User: eschnett Date: 2011/11/07 01:58 PM

Modified: / ET.tex

Log: Add scaling graph to Carpet section

File Changes:

Directory: / ============

File [modified]: ET.tex Delta lines: +25 -1 =================================================================== --- ET.tex 2011-11-07 19:54:01 UTC (rev 171) +++ ET.tex 2011-11-07 19:58:45 UTC (rev 172) @@ -542,7 +542,29 @@

{\tt Carpet} is the main driver used today for {\tt Cactus}-based astrophysical simulations. {\tt Carpet} offers hybrid MPI/OpenMP parallelization and is -used in production on up to several thousand cores. We estimate that, +used in production on up to several thousand cores. +\begin{figure} + \centering + \includegraphics[width=0.5\textwidth]{cactus-benchmarks/results-best} + \caption{Results from weak scaling tests evolving the Einstein + equations on a mesh refinement grid structure with nine levels. + This shows the time required per grid point, + where smaller numbers are + better, and ideal scaling would be a horizontal line. This + demonstrates excellect scalability to up to more than 10,000 + cores. Including hydrodynamics approximately doubles + calculation times without negatively influencing scalability.} + \label{fig:weak-scaling} +\end{figure} +Figure \ref{fig:weak-scaling} shows a weak scaling test of \texttt{Carpet}, +where \texttt{McLachlan} (see section \ref{sec:Kevol} below) solves +the Einstein equations on a grid structure with +nine levels of mesh refinement. This demonstrates excellent +scalability up to more than ten thousand cores. (In production +simulations, smaller and more complex grid structures and other +necessary tasks reduce scalability by about a factor of ten.) + +We estimate that, in 2010, about 7,000 core years of computing time (45 million core hours) were used via {\tt Carpet} by more than a dozen research groups world-wide. To date, more than 90 peer-reviewed publications and more @@ -2891,6 +2913,8 @@ as on the NSF Teragrid under allocation TG-MCA02N014, DOE repository m152, HLRB at the LRZ, and Compute Canada project cfz-411-aa.

+\section*{References} + \bibliographystyle{iopart-num-edit} %\bibliographystyle{amsplain-url} % TODO: all references should be in manifest/einsteintoolkit