20140204-HPCGSuggestions.tex

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\title{Suggested changes for HPCG}
\author{{\bf Jed Brown} \texttt{jedbrown@mcs.anl.gov}}

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{ \small
  Mathematics and Computer Science Division, Argonne National Laboratory \\
  {\small Department of Computer Science, University of Colorado Boulder}
}

\date{HPCG \\ 2014-02-04}

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\subject{Talks}


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\begin{frame}{Proposed changes to HPCG}
  \begin{itemize}
  \item F-cycle multigrid
    \begin{itemize}
    \item Multiscale communication, actually solves a problem (optimally)
    \item Mathematically clean, less discretionary decisions needed
    \end{itemize}
  \item Chebyshev(2) smoother
    \begin{itemize}
    \item Avoids fixing a scale for multiplicativeness in Red-Black GS
    \item Enables pipelining/fusion, stresses cache
    \end{itemize}
  \item Unassembled matrix representation
    \begin{itemize}
    \item Increase arithmetic intensity (1/6 to $\approx 10$) and integer issue
    \item FE vs FD/FV?  Scalar or vector problem?
    \item $Q_2$ FE and/or elasticity puts more pressure on cache and registers
    \end{itemize}
  \item Quantify dynamic range
    \begin{itemize}
    \item Ratio between filling memory and $50\%$ efficiency
    \item Helps understand strong scaling/turn-around time
    \end{itemize}
  \end{itemize}
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