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\begin{table}
\tiny
\resizebox{\columnwidth}{!}{
\begin{tabular}{lm{0.2\linewidth}m{0.25\linewidth}m{0.3\linewidth}l}
\toprule
Project & Simulation Technique & Focus & Stakeholders & Modelling Capability \\
\midrule
ExaDigiT~\cite{DBLP:conf/sc/BrewerMKWBHSGGW24} & CFD/HT, AI/ML & Energy Loss\newline Prediction, Heat\newline Modelling & HPC Engineers and Operators & 3D\textsuperscript{$\star$}, CH\textsuperscript{$\dingasterisk$}, VP\textsuperscript{$\star$}, PE\textsuperscript{$\dingasterisk$}, RA, SE\textsuperscript{$\thermod$} \\
\midrule
SmartDC~\cite{DBLP:conf/noms/ZhangZLZWC22} & CFD/HT, BIM, AI/ML & Heat Modelling,\newline PUE optimization & Cloud Datacenter Engineers & CH\textsuperscript{$\thermod$}, PE, 3D\textsuperscript{$\star$} \\
\midrule
DyTwin~\cite{DBLP:conf/sc/TaheriBPRHDEWPM24} & Gaussian Process Regression, AI/ML & Anomaly Detection & Cloud Datacenter Operators & A\textsuperscript{$\star$}, FD, VP\textsuperscript{$\star$}, SE\textsuperscript{$\thermod$} \\
\midrule
ChatTwin~\cite{DBLP:conf/sensys/LiW0Z0T23} & \textbf{\footnotesize?} & Digital Twin\newline Definition Language & Cloud Datacenter Engineers & 3D\textsuperscript{$\star$} \\
\midrule
Reducio~\cite{DBLP:conf/sensys/CaoW0022} & POD, Gaussian\newline Process Modelling (ML) & Heat Modelling & Edge and Hyper-scale Datacenter Operators & CH\textsuperscript{$\dingasterisk$}, 3D\textsuperscript{$\star$}, SE \\
\midrule
NetGraph~\cite{DBLP:conf/sigcomm/HongWDSSHZY21} & Graphs & Network Management & Cloud Datacenter Operators & VP\textsuperscript{$\star$}, RA\textsuperscript{$\star$}
N\textsuperscript{$\star$}, SE\textsuperscript{$\thermod$} \\
\midrule
Kalibre~\cite{DBLP:conf/sensys/WangZD0TCWZ20} & CFD/HT, ML & Heat Modelling & Cloud Datacenter Engineers & CH\textsuperscript{$\dingasterisk$}, 3D\textsuperscript{$\star$} \\
\bottomrule
\end{tabular}
}
\end{table}
\tiny \textbf{Table 1.1:} Comparison of selected datacenter digital twins. \textbf{Modelling capability:} 3D = AR/VR Visualizations; CH = Cooling/Heat, PE = Power/Energy Consumption, A = Anomaly Detection, N = Network Modelling, SE = Scenario Exploration, VP = Virtual Prototyping, FD = Federation, RA = Resource Allocation; \textbf{Data Analytics}: $\dingasterisk$ = Predictive Analysis; $\star$ = Descriptive Analysis, $\thermod$ = Prescriptive Analysis.
% Autonomous decisions (autonomous twinning) from~\cite{DBLP:conf/sc/BrewerMKWBHSGGW24} is inherent to digital twinning -- it is better left unsaid in the table.
% I.e., the foundation of any DT is autonomous decisions, so without them they don't qualify as a DT.
% ChatTwin mentions that they evaluate their system on their own-engineered digital twin, but they absolutely not name it. Who knows why.
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