11/24/2013: Elemental 0.82

elemental-0.82.tgz

Documentation: [HTML] [PDF]

New Functionality

Fundamental additions

  • LU with full pivoting

  • Various (blocked when possible) pivoted LDL factorizations

  • Accurate symmetric/Hermitian inversion

  • Hermitian inertia

  • Blocked pivoted Cholesky factorization

  • Two-norm estimation

  • Preliminary Spectral Divide and Conquer algorithm for Schur decomposition

  • Preliminary Spectral Divide and Conquer algorithm for Hermitian EVD

  • Preliminary TSQR and TS-SVT implementations

Minor/incremental improvements

  • Added Gaussian, Wigner, and Haar matrices

  • Added UpdateDiagonal for adding a constant to the diagonal of a matrix

  • Added move semantics for Matrix and DistMatrix

  • Added QuasiDiagonal{Scale,Solve}

  • Added SymmetricSwap

  • Added support for relative thresholding in SVD and SVT

  • Extended condition number support, see Condition

  • Extended sorting to allow for ascending or descending, see Sort

  • Axpy now supports arbitrary distributions

  • All distributions now connected via operator=

  • DistMatrix redesigned in terms of {Row,Col,Dist,Redundant,Cross}Comm’s

  • Higher-quality random number generation through std::mt19937 Mersenne twister

Maintenance

Library bugfixes

  • Avoiding implicit int -> MPI_Comm conversions in Grid constructors

  • {Hermitian,Normal}UniformSpectrum now rotate diagonal matrix through a Haar similarity instead of a random Householder transformation

  • Fixed mistake in matrix sign function

  • Fixed mistake in unaligned AxpyTriangle

Instrumentation/visualization/testing

  • Higher-quality timers via std::chrono

Maintenance/syntax

  • Base<F> template alias

  • elem::Complex is now a template alias for the improved std::complex

  • Using _Pragma to simplify OpenMP directives

  • Switched away from integer templates to typedefs, i.e., Int and Unsigned

  • Added {Logic,Runtime}Error shortcuts for ‘throw std::{logic,runtime}_error’

  • Modified partially-pivoted LU and GaussianElimination to use ValueInt

  • Removed obsolete TwoNorm{Lower,Upper}Bound

  • Renamed ‘Trtrsm’ to ‘Trstrm’ (TRiangular Solve with TRiangular Matrix)

  • Renamed ‘SingularValueSoftThresholding’ to ‘SVT’

  • Renamed ‘Alignment’ to ‘Align’ in most of the library

  • Moved pivoting routines from lapack-like/ to blas-like/ folder

  • Simplified ApplyPackedReflectors, HermitianEig, and Transpose implementations

  • Simplified LDL and avoided modification of above-diagonal entries

Documentation

  • Added README to almost every directory

  • Greatly improved TODO list

  • Moved Sphinx documentation to elemental-web repository

Build system

  • C++11 is now required

  • Added support for Qt5 into elemvariables

  • Fixed mistakes in compilation of sample code during configuration

  • Directly testing for ‘collapse’ OpenMP directive to avoid Clang issue

  • Improved toolchains for Vesta, and added GNU toolchain for Stampede

Python interface

  • Functioning but not yet supporting all additions since 0.81

MPI and Threading

  • Added simplified MPI wrappers and prefixed versions which use tags with ‘Tagged’, e.g., ‘TaggedSend’

Thanks

  • Jed Brown for contributing a patch which removed several unused variables

  • Michael Grant for updating the Python interface to handle integer typedef’ing

  • Jeff Hammond for contributing toolchain file updates for Blue Gene/Q