added slide for copy to cpu if dirty

studouglas · Apr 15, 2016 · 2640fc4 · 2640fc4
1 parent b6eba71
commit 2640fc4
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diff --git a/Documentation/FinalPresentation/Presentation.pdf b/Documentation/FinalPresentation/Presentation.pdf
diff --git a/Documentation/FinalPresentation/Presentation.tex b/Documentation/FinalPresentation/Presentation.tex
@@ -145,7 +145,7 @@ \subsection{Easily Enable/Disable GPU Acceleration}
 \begin{itemize}
 \item Existing projects can use GPU acceleration without having to change any code 
 \item Flag during build phase enables/disables GPU acceleration
-\item Interface remains the same\footnote{implementation 1 only}, acceleration happens ``invisibly''
+\item Interface remains the same\footnote{implementation 1 only}, acceleration happens behind the scenes
 \end{itemize}
 \end{frame}
 
@@ -248,6 +248,23 @@ \subsection{Impl. 1: Existing Module in GPU Memory}
 \end{center}
 \end{frame}
 
+\begin{frame}[fragile]
+\frametitle{memcpy optimization}
+\begin{itemize}
+\item Keep track of which version of the data is most up-to-date
+\item Only copy data when it has been modified
+\end{itemize}
+\begin{block}{CopyToCpuIfDirty}
+\begin{lstlisting}
+if(isDataDirtyHost){
+   cudaMemcpy(h_theData, d_theData, nEntries);
+   isDataDirtyHost = false;
+}
+\end{lstlisting}
+\end{block}
+
+\end{frame}
+
 \subsubsection{Implementation of Select Methods on GPU}
 \begin{frame}[fragile]
 \frametitle{Impl. 1 -- \texttt{Times}}