Apply some feedback
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47886bb07b
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5 changed files with 49 additions and 49 deletions
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@ -104,7 +104,7 @@
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\end{center}
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\end{frame}
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\begin{frame}{Trois goulots d'étranglement}
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\begin{frame}{Trois goulots d'étranglement étudiés}
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\begin{tightitemize}{1em}
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\pause
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\begin{columns}[T]
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@ -75,19 +75,7 @@
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% \end{itemize}
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%\end{frame}
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\begin{frame}{Code analyzers}
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\begin{itemize}
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\item That predict performance of a piece of assembly
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\item Features microarchitectural models
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\item Most often static analyzers
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\item Predict at least the \emph{reverse-throughput} $\cyc{\kerK}$ of a
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kernel $\kerK$ (cycles per iteration)
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\item May derive further useful metrics, \eg{} bottlenecks, by
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inspecting their model at will
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\end{itemize}
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\end{frame}
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\begin{frame}{What can be analyzed?}
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\begin{frame}{What do we analyze?}
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Pieces of code referred as \alert{``microkernels''}:
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\begin{itemize}
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@ -100,6 +88,17 @@
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Reasonable hypotheses for the category of codes worth optimizing this way!
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\end{frame}
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\begin{frame}{Code analyzers}
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\begin{itemize}
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\item Predict performance of a microkernel
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\item Features microarchitectural models
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\item Most often static analyzers
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\item Predict at least the \alert{\emph{reverse-throughput}} of a kernel (cycles per iteration)
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\item May derive further useful metrics, \eg{} bottlenecks, by
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inspecting their model at will
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\end{itemize}
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\end{frame}
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\begin{frame}{Existing code analyzers}
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\begin{itemize}
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\item Intel \alert{\iaca{}}: proprietary, Intel CPUs only. First
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@ -160,32 +160,34 @@ Gus & 0.00 & 20.37 & 30.59 & 0.82 & 188.04 \\
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\textbf{Crucial difference:}
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\end{center}
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\newcommand{\lsthlA}[1]{\texttt{\color[HTML]{df018a}#1}}
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\newcommand{\lsthlB}[1]{\texttt{\color[HTML]{d88900}#1}}
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\begin{minipage}[t]{0.47\textwidth}
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\begin{center}
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\textbf{\color{red}Bad}
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\textbf{{\color{red}Bad}\onslide<2->{: reduction}}
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\end{center}
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\vspace{-1em}
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\begin{lstlisting}[language={[ANSI]C}]
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for(c3)
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tmp[c1] += A[c1][c3] * x[c3];
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for((§\lsthlA{c3}§))
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tmp[(§\lsthlB{c1}§)] += A[c1][c3] * x[c3];
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\end{lstlisting}
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\end{minipage}
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\hfill\vrule\hfill
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\begin{minipage}[t]{0.47\textwidth}
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\begin{center}
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\textbf{\color[HTML]{008f0c}Good}
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\textbf{{\color[HTML]{008f0c}Good}\onslide<2->{: map}}
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\end{center}
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\vspace{-1em}
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\begin{lstlisting}[language={[ANSI]C}]
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for(c3)
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A[c1][c3] += u1[c1] * v1[c3]
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for((§\lsthlA{c3}§))
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A[c1][(§\lsthlA{c3}§)] += u1[c1] * v1[c3]
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+ u2[c1] * v2[c3];
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\end{lstlisting}
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\end{minipage}
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\pause{}
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\begin{center}
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\alert{\textbf{Dependencies through memory!}}
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\onslide<3->{\alert{\textbf{Dependencies through memory!}}}
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\end{center}
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\end{frame}
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@ -4,9 +4,9 @@
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\begin{minipage}[c]{0.35\textwidth}
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\begin{lstlisting}[language={[x86masm]Assembler}, numbers=none]
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0: mov (%rax), %rcx
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0: mov (%rax), (§\alert{\reg{rcx}}§)
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...
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3: add %rcx, %rdx
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3: add (§\alert{\reg{rcx}}§), %rdx
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\end{lstlisting}
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\end{minipage}\hfill
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\begin{minipage}[c]{0.5\textwidth}
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@ -17,7 +17,7 @@
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\end{minipage}
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\begin{center}
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3 $\rightarrow$ 0 through \reg{rcx}
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0 $\to$ 3 through \reg{rcx}
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\end{center}
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\end{frame}
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@ -37,18 +37,17 @@ loop:
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\end{minipage}\hfill
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\begin{minipage}[c]{0.40\textwidth}
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\begin{lstlisting}[language={[x86masm]Assembler}, numbers=none]
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0,0: add %rcx, %rdx
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0: add %rcx, %rdx
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...
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0,3: mov (%rax), %rcx
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1,0: add %rcx, %rdx
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3: mov (%rax), (§\alert{\reg{rcx}}§)
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0: add (§\alert{\reg{rcx}}§), %rdx
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...
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1,3: mov (%rax), %rcx
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3: mov (%rax), %rcx
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\end{lstlisting}
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\end{minipage}
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\begin{center}
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1,0 $\rightarrow$ 0,3 through \reg{rcx}\\
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\ie{} \alert{loop-carried 1 $\rightarrow$ 3}
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3 $\to$ 0 through \reg{rcx}, \alert{loop-carried}
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\end{center}
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\end{frame}
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@ -56,9 +55,9 @@ loop:
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\begin{frame}[fragile]{Dependencies, through memory}
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\begin{minipage}[c]{0.30\textwidth}
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\begin{lstlisting}[language={[x86masm]Assembler}, numbers=none]
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mov %r10, 4(%rax)
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mov %r10, (§\alert{4(\reg{rax})}§)
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add $4, %rax
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add (%rax), %rbx
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add (§\alert{(\reg{rax})}§), %rbx
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\end{lstlisting}
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\end{minipage}\hfill
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\begin{minipage}[c]{0.68\textwidth}
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@ -124,7 +123,7 @@ int fibo(int* F, int n) {
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\newcommand{\unk}{{\color{gray}?}}
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\newcommand{\h}{\cellcolor[HTML]{D0ECFF}}
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\newcommand{\w}{\cellcolor[HTML]{d6bf86}}
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\newcommand{\dep}[1]{{\color{red}$\veryshortarrow$\,#1}}
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\newcommand{\dep}[1]{{\color{red}#1\,$\to$}}
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\begin{columns}
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\column{\dimexpr\paperwidth-8pt}
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\centering
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@ -158,28 +157,28 @@ int fibo(int* F, int n) {
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Start & \unk& \unk&& \unk & \unk & \unk & \unk & \unk & \\
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\midrule
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\pause{}
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0,0 & 100 & 200 && 200\h& \unk & \unk & \unk & \unk & \\
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0 & 100 & 200 && 200\h& \unk & \unk & \unk & \unk & \\
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\pause{}
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0,1 & 100 & 376 && 200 & 176\h& \unk & \unk & \unk & \\
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1 & 100 & 376 && 200 & 176\h& \unk & \unk & \unk & \\
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\pause{}
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0,2 & 100 & 376 && 200 & 176 & 376\w& \unk & \unk & \\
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2 & 100 & 376 && 200 & 176 & 376\w& \unk & \unk & \\
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\pause{}
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0,3 & \alert{104} & 376 && 200 & 176 & 376 & \unk & \unk & \\
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0,4 & 104 & 376 && 200 & 176 & 376 & \unk & \unk & \\
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3 & \alert{104} & 376 && 200 & 176 & 376 & \unk & \unk{} & \\{} % Oskour.
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4 & 104 & 376 && 200 & 176 & 376 & \unk & \unk & \\
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\midrule
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\pause{}
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1,0 & 104 & \alert{176} && 200 & 176\h& 376 & \unk & \unk & \\
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0 & 104 & \alert{176} && 200 & 176\h& 376 & \unk & \unk & \\
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\pause{}
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1,1 & 104 & \alert{552} && 200 & 176 & 376\h& \unk & \unk & \dep{-1,2}\\
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1 & 104 & \alert{552} && 200 & 176 & 376\h& \unk & \unk & \dep{-1,2}\\
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\pause{}
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1,2 & 104 & 552 && 200 & 176 & 376 & 552\w& \unk & \\
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2 & 104 & 552 && 200 & 176 & 376 & 552\w& \unk & \\
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\midrule
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\pause{}
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2,0 & 108 & \alert{376} && 200 & 176 & 376\h& 552 & \unk & \dep{-2,2}\\
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0 & 108 & \alert{376} && 200 & 176 & 376\h& 552 & \unk & \dep{-2,2}\\
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\pause{}
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2,1 & 108 & \alert{928} && 200 & 176 & 376 & 552\h& \unk & \dep{-1,2}\\
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1 & 108 & \alert{928} && 200 & 176 & 376 & 552\h& \unk & \dep{-1,2}\\
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\pause{}
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2,2 & 108 & 928 && 200 & 176 & 376 & 552 & 928\w &\\
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2 & 108 & 928 && 200 & 176 & 376 & 552 & 928\w &\\
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\bottomrule{}
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\end{tabular}
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\end{minipage}\hfill
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@ -269,7 +268,7 @@ int fibo(int* F, int n) {
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\multirow{2}{*}{Full} & \uica{} & 29.59 & 18.26 & 0.58\\
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& + \staticdeps{} & 19.15 & 14.44 & 0.81\\
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\midrule
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\multirow{2}{*}{Pruned} & \uica{} & 18.42 & 11.96 & 0.80\\
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\multirow{2}{*}{Trim} & \uica{} & 18.42 & 11.96 & 0.80\\
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& + \staticdeps{} & 18.77 & 12.18 & 0.80\\
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\bottomrule
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\end{tabular}
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@ -15,7 +15,7 @@
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captionpos=b, % sets the caption-position to bottom
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commentstyle=\color{color_comment}, % comment style
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% deletekeywords={...}, % if you want to delete keywords from the given language
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% escapeinside={\%*}{*)}, % if you want to add LaTeX within your code
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escapeinside={(§}{§)}, % if you want to add LaTeX within your code
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extendedchars=true, % lets you use non-ASCII characters; for 8-bits encodings only, does not work with UTF-8
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frame=none, % adds a frame around the code
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keepspaces=true, % keeps spaces in text, useful for keeping indentation of code (possibly needs columns=flexible)
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