TikZ

• http://math.et.info.free.fr/TikZ/bdd/TikZ-Impatient.pdf
• https://pgf-tikz.github.io
• http://pgoutet.free.fr/latex/seance_10/seance_10.pdf

\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc} 
\usepackage{tikz}
\usepackage[francais]{babel}
\usetikzlibrary{babel}
% ...
 
\begin{document}
\shorthandoff{:}%
\usetikzlibrary{arrows.meta}
\shorthandon{:}%
 
% ...

\usepackage{tikz}
 
\usetikzlibrary{shapes} % for ellipses, after \begin{document}
 
\begin{figure}[ht]
    \centering
    \begin{tikzpicture}[thick,scale=0.8, every node/.style={scale=0.8}]
		\node[draw,ellipse](0) at (0,0) {CPU};
		\node[draw,ellipse](1) at (0,-2) {CPU};
		\node[draw,ellipse](2) at (3,0) {CPU};
		\node[draw,ellipse](3) at (3,-2) {CPU};
		\draw (-2,1)-- (5,1);
		\draw (-2,1)-- (-2,-3);
		\draw (-2,-3)-- (5,-3);
		\draw (5,1)-- (5,-3);
 
		\node[draw,ellipse](4) at (10,0) {*PU};
		\node[draw](5) at (13,0) {Mémoire};
		\draw (8,1)-- (15,1);
		\draw (8,1)-- (8,-1);
		\draw (15,1)-- (15,-1);
		\draw (8,-1)-- (15,-1);
 
		\node[draw,ellipse](6) at (10,-3) {*PU};
		\node[draw](7) at (13,-3) {Mémoire};
		\draw (8,-2)-- (15,-2);
		\draw (8,-2)-- (8,-4);
		\draw (15,-2)-- (15,-4);
		\draw (8,-4)-- (15,-4);
 
		\node[draw](8) at (3,-4) {Mémoire};
 
		\node[draw](9) at (10,-5) {Réseau};
 
		\draw (6.5,1)-- (6.5,-6);
		\draw (5,-1)-- (6.5,-1);
		\draw (6.5,0)-- (8,0);
		\draw (6.5,-3)-- (8,-3);
		\draw (8)-- (6.5,-4);
		\draw (6.5,-5)-- (9);
	\end{tikzpicture}
    \caption{Éléments constituant un nœud de supercalculateur}
\end{figure}

\usepackage{tikz}
 
\usetikzlibrary{arrows.meta} % for arrow shapes, after \begin{document}
 
\begin{figure}[ht]
    \centering
	\begin{tikzpicture}
		\node[draw,circle](01) at (-2,0) {0};
		\node[draw,circle](1) at (0,-2) {1};
		\node[draw,circle,dashed](02) at (-2,-2) {0};
		\node[draw,circle](2) at (0,-4) {2};
		\node[draw,circle,dashed](03) at (-2,-4) {0};
		\node[draw,circle](3) at (0,-6) {3};
		\node[draw,circle,dashed](04) at (-2,-6) {0};
		\node[draw,circle](4) at (0,-8) {4};
		\node[draw,circle,dashed](05) at (-2,-8) {0};
		\node[draw,circle](5) at (0,-10) {5};
		\node[draw,circle,dashed](06) at (-2,-10) {0};
		\node[draw,circle](6) at (0,-12) {6};
 
 
		% or, simple arrow: \draw[->,>=latex] (a) -- (b)
		\draw[-{Latex[length=3mm]}] (-4,0) -- (-4,-12) node[above,midway,rotate=90]{Temps};
 
		\draw[-{Latex[length=3mm]}] (01) -- (1);
		\draw[-{Latex[length=3mm]},dashed] (01) -- (02);
		\draw[-{Latex[length=3mm]}] (02) -- (2);
		\draw[-{Latex[length=3mm]},dashed] (02) -- (03);
		\draw[-{Latex[length=3mm]}] (03) -- (3);
		\draw[-{Latex[length=3mm]},dashed] (03) -- (04);
		\draw[-{Latex[length=3mm]}] (04) -- (4);
		\draw[-{Latex[length=3mm]},dashed] (04) -- (05);
		\draw[-{Latex[length=3mm]}] (05) -- (5);
		\draw[-{Latex[length=3mm]},dashed] (05) -- (06);
		\draw[-{Latex[length=3mm]}] (06) -- (6);
	\end{tikzpicture}
\end{figure}

\draw  node[fill,circle,scale=0.3]{} (0,0);

Source

\draw[orange,ultra thick,rounded corners] (0.316,0.782) rectangle (0.402,0.807);
\path (0.316,0.807) --  (0.402,0.807) node[midway,above,orange] {\textbf{A}}; % reprend les coordonnées du côté haut du rectangle

Source

\begin{tikzpicture}
    \node[anchor=south west,inner sep=0] (image) at (0,0) {\includegraphics[width=0.9\textwidth]{some_image.jpg}};
    \begin{scope}[x={(image.south east)},y={(image.north west)}]
        % Ces trois commandes suivantes permettent d'afficher une grille qui aide à visualiser les coordonnées des éléments à dessiner:
        \draw[help lines,xstep=.1,ystep=.1] (0,0) grid (1,1);
        \foreach \x in {0,1,...,9} { \node [anchor=north] at (\x/10,0) {0.\x}; }
        \foreach \y in {0,1,...,9} { \node [anchor=east] at (0,\y/10) {0.\y}; }
    \end{scope}
\end{tikzpicture}