 11 Feb, 2016 1 commit


Andreas Marek authored
With the configure option "enablesingleprecision" ELPA1 is build with singleprecision (halfwords) only. The best precision in singleprecision (float or complex) is 2^23 ~ 1.2e7. The accuracy of the error residual of ELPA1 in singleprecision mode is of the order 1e4 to 1e5. The orthogonality of the EV's is fullfilled up to about ~1e6. Thus the precision of ELPA1 in singleprecision mode is roughly 100  1000 times less than the best achievable precison. This is consistent with the doubleprecision 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 1e2, the precision of the EVs is thus about 1e7/1e2 = 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 1e11 (5 orders of magnitude larger than the best theoretical precision) The best speedup 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

 04 Jan, 2016 1 commit


Andreas Marek authored
The Fortran variable declerations "variable type*[4,8,16]" is non Fortran standard. It might cause problem in the future. Furthermore, the usage of Fortran and C togehther is more clean if variables are defined according to C variable types. This is done, now for all the test programs

 11 Dec, 2015 2 commits


Andreas Marek authored
 the contact email is now: elpalibrary@mpcdf.mpg.de  the official website is now hosted at http://elpa.mpcdf.mpg.de

Andreas Marek authored
The Rechenzentrum Garching (RZG) has been renamed into the Max Planck Computing and Data Facility (MPCDF). This is reflected now in the adapted headers. In the near future, all references to the ELPA webside and the ELPA email will also be adapted.

 03 Nov, 2015 1 commit


Andreas Marek authored
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 "proofofconcept".

 16 Jun, 2015 1 commit


Andreas Marek authored
This commit is not ABI compatible, since it changes the interfaces of some routines Also, introduce type checking for transpose and reduce_add routines

 11 Mar, 2015 1 commit


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