Add time benchmarking

report/report.tex

@@ -796,7 +796,7 @@ integrate the sampled data in the end.
 
 
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-\subsection{Benchmarking with \prog{perf}}
+\subsection{Benchmarking with \prog{perf}}\label{ssec:bench_perf}
 
 In the context of this internship, the main advantage of \prog{perf} is that it
 does a lot of stack unwinding. It also meets all the requirements from
@@ -863,9 +863,63 @@ CSmith code is notoriously hard to understand and edit.
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 \section{Results}
 
+\subsection{Hardware used}~\label{ssec:bench_hw}
+
+All the measures in this report were made on a computer with an Intel Xeon
+E3-1505M v6 CPU, with a clock frequency of $3.00$\,GHz and 8 cores. The
+computer has 32\,GB of RAM, and care was taken never to fill it and start
+swapping.
+
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 \subsection{Measured time performance}
-\todo{}
+
+The benchmarking, as described in Section~\ref{ssec:bench_perf}, of \ehelfs{}
+against the vanilla \prog{libunwind} (using the same methodology, only linking
+\prog{perf} against the vanilla \prog{libunwind}), gives the results in
+Table~\ref{table:bench_time}.
+
+\begin{table}[h]
+    \centering
+    \begin{tabular}{l r r r r r}
+        \toprule
+        \thead{Unwinding method} & \thead{Frames \\ unwound}
+            & \thead{Total time \\ unwinding ($\mu s$)}
+            & \thead{Average time \\ per frame ($ns$)}
+            & \thead{Unwinding \\ errors}
+            & \thead{Time ratio} \\
+        \midrule
+        \ehelfs{}
+            & 23506 % Frames unwound
+            & 14837 % Total time
+            & 631 % Avg time
+            & 1099 % # Errors
+            & 1
+            \\
+        \prog{libunwind}, cached
+            & 27058 % Frames unwound
+            & 441601 % Total time
+            & 16320 % Avg time
+            & 885 % # Errors
+            & 25.9
+            \\
+        \prog{libunwind}, uncached
+            & 27058 % Frames unwound
+            & 671292 % Total time
+            & 24809 % Avg time
+            & 885 % # Errors
+            & 39.3
+            \\
+        \bottomrule
+    \end{tabular}
+
+    \caption{Time benchmarking on hackbench}\label{table:bench_time}
+\end{table}
+
+It is also worth noting that on the machine described in
+Section~\ref{ssec:bench_hw}, the compilation of the \ehelfs{} at a level of
+\lstc{-O2} needed to run \prog{hackbench}, that is, \prog{hackbench},
+\prog{libc}, \prog{ld}, and \prog{libpthread} takes an overall time of $25.28$
+seconds (using only a single core).
 
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 \subsection{Measured compactness}\label{ssec:results_size}
@@ -882,6 +936,15 @@ CSmith code is notoriously hard to understand and edit.
 %% Bibliography %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \printbibliography{}
 
+%% License notice %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\hfill \begin{minipage}{0.7\textwidth}
+    \begin{flushright}
+        \itshape{} \small{}
+        Unless otherwise explicitly stated, any image or source code snippet
+        from the present document can be reused freely by anyone.
+    \end{flushright}
+\end{minipage}
+
 \end{document}
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