[Commits] [svn:einsteintoolkit] Paper_EinsteinToolkit_2010/ (Rev. 172)

[schnetter at cct.lsu.edu]

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