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HISTORY
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####################################################
High Performance Conjugate Gradient Benchmark (HPCG)
####################################################
:Author: Jack Dongarra and Michael Heroux and Piotr Luszczek
:Revision: 3.0
:Date: November 11, 2015
===============
History of HPCG
===============
-----------
Version 3.0
-----------
* Added problem generation as a timed portion of the benchmark. This time is now
added to any time spent optimizing data structures and counted as overhead when
computing the official GFLOP/s rating. The total overhead time is divided by 500
to amortize its cost over 500 iterations.
* Added memory usage counting and reporting.
* Added memory bandwidth measurement and reporting.
* Added a "Quick Path" option to make obtaining results on production systems easier.
With this option, obtaining a rating will take only a few minutes. This option also
makes profiling and debugging easier. The Quick Path option is invoked by setting the
run time to zero, either in hpcg.dat or by using the --rt=0 option.
* Added a command line option (--rt=) to specify the run time.
* Made a few small changes to support easier builds on MS Windows.
* Changed the way the residual variance is computed to make sure it is zero if all
residual values are identical.
* Changed the order of array allocation in the reference code in order to improve
performance.
* Set the minimum iteration count for the optimized run to be the same as what is
used in the reference run.
-----------
Version 2.4
-----------
* Fixed (again) the FLOP count for DDOT and WAXPBY. We forgot that the
preamble is called many times.
-----------
Version 2.3
-----------
* Fixed the FLOP count for DDOT and WAXPBY. The operations in the preamble were
not being accounted for.
-----------
Version 2.2
-----------
* Reduced the penalty for optimization overhead by a factor of 10 (amortized over 10
sets of 50 reference iterations.
* Fixed a bug that did not account for increased iterations that can occur with
multicoloring reorderings.
* Fixed numerous other small bugs reported by HPCG users.
-----------
Version 2.1
-----------
* Fixed a small but important bug in ComputeProlongation_ref.cpp (- sign should be + sign).
-----------
Version 2.0
-----------
* Added support for a synthetic multigrid V cycle. Parameters include
the number of levels in the the grid hierarchy, number of pre and
post smoother steps.
* Refactored data classes to support needs for recursion in V cycle.
* Made simple modifications to make compilation on MS Windows easier.
This includes changing the format of output files to remove colons.
-----------
Version 1.1
-----------
* Added a simple code for users remove in order to indicate whether
optimization was done for dot-product, SPMV, SYMGS, or WAXPBY.
* Fixed a problem with computing the variance of results from multiple runs.
-----------
Version 1.0
-----------
* Changed the diagonal entry from 27 to 26 to influence convergence rate.
* Changed license file (COPYRIGHT) from 4-clause BSD (original BSD) to 3-clause
BSD (modified BSD)
* Added a line to the input file (hpcg.dat) that allows to specify time to run
the benchmark.
-----------
Version 0.5
-----------
* Improved the formula used for scaling of departure of symmetry
-----------
Version 0.4
-----------
* Fixed bugs in integer computations where intermediate 32-bit
integer computations resulted in values that exceeded the
32-bit range and gave incorrect results.
* Fixed the computation of the number of CG set runs to take
into account varying timing results across MPI processes.
-----------
Version 0.3
-----------
* Given out to friendly testers.
* Includes Doxygen output.
* Numerous small changes.
* Substantially improved output.
* Tested on large systems.
-----------
Version 0.2
-----------
* Given out to "friends".
* Numerous small changes.
-----------
Version 0.1
-----------
* Added local symmetric Gauss-Seidel preconditioning.
* Changed global geometry to be true 3D. Previously was a beam (subdomains
were stacked only in the z dimension).
* Introduced three global/local index modes: 32/32, 64/32, 64/64 to handle all
problem sizes.
* Changed execution strategy to perform multiple runs with just a few
iterations per run.
* Added infrastructure and rules for user adaptation of kernels for performance
optimization.
* Added benchmark modification and reporting rules.
* Changed directory and file layout to mimic HPL layouts where appropriate.
================
History of HPCCG
================
--------------------------
NAME CHANGE: HPCCG to HPCG
--------------------------
* The name was changed from HPCCG to HPCG without any code changes.
-----------
Version 1.0
-----------
* Released as part of Mantevo Suite 1.0, December 2012.
-----------
Version 0.5
-----------
* Added timing for Allreduce calls in MPI mode, printing min/max/avg times.
* Set the solver tolerance to zero to make all solves take ``max_iter``
iterations.
* Changed accumulator to a local variable for ``ddot``. It seems to help
dual-core performance.
-----------
Version 0.4
-----------
* Made total_nnz a "long long" so that MFLOP numbers were valid
when the nonzero count is more than 2^31.
-----------
Version 0.3
-----------
* Fixed a performance bug in ``make_local_matrix.cpp`` that was very noticeable
when the fraction of off-processor grid points was large.
-----------
Version 0.2
-----------
* Fixed bugs related to turning MPI compilation off.
* Added more text to README to improve understanding.
* Added new ``Makfile.x86linux.gcc`` for non-opteron systems.
* Made ``MPI_Wtime`` the default timer when in MPI mode.
-----------
Version 0.1
-----------
HPCCG (Original version) was written as a teaching code for illustrating the
anatomy of a distributed memory parallel sparse iterative solver for new
research students and junior staff members. March 2000.