LAPACK 3.6.1
============

Release date: 06/16.

This material is based upon work supported by the National Science Foundation
and the Department of Energy under Grant No. NSF-OCI-1032861, NSF-CCF-00444486,
NSF-CNS 0325873, NSF-EIA 0122599, NSF-ACI-0090127, DOE-DE-FC02-01ER25478,
DOE-DE-FC02-06ER25768.

LAPACK is a software package provided by Univ. of Tennessee, Univ. of
California, Berkeley, Univ. of Colorado Denver and NAG Ltd..


1. Support and questions:
-------------------------

http://icl.cs.utk.edu/lapack-forum/

2. Thanks
---------

Thanks for bug-report/patches/suggestions to:


Forum users:
     

3. LAPACK 3.6.1: What's new
---------------------------

* [Mark Gates, UTK] *blocked back-transformation for the non-symmetric eigenvalue problem*

It blocks NB gemv calls into one gemm call inside trevc. 
To do that, it needs a new routine, trevc3, because unfortunately the lwork was not passed into trevc.
Attached is the performance speedup for dgeev. It gives a nice 1.5x speedup for N=20000, and that appears to still be increasing with N.
This is not the improvements that Greg Henry recently provided for doing the triangular solves as BLAS-3 instead of BLAS-1.
That will take a while to process, but we expect another, even larger increase in performance when those changes are applied. 
This also does not include doing multiple (BLAS-1) triangular solves in parallel, which is available in MAGMA, since that requires OpenMP or pthreads. 

Added:

	SRC/strevc3.f
	SRC/dtrevc3.f
	SRC/ctrevc3.f
	SRC/ztrevc3.f

Modified:

	SRC/sgeev.f
	SRC/dgeev.f
	SRC/cgeev.f
	SRC/zgeev.f
	SRC/sgeevx.f
	SRC/dgeevx.f
	SRC/cgeevx.f
	SRC/zgeevx.f

3. External Contributors
------------------------


4. Thanks
---------


* Edward Smyth (NAG): r1683, r1684
* Tim Hopkins (University of Kent): r1734, r1735, r1764, r1765, r1766, r1764, r1765, r1766
* Eugene Chereshnev (Intel): r1670, r1737, r1759, r1760, r1761, r1762, r1763
* Dmitry Baksheev (Intel): r1686, r1687, r1689-r1730
* Alex Zotkevich (Intel): r1755, r1756, r1757, r1758
* Nathan Whitehead: r1740, r1742, r1744
* Lawrence Mulholland (NAG): r1649, r1654, r1655, r1656, r1688, r1746
* Orion Poplawski (NWRA): r1653, r1751, r1754
* Vladimir Chalupecky: r1752
* Pavel Holoborodko: r1648
* Julien Schueller: r1650, r1651, r1748, r1749
* Mathieu Faverge: r1658, r1662, r1663
* Martin Köhler  Max Planck Institute for Dynamics of Complex Technical Systems): r1660 
* Tracey Brendan: r1667, r1668
* Andreas Noack (MIT): 1669
* Berend Hasselman: r1671
* Sébastien Villemot: r1672, r1733
* Christoph Conrads: r1673
* Elena Ivanova (Oracle): r1674, r1675, r1676
* David Vowles: r1677, r1679
* Viswanathan Elumalai (University of Pittsburgh): r1681
* Mark Gates: r1739, r1750
* nathanw: r1740
* Nathan Whitehead: r1742, r1744


5. Developer list
-----------------

.Principal Investigators

    * Jim Demmel (University of California,  Berkeley, USA)
    * Jack Dongarra (University of Tennessee and ORNL, USA)
    * Julien Langou (University of Colorado Denver, USA)

.LAPACK developers involved in this release

    * Julie Langou (University of Tennessee, USA)
    * Osni Marques (University of California,  Berkeley, USA)
    * Lawrence Mulholland (NAG Ltd.)
    * Mark Gates (University of Tennessee, USA)
    * Igor Kozachenko  (University of California,  Berkeley, USA)

6. More details
----------------


7.  Bug Fix
-----------

link:errata_from_360_to_361.html[see here]

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