of ELPA will not be fixed right now.

An "dangling" fi has been removed

Remove variables which are not needed (anymore)

The macros which define the functionality to test
for
 - a specific real/complex kernel (not all available kernels)

are now defined in files in the m4 directory