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Raspberry_Pi4_stress_test_edits.tex
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Raspberry_Pi4_stress_test_edits.tex
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\documentclass [oneside,10pt,a4paper,ngerman,BCOR10mm,headsepline,parindent,final]{scrartcl}
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\title{\textbf{\textsf{Stress tests for Raspberry Pi 4 and 3B+}}}
\author{Björn Kasper (\href{mailto:[email protected]}{[email protected]})}
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% prompt
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% Prevent overflowing lines due to hard-to-break entities
\sloppy
% Setup hyperref package
\hypersetup{
breaklinks=true, % so long urls are correctly broken across lines
bookmarksnumbered=true,
pdfauthor=Björn Kasper ([email protected]),
pdftitle=Stress tests for Raspberry Pi 4 and 3B+,
colorlinks=true,
urlcolor=urlcolor,
linkcolor=linkcolor,
citecolor=citecolor,
pdfpagemode={UseOutlines},
pdfview = {XYZ},
pdfstartview = {XYZ},
pdfstartpage = {1},
pdfborder={0 0 0}
}
% Slightly bigger margins than the latex defaults
\geometry{verbose,tmargin=1in,bmargin=1in,lmargin=1in,rmargin=1in}
\begin{document}
\pagestyle{empty}% Ohne den Nummerierungsstil zu ändern,
% Seitenzahlen und Kolumnentitel aus.
\maketitle\thispagestyle{empty}
\vfill
\noindent
\begin{tabular}{l l}
\begin{minipage}{0.24\textwidth}
\includegraphics{images/CC_BY-SA_40.png}
\end{minipage}
&
\begin{minipage}{0.68\textwidth}
This work is licensed under a \href{https://creativecommons.org/licenses/by-sa/4.0/}{Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA 4.0)}.
\end{minipage}
\end{tabular}
\newpage
\begin{abstract}
This is a test abstract.
\end{abstract}
\pagestyle{fancy} % eigenen Seitestil aktivieren}
\fancyhf{} % Alle Felder loeschen
% \fancyhead[EL,OL]{$header$}
% \fancyfoot[EL,OL]{$footer$}
\fancyhead[ER,OR]{\leftmark} % Kapitel/Abschnitt
\fancyfoot[ER,OR]{Seite \thepage} % Seitenzahl
\renewcommand{\sectionmark}[1]{
\markboth{\thesection{} #1}{}
}
\tableofcontents
\hypertarget{introduction}{%
\section{Introduction}\label{introduction}}
The aim of this notebook is to stress the Raspberry Pi 4 for deciding
between different cases and cooling types.
Sources:
\begin{itemize}
\tightlist
\item
\url{https://github.com/nschloe/stressberry}
\item
\url{https://www.pragmaticlinux.com/2020/06/check-the-raspberry-pi-cpu-temperature/}
\end{itemize}
\hypertarget{implementation-of-helper-functions}{%
\section{Implementation of helper
functions}\label{implementation-of-helper-functions}}
\hypertarget{load-globally-used-libraries-and-set-plot-parameters}{%
\subsection{Load globally used libraries and set plot
parameters}\label{load-globally-used-libraries-and-set-plot-parameters}}
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{1}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{k+kn}{import} \PY{n+nn}{subprocess}
\PY{k+kn}{import} \PY{n+nn}{os}
\PY{k+kn}{import} \PY{n+nn}{threading}
\PY{k+kn}{import} \PY{n+nn}{time}
\PY{k+kn}{import} \PY{n+nn}{smbus2}
\PY{k+kn}{import} \PY{n+nn}{bme280}
\PY{k+kn}{import} \PY{n+nn}{pandas} \PY{k}{as} \PY{n+nn}{pd}
\PY{k+kn}{import} \PY{n+nn}{numpy} \PY{k}{as} \PY{n+nn}{np}
\PY{k+kn}{import} \PY{n+nn}{prettytable} \PY{k}{as} \PY{n+nn}{pt}
\PY{k+kn}{import} \PY{n+nn}{matplotlib}\PY{n+nn}{.}\PY{n+nn}{pyplot} \PY{k}{as} \PY{n+nn}{plt}
\PY{k+kn}{import} \PY{n+nn}{matplotlib}\PY{n+nn}{.}\PY{n+nn}{dates} \PY{k}{as} \PY{n+nn}{mdates}
\PY{o}{\PYZpc{}}\PY{k}{matplotlib} inline
\PY{c+c1}{\PYZsh{} FutureWarning: Using an implicitly registered datetime converter for a matplotlib plotting method. }
\PY{c+c1}{\PYZsh{} The converter was registered by pandas on import. }
\PY{c+c1}{\PYZsh{} Future versions of pandas will require you to explicitly register matplotlib converters.}
\PY{k+kn}{from} \PY{n+nn}{pandas}\PY{n+nn}{.}\PY{n+nn}{plotting} \PY{k+kn}{import} \PY{n}{register\PYZus{}matplotlib\PYZus{}converters}
\PY{n}{register\PYZus{}matplotlib\PYZus{}converters}\PY{p}{(}\PY{p}{)}
\PY{k+kn}{from} \PY{n+nn}{IPython}\PY{n+nn}{.}\PY{n+nn}{display} \PY{k+kn}{import} \PY{n}{set\PYZus{}matplotlib\PYZus{}formats}
\PY{n}{set\PYZus{}matplotlib\PYZus{}formats}\PY{p}{(}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{pdf}\PY{l+s+s1}{\PYZsq{}}\PY{p}{,} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{png}\PY{l+s+s1}{\PYZsq{}}\PY{p}{)}
\PY{n}{plt}\PY{o}{.}\PY{n}{rcParams}\PY{p}{[}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{savefig.dpi}\PY{l+s+s1}{\PYZsq{}}\PY{p}{]} \PY{o}{=} \PY{l+m+mi}{80}
\PY{n}{plt}\PY{o}{.}\PY{n}{rcParams}\PY{p}{[}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{savefig.bbox}\PY{l+s+s1}{\PYZsq{}}\PY{p}{]} \PY{o}{=} \PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{tight}\PY{l+s+s2}{\PYZdq{}}
\PY{n}{plt}\PY{o}{.}\PY{n}{rcParams}\PY{p}{[}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{figure.autolayout}\PY{l+s+s1}{\PYZsq{}}\PY{p}{]} \PY{o}{=} \PY{k+kc}{False}
\PY{n}{plt}\PY{o}{.}\PY{n}{rcParams}\PY{p}{[}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{figure.figsize}\PY{l+s+s1}{\PYZsq{}}\PY{p}{]} \PY{o}{=} \PY{l+m+mi}{10}\PY{p}{,} \PY{l+m+mi}{6}
\PY{n}{plt}\PY{o}{.}\PY{n}{rcParams}\PY{p}{[}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{axes.labelsize}\PY{l+s+s1}{\PYZsq{}}\PY{p}{]} \PY{o}{=} \PY{l+m+mi}{18}
\PY{n}{plt}\PY{o}{.}\PY{n}{rcParams}\PY{p}{[}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{axes.titlesize}\PY{l+s+s1}{\PYZsq{}}\PY{p}{]} \PY{o}{=} \PY{l+m+mi}{20}
\PY{n}{plt}\PY{o}{.}\PY{n}{rcParams}\PY{p}{[}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{font.size}\PY{l+s+s1}{\PYZsq{}}\PY{p}{]} \PY{o}{=} \PY{l+m+mi}{16}
\PY{n}{plt}\PY{o}{.}\PY{n}{rcParams}\PY{p}{[}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{lines.linewidth}\PY{l+s+s1}{\PYZsq{}}\PY{p}{]} \PY{o}{=} \PY{l+m+mf}{2.0}
\PY{n}{plt}\PY{o}{.}\PY{n}{rcParams}\PY{p}{[}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{lines.markersize}\PY{l+s+s1}{\PYZsq{}}\PY{p}{]} \PY{o}{=} \PY{l+m+mi}{8}
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\PY{c+c1}{\PYZsh{} Need to install dependent package first via \PYZsq{}apt install cm\PYZhy{}super\PYZsq{}}
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\end{Verbatim}
\end{tcolorbox}
\begin{Verbatim}[commandchars=\\\{\}]
/home/bk/jupyter-env/lib/python3.7/site-packages/ipykernel\_launcher.py:24:
DeprecationWarning: `set\_matplotlib\_formats` is deprecated since IPython 7.23,
directly use `matplotlib\_inline.backend\_inline.set\_matplotlib\_formats()`
\end{Verbatim}
\hypertarget{variant-1-function-for-reading-the-cpu-core-temperature}{%
\subsection{Variant 1: Function for reading the CPU core
temperature}\label{variant-1-function-for-reading-the-cpu-core-temperature}}
This implementation retrieves the temperature information from the
system file \texttt{/sys/class/thermal/thermal\_zone0/temp}.
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{2}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{c+c1}{\PYZsh{} Function for reading the CPU core temperature}
\PY{c+c1}{\PYZsh{} Found here: https://www.pragmaticlinux.com/2020/06/check\PYZhy{}the\PYZhy{}raspberry\PYZhy{}pi\PYZhy{}cpu\PYZhy{}temperature/}
\PY{k}{def} \PY{n+nf}{get\PYZus{}cpu\PYZus{}temp\PYZus{}old}\PY{p}{(}\PY{p}{)}\PY{p}{:}
\PY{l+s+sd}{\PYZdq{}\PYZdq{}\PYZdq{}}
\PY{l+s+sd}{ Obtains the current value of the CPU temperature.}
\PY{l+s+sd}{ :returns: Current value of the CPU temperature if successful, zero value otherwise.}
\PY{l+s+sd}{ :rtype: float}
\PY{l+s+sd}{ \PYZdq{}\PYZdq{}\PYZdq{}}
\PY{c+c1}{\PYZsh{} Initialize the result.}
\PY{n}{result} \PY{o}{=} \PY{l+m+mf}{0.0}
\PY{c+c1}{\PYZsh{} The first line in this file holds the CPU temperature as an integer times 1000.}
\PY{c+c1}{\PYZsh{} Read the first line and remove the newline character at the end of the string.}
\PY{k}{if} \PY{n}{os}\PY{o}{.}\PY{n}{path}\PY{o}{.}\PY{n}{isfile}\PY{p}{(}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{/sys/class/thermal/thermal\PYZus{}zone0/temp}\PY{l+s+s1}{\PYZsq{}}\PY{p}{)}\PY{p}{:}
\PY{k}{with} \PY{n+nb}{open}\PY{p}{(}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{/sys/class/thermal/thermal\PYZus{}zone0/temp}\PY{l+s+s1}{\PYZsq{}}\PY{p}{)} \PY{k}{as} \PY{n}{f}\PY{p}{:}
\PY{n}{line} \PY{o}{=} \PY{n}{f}\PY{o}{.}\PY{n}{readline}\PY{p}{(}\PY{p}{)}\PY{o}{.}\PY{n}{strip}\PY{p}{(}\PY{p}{)}
\PY{c+c1}{\PYZsh{} Test if the string is an integer as expected.}
\PY{k}{if} \PY{n}{line}\PY{o}{.}\PY{n}{isdigit}\PY{p}{(}\PY{p}{)}\PY{p}{:}
\PY{c+c1}{\PYZsh{} Convert the string with the CPU temperature to a float in degrees Celsius.}
\PY{n}{result} \PY{o}{=} \PY{n+nb}{float}\PY{p}{(}\PY{n}{line}\PY{p}{)} \PY{o}{/} \PY{l+m+mi}{1000}
\PY{c+c1}{\PYZsh{} Give the result back to the caller.}
\PY{k}{return} \PY{n}{result}
\end{Verbatim}
\end{tcolorbox}
\hypertarget{variant-2-function-for-reading-the-cpu-core-temperature-used-here}{%
\subsection{Variant 2: Function for reading the CPU core temperature
(used
here)}\label{variant-2-function-for-reading-the-cpu-core-temperature-used-here}}
This implementation retrieves the temperature information from the
command line tool \texttt{vcgencmd}. In the bash console you can get the
same result by issuing:
\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{$ }\ExtensionTok{vcgencmd}\NormalTok{ measure_temp}
\end{Highlighting}
\end{Shaded}
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{5}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{c+c1}{\PYZsh{} Function for reading the CPU core temperature}
\PY{c+c1}{\PYZsh{} Found here: https://github.com/nschloe/stressberry/blob/main/stressberry/main.py}
\PY{k}{def} \PY{n+nf}{get\PYZus{}cpu\PYZus{}temp}\PY{p}{(}\PY{n}{filename}\PY{o}{=}\PY{k+kc}{None}\PY{p}{)}\PY{p}{:}
\PY{l+s+sd}{\PYZdq{}\PYZdq{}\PYZdq{}Returns the core temperature in Celsius.\PYZdq{}\PYZdq{}\PYZdq{}}
\PY{k}{if} \PY{n}{filename} \PY{o+ow}{is} \PY{o+ow}{not} \PY{k+kc}{None}\PY{p}{:}
\PY{k}{with} \PY{n+nb}{open}\PY{p}{(}\PY{n}{filename}\PY{p}{)} \PY{k}{as} \PY{n}{f}\PY{p}{:}
\PY{n}{temp} \PY{o}{=} \PY{n+nb}{float}\PY{p}{(}\PY{n}{f}\PY{o}{.}\PY{n}{read}\PY{p}{(}\PY{p}{)}\PY{p}{)} \PY{o}{/} \PY{l+m+mi}{1000}
\PY{k}{else}\PY{p}{:}
\PY{c+c1}{\PYZsh{} Using vcgencmd is specific to the raspberry pi}
\PY{n}{out} \PY{o}{=} \PY{n}{subprocess}\PY{o}{.}\PY{n}{check\PYZus{}output}\PY{p}{(}\PY{p}{[}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{vcgencmd}\PY{l+s+s2}{\PYZdq{}}\PY{p}{,} \PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{measure\PYZus{}temp}\PY{l+s+s2}{\PYZdq{}}\PY{p}{]}\PY{p}{)}\PY{o}{.}\PY{n}{decode}\PY{p}{(}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{utf\PYZhy{}8}\PY{l+s+s2}{\PYZdq{}}\PY{p}{)}
\PY{n}{temp} \PY{o}{=} \PY{n+nb}{float}\PY{p}{(}\PY{n}{out}\PY{o}{.}\PY{n}{replace}\PY{p}{(}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{temp=}\PY{l+s+s2}{\PYZdq{}}\PY{p}{,} \PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{\PYZdq{}}\PY{p}{)}\PY{o}{.}\PY{n}{replace}\PY{p}{(}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{\PYZsq{}}\PY{l+s+s2}{C}\PY{l+s+s2}{\PYZdq{}}\PY{p}{,} \PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{\PYZdq{}}\PY{p}{)}\PY{p}{)}
\PY{k}{return} \PY{n}{temp}
\end{Verbatim}
\end{tcolorbox}
\hypertarget{function-for-reading-the-cpu-core-frequency}{%
\subsection{Function for reading the CPU core
frequency}\label{function-for-reading-the-cpu-core-frequency}}
The frequency information is retrieved from the command line tool
\texttt{vcgencmd} also. In the bash console you can get the same result
by issuing:
\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{$ }\ExtensionTok{vcgencmd}\NormalTok{ measure_clock arm}
\end{Highlighting}
\end{Shaded}
Issue regarding the \textbf{Raspberry Pi 3B+} (2021-06-01):\\
With the latest Raspbian updates there seems to be a bug in reading the
CPU frequency with the otherwise propagated command line call
\texttt{vcgencmd\ measure\_clock\ arm}. With this call only frequencies
around 600 MHz are displayed even under full load of the CPU. The direct
query of the \texttt{/sys} device tree provides the correct results for
the first core:
\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{$ }\FunctionTok{cat}\NormalTok{ /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq}
\end{Highlighting}
\end{Shaded}
Therefore, the function has been extended to first query which Raspberry
Pi hardware is present. If it is a \textbf{RPi 3B+}, the current CPU
frequency is queried directly from the device tree instead of via the
\texttt{vcgencmd} tools.
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{6}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{c+c1}{\PYZsh{} Function for reading the CPU core frequency}
\PY{k}{def} \PY{n+nf}{get\PYZus{}cpu\PYZus{}freq}\PY{p}{(}\PY{n}{filename}\PY{o}{=}\PY{k+kc}{None}\PY{p}{)}\PY{p}{:}
\PY{k}{if} \PY{n}{os}\PY{o}{.}\PY{n}{path}\PY{o}{.}\PY{n}{isfile}\PY{p}{(}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{/sys/firmware/devicetree/base/model}\PY{l+s+s1}{\PYZsq{}}\PY{p}{)}\PY{p}{:}
\PY{k}{with} \PY{n+nb}{open}\PY{p}{(}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{/sys/firmware/devicetree/base/model}\PY{l+s+s1}{\PYZsq{}}\PY{p}{)} \PY{k}{as} \PY{n}{f}\PY{p}{:}
\PY{n}{hw\PYZus{}version} \PY{o}{=} \PY{n}{f}\PY{o}{.}\PY{n}{readline}\PY{p}{(}\PY{p}{)}\PY{o}{.}\PY{n}{strip}\PY{p}{(}\PY{p}{)}
\PY{c+c1}{\PYZsh{} RPi 3B+: there seems to be a bug in reading CPU frequency with \PYZsq{}vcgencmd\PYZsq{}}
\PY{k}{if} \PY{p}{(}\PY{n}{hw\PYZus{}version}\PY{o}{.}\PY{n}{startswith}\PY{p}{(}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{Raspberry Pi 3 Model B Plus}\PY{l+s+s1}{\PYZsq{}}\PY{p}{)}\PY{p}{)}\PY{p}{:}
\PY{k}{if} \PY{n}{os}\PY{o}{.}\PY{n}{path}\PY{o}{.}\PY{n}{isfile}\PY{p}{(}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{/sys/devices/system/cpu/cpu0/cpufreq/scaling\PYZus{}cur\PYZus{}freq}\PY{l+s+s1}{\PYZsq{}}\PY{p}{)}\PY{p}{:}
\PY{k}{with} \PY{n+nb}{open}\PY{p}{(}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{/sys/devices/system/cpu/cpu0/cpufreq/scaling\PYZus{}cur\PYZus{}freq}\PY{l+s+s1}{\PYZsq{}}\PY{p}{)} \PY{k}{as} \PY{n}{f}\PY{p}{:}
\PY{n}{line} \PY{o}{=} \PY{n}{f}\PY{o}{.}\PY{n}{readline}\PY{p}{(}\PY{p}{)}\PY{o}{.}\PY{n}{strip}\PY{p}{(}\PY{p}{)}
\PY{c+c1}{\PYZsh{} Test if the string is an integer as expected.}
\PY{k}{if} \PY{n}{line}\PY{o}{.}\PY{n}{isdigit}\PY{p}{(}\PY{p}{)}\PY{p}{:}
\PY{c+c1}{\PYZsh{} Convert the string with the CPU frequency to a float in MHz.}
\PY{n}{frequency} \PY{o}{=} \PY{n+nb}{float}\PY{p}{(}\PY{n}{line}\PY{p}{)} \PY{o}{/} \PY{l+m+mi}{1000}
\PY{c+c1}{\PYZsh{} RPi 4B: \PYZsq{}vcgencmd\PYZsq{} does work as expected ...}
\PY{k}{else}\PY{p}{:}
\PY{l+s+sd}{\PYZdq{}\PYZdq{}\PYZdq{}Returns the CPU frequency in MHz\PYZdq{}\PYZdq{}\PYZdq{}}
\PY{k}{if} \PY{n}{filename} \PY{o+ow}{is} \PY{o+ow}{not} \PY{k+kc}{None}\PY{p}{:}
\PY{k}{with} \PY{n+nb}{open}\PY{p}{(}\PY{n}{filename}\PY{p}{)} \PY{k}{as} \PY{n}{f}\PY{p}{:}
\PY{n}{frequency} \PY{o}{=} \PY{n+nb}{float}\PY{p}{(}\PY{n}{f}\PY{o}{.}\PY{n}{read}\PY{p}{(}\PY{p}{)}\PY{p}{)} \PY{o}{/} \PY{l+m+mi}{1000}
\PY{k}{else}\PY{p}{:}
\PY{c+c1}{\PYZsh{} Only vcgencmd measure\PYZus{}clock arm is accurate on Raspberry Pi.}
\PY{c+c1}{\PYZsh{} Per: https://www.raspberrypi.org/forums/viewtopic.php?f=63\PYZam{}t=219358\PYZam{}start=25}
\PY{n}{out} \PY{o}{=} \PY{n}{subprocess}\PY{o}{.}\PY{n}{check\PYZus{}output}\PY{p}{(}\PY{p}{[}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{vcgencmd}\PY{l+s+s2}{\PYZdq{}}\PY{p}{,} \PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{measure\PYZus{}clock arm}\PY{l+s+s2}{\PYZdq{}}\PY{p}{]}\PY{p}{)}\PY{o}{.}\PY{n}{decode}\PY{p}{(}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{utf\PYZhy{}8}\PY{l+s+s2}{\PYZdq{}}\PY{p}{)}
\PY{n}{frequency} \PY{o}{=} \PY{n+nb}{float}\PY{p}{(}\PY{n}{out}\PY{o}{.}\PY{n}{split}\PY{p}{(}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{=}\PY{l+s+s2}{\PYZdq{}}\PY{p}{)}\PY{p}{[}\PY{l+m+mi}{1}\PY{p}{]}\PY{p}{)} \PY{o}{/} \PY{l+m+mi}{1000000}
\PY{k}{return} \PY{n}{frequency}
\end{Verbatim}
\end{tcolorbox}
\hypertarget{function-for-reading-the-ambient-temperature}{%
\subsection{Function for reading the ambient
temperature}\label{function-for-reading-the-ambient-temperature}}
In order to compare the recorded CPU core temperatures of the different
housing and cooling scenarios, the temperature curves must be normalized
with the curves of the simultaneously measured ambient temperature.\\
However, only the curves of the so-called ``overtemperature'' are
comparable, which is the difference between the curves of the CPU core
temperature and the ambient temperature.
The external Bosch sensor \emph{BME280} is used to measure the ambient
temperature. This is connected to the Raspberry Pi via a USB-I2C
adapter. The installation of the required kernel module is described in
the Jupyter notebook \href{./BME280.ipynb}{BME280.ipynb}.
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{7}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{c+c1}{\PYZsh{} i2c bus on /dev/i2c\PYZhy{}11}
\PY{n}{port} \PY{o}{=} \PY{l+m+mi}{11}
\PY{c+c1}{\PYZsh{} i2c address of BME280}
\PY{n}{address} \PY{o}{=} \PY{l+m+mh}{0x76}
\PY{n}{bus} \PY{o}{=} \PY{n}{smbus2}\PY{o}{.}\PY{n}{SMBus}\PY{p}{(}\PY{n}{port}\PY{p}{)}
\PY{c+c1}{\PYZsh{} Function for reading the ambient temperature}
\PY{c+c1}{\PYZsh{} Found here: https://github.com/nschloe/stressberry/blob/main/stressberry/main.py}
\PY{k}{def} \PY{n+nf}{get\PYZus{}ambient\PYZus{}temp}\PY{p}{(}\PY{p}{)}\PY{p}{:}
\PY{l+s+sd}{\PYZdq{}\PYZdq{}\PYZdq{}Returns the ambient temperature in Celsius.\PYZdq{}\PYZdq{}\PYZdq{}}
\PY{n}{calibration\PYZus{}params} \PY{o}{=} \PY{n}{bme280}\PY{o}{.}\PY{n}{load\PYZus{}calibration\PYZus{}params}\PY{p}{(}\PY{n}{bus}\PY{p}{,} \PY{n}{address}\PY{p}{)}
\PY{c+c1}{\PYZsh{} the sample method will take a single reading and return}
\PY{c+c1}{\PYZsh{} a compensated\PYZus{}reading object}
\PY{n}{data\PYZus{}obj} \PY{o}{=} \PY{n}{bme280}\PY{o}{.}\PY{n}{sample}\PY{p}{(}\PY{n}{bus}\PY{p}{,} \PY{n}{address}\PY{p}{,} \PY{n}{calibration\PYZus{}params}\PY{p}{)}
\PY{k}{return} \PY{n}{data\PYZus{}obj}\PY{o}{.}\PY{n}{temperature}
\end{Verbatim}
\end{tcolorbox}
\hypertarget{helper-functions-for-stressing-all-cores-of-the-cpu}{%
\subsection{Helper functions for stressing all cores of the
CPU}\label{helper-functions-for-stressing-all-cores-of-the-cpu}}
Stress is created by the command line tool \texttt{stress}. It has to be
installed first by issuing:
\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{$ }\FunctionTok{sudo}\NormalTok{ apt install stress}
\end{Highlighting}
\end{Shaded}
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{8}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{c+c1}{\PYZsh{} Helper function to call the \PYZsq{}stress\PYZsq{} command line tool}
\PY{k}{def} \PY{n+nf}{stress\PYZus{}cpu}\PY{p}{(}\PY{n}{num\PYZus{}cpus}\PY{p}{,} \PY{n}{time}\PY{p}{)}\PY{p}{:}
\PY{n}{subprocess}\PY{o}{.}\PY{n}{check\PYZus{}call}\PY{p}{(}\PY{p}{[}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{stress}\PY{l+s+s2}{\PYZdq{}}\PY{p}{,} \PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{\PYZhy{}\PYZhy{}cpu}\PY{l+s+s2}{\PYZdq{}}\PY{p}{,} \PY{n+nb}{str}\PY{p}{(}\PY{n}{num\PYZus{}cpus}\PY{p}{)}\PY{p}{,} \PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{\PYZhy{}\PYZhy{}timeout}\PY{l+s+s2}{\PYZdq{}}\PY{p}{,} \PY{l+s+sa}{f}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+si}{\PYZob{}}\PY{n}{time}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{s}\PY{l+s+s2}{\PYZdq{}}\PY{p}{]}\PY{p}{)}
\PY{k}{return}
\end{Verbatim}
\end{tcolorbox}
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{9}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{c+c1}{\PYZsh{} Function for stressing all cores of the CPU}
\PY{c+c1}{\PYZsh{} Found here: https://github.com/nschloe/stressberry/blob/main/stressberry/main.py}
\PY{k}{def} \PY{n+nf}{run\PYZus{}stress}\PY{p}{(}\PY{n}{stress\PYZus{}duration}\PY{o}{=}\PY{l+m+mi}{300}\PY{p}{,} \PY{n}{idle\PYZus{}duration}\PY{o}{=}\PY{l+m+mi}{120}\PY{p}{,} \PY{n}{cores}\PY{o}{=}\PY{k+kc}{None}\PY{p}{)}\PY{p}{:}
\PY{l+s+sd}{\PYZdq{}\PYZdq{}\PYZdq{}Run stress test for specified duration with specified idle times}
\PY{l+s+sd}{ at the start and end of the test.}
\PY{l+s+sd}{ \PYZdq{}\PYZdq{}\PYZdq{}}
\PY{k}{if} \PY{n}{cores} \PY{o+ow}{is} \PY{k+kc}{None}\PY{p}{:}
\PY{n}{cores} \PY{o}{=} \PY{n}{os}\PY{o}{.}\PY{n}{cpu\PYZus{}count}\PY{p}{(}\PY{p}{)}
\PY{n+nb}{print}\PY{p}{(}\PY{l+s+sa}{f}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Preparing to stress [}\PY{l+s+si}{\PYZob{}}\PY{n}{cores}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{] CPU Cores for [}\PY{l+s+si}{\PYZob{}}\PY{n}{stress\PYZus{}duration}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{] seconds}\PY{l+s+s2}{\PYZdq{}}\PY{p}{)}
\PY{n+nb}{print}\PY{p}{(}\PY{l+s+sa}{f}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Idling for }\PY{l+s+si}{\PYZob{}}\PY{n}{idle\PYZus{}duration}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{ seconds...}\PY{l+s+s2}{\PYZdq{}}\PY{p}{)}
\PY{n}{time}\PY{o}{.}\PY{n}{sleep}\PY{p}{(}\PY{n}{idle\PYZus{}duration}\PY{p}{)}
\PY{n+nb}{print}\PY{p}{(}\PY{l+s+sa}{f}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Starting the stress load on [}\PY{l+s+si}{\PYZob{}}\PY{n}{cores}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{] CPU Cores for [}\PY{l+s+si}{\PYZob{}}\PY{n}{stress\PYZus{}duration}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{] seconds}\PY{l+s+s2}{\PYZdq{}}\PY{p}{)}
\PY{n}{stress\PYZus{}cpu}\PY{p}{(}\PY{n}{num\PYZus{}cpus}\PY{o}{=}\PY{n}{cores}\PY{p}{,} \PY{n}{time}\PY{o}{=}\PY{n}{stress\PYZus{}duration}\PY{p}{)}
\PY{n+nb}{print}\PY{p}{(}\PY{l+s+sa}{f}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Idling for }\PY{l+s+si}{\PYZob{}}\PY{n}{idle\PYZus{}duration}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{ seconds...}\PY{l+s+s2}{\PYZdq{}}\PY{p}{)}
\PY{n}{time}\PY{o}{.}\PY{n}{sleep}\PY{p}{(}\PY{n}{idle\PYZus{}duration}\PY{p}{)}
\end{Verbatim}
\end{tcolorbox}
\hypertarget{helper-function-to-let-the-cpu-cool-down}{%
\subsection{Helper function to let the CPU cool
down}\label{helper-function-to-let-the-cpu-cool-down}}
This function is used to let the CPU cool down first to find a stable
baseline.
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{10}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{k}{def} \PY{n+nf}{cpu\PYZus{}cooldown}\PY{p}{(}\PY{n}{interval}\PY{o}{=}\PY{l+m+mi}{60}\PY{p}{,} \PY{n}{filename}\PY{o}{=}\PY{k+kc}{None}\PY{p}{)}\PY{p}{:}
\PY{l+s+sd}{\PYZdq{}\PYZdq{}\PYZdq{}Lets the CPU cool down until the temperature does not change anymore.\PYZdq{}\PYZdq{}\PYZdq{}}
\PY{n}{prev\PYZus{}tmp} \PY{o}{=} \PY{n}{get\PYZus{}cpu\PYZus{}temp}\PY{p}{(}\PY{p}{)}
\PY{k}{while} \PY{k+kc}{True}\PY{p}{:}
\PY{n}{time}\PY{o}{.}\PY{n}{sleep}\PY{p}{(}\PY{n}{interval}\PY{p}{)}
\PY{n}{tmp} \PY{o}{=} \PY{n}{get\PYZus{}cpu\PYZus{}temp}\PY{p}{(}\PY{p}{)}
\PY{n+nb}{print}\PY{p}{(}
\PY{l+s+sa}{f}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Current temperature: }\PY{l+s+si}{\PYZob{}}\PY{n}{tmp}\PY{l+s+si}{:}\PY{l+s+s2}{4.1f}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{°C \PYZhy{} }\PY{l+s+s2}{\PYZdq{}}
\PY{l+s+sa}{f}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Previous temperature: }\PY{l+s+si}{\PYZob{}}\PY{n}{prev\PYZus{}tmp}\PY{l+s+si}{:}\PY{l+s+s2}{4.1f}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{°C}\PY{l+s+s2}{\PYZdq{}}
\PY{p}{)}
\PY{k}{if} \PY{n+nb}{abs}\PY{p}{(}\PY{n}{tmp} \PY{o}{\PYZhy{}} \PY{n}{prev\PYZus{}tmp}\PY{p}{)} \PY{o}{\PYZlt{}} \PY{l+m+mf}{0.2}\PY{p}{:}
\PY{k}{break}
\PY{n}{prev\PYZus{}tmp} \PY{o}{=} \PY{n}{tmp}
\PY{k}{return} \PY{n}{tmp}
\end{Verbatim}
\end{tcolorbox}
\hypertarget{helper-function-for-handling-dataframes}{%
\subsection{Helper function for handling
dataframes}\label{helper-function-for-handling-dataframes}}
First, a dataframe is created and at the same time the column headers
are set. The function \texttt{dataframe\_add\_row()} is used to add the
measured values to the dataframe in the form of new rows.
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{11}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{c+c1}{\PYZsh{} Dataframe for the measuring values}
\PY{n}{df\PYZus{}meas\PYZus{}values} \PY{o}{=} \PY{n}{pd}\PY{o}{.}\PY{n}{DataFrame}\PY{p}{(}\PY{n}{columns}\PY{o}{=}\PY{p}{[}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{Time}\PY{l+s+s1}{\PYZsq{}}\PY{p}{,} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{CPU Temperature}\PY{l+s+s1}{\PYZsq{}}\PY{p}{,} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{CPU Frequency}\PY{l+s+s1}{\PYZsq{}}\PY{p}{,} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{Ambient Temperature}\PY{l+s+s1}{\PYZsq{}}\PY{p}{]}\PY{p}{)}
\end{Verbatim}
\end{tcolorbox}
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{12}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{k}{def} \PY{n+nf}{dataframe\PYZus{}add\PYZus{}row}\PY{p}{(}\PY{n}{df}\PY{o}{=}\PY{k+kc}{None}\PY{p}{,} \PY{n}{row}\PY{o}{=}\PY{p}{[}\PY{p}{]}\PY{p}{)}\PY{p}{:}
\PY{k}{if} \PY{p}{(}\PY{n}{df} \PY{o+ow}{is} \PY{k+kc}{None}\PY{p}{)}\PY{p}{:}
\PY{k}{return}
\PY{c+c1}{\PYZsh{} Add a row}
\PY{n}{df}\PY{o}{.}\PY{n}{loc}\PY{p}{[}\PY{o}{\PYZhy{}}\PY{l+m+mi}{1}\PY{p}{]} \PY{o}{=} \PY{n}{row}
\PY{c+c1}{\PYZsh{} Shift the index}
\PY{n}{df}\PY{o}{.}\PY{n}{index} \PY{o}{=} \PY{n}{df}\PY{o}{.}\PY{n}{index} \PY{o}{+} \PY{l+m+mi}{1}
\PY{c+c1}{\PYZsh{} Reset the index of dataframe and avoid the old index being added as a column}
\PY{n}{df}\PY{o}{.}\PY{n}{reset\PYZus{}index}\PY{p}{(}\PY{n}{drop}\PY{o}{=}\PY{k+kc}{True}\PY{p}{,} \PY{n}{inplace}\PY{o}{=}\PY{k+kc}{True}\PY{p}{)}
\end{Verbatim}
\end{tcolorbox}
\hypertarget{main-worker-function}{%
\subsection{Main worker function}\label{main-worker-function}}
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{13}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{c+c1}{\PYZsh{} Function for running the stress test in another thread while measuring CPU temperature and frequency}
\PY{c+c1}{\PYZsh{} Found here: https://github.com/nschloe/stressberry/blob/main/stressberry/cli/run.py}
\PY{k}{def} \PY{n+nf}{run}\PY{p}{(}\PY{n}{argv}\PY{o}{=}\PY{k+kc}{None}\PY{p}{)}\PY{p}{:}
\PY{c+c1}{\PYZsh{} Cool down first}
\PY{n+nb}{print}\PY{p}{(}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Awaiting stable baseline temperature ...}\PY{l+s+s2}{\PYZdq{}}\PY{p}{)}
\PY{n}{cpu\PYZus{}cooldown}\PY{p}{(}\PY{n}{interval}\PY{o}{=}\PY{l+m+mi}{60}\PY{p}{)}
\PY{c+c1}{\PYZsh{} Start the stress test in another thread}
\PY{n}{t} \PY{o}{=} \PY{n}{threading}\PY{o}{.}\PY{n}{Thread}\PY{p}{(}
\PY{n}{target}\PY{o}{=}\PY{k}{lambda}\PY{p}{:} \PY{n}{run\PYZus{}stress}\PY{p}{(}\PY{n}{stress\PYZus{}duration}\PY{o}{=}\PY{l+m+mi}{900}\PY{p}{,} \PY{n}{idle\PYZus{}duration}\PY{o}{=}\PY{l+m+mi}{300}\PY{p}{,} \PY{n}{cores}\PY{o}{=}\PY{l+m+mi}{4}\PY{p}{)}\PY{p}{,} \PY{n}{args}\PY{o}{=}\PY{p}{(}\PY{p}{)}
\PY{p}{)}
\PY{c+c1}{\PYZsh{} Init event handler for killing the thread}
\PY{n}{t}\PY{o}{.}\PY{n}{event} \PY{o}{=} \PY{n}{threading}\PY{o}{.}\PY{n}{Event}\PY{p}{(}\PY{p}{)}
\PY{c+c1}{\PYZsh{} Start the thread}
\PY{n}{t}\PY{o}{.}\PY{n}{start}\PY{p}{(}\PY{p}{)}
\PY{c+c1}{\PYZsh{} Init row array}
\PY{n}{values\PYZus{}row} \PY{o}{=} \PY{p}{[}\PY{p}{]}
\PY{c+c1}{\PYZsh{} Get starting time}
\PY{n}{start\PYZus{}time} \PY{o}{=} \PY{n}{time}\PY{o}{.}\PY{n}{time}\PY{p}{(}\PY{p}{)}
\PY{k}{while} \PY{n}{t}\PY{o}{.}\PY{n}{is\PYZus{}alive}\PY{p}{(}\PY{p}{)}\PY{p}{:}
\PY{k}{try}\PY{p}{:}
\PY{c+c1}{\PYZsh{} Get time relative to starting time and round to 1 decimal}
\PY{n}{timestamp} \PY{o}{=} \PY{n+nb}{float}\PY{p}{(}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+si}{\PYZob{}:.1f\PYZcb{}}\PY{l+s+s2}{\PYZdq{}}\PY{o}{.}\PY{n}{format}\PY{p}{(}\PY{n}{time}\PY{o}{.}\PY{n}{time}\PY{p}{(}\PY{p}{)} \PY{o}{\PYZhy{}} \PY{n}{start\PYZus{}time}\PY{p}{)}\PY{p}{)}
\PY{c+c1}{\PYZsh{} Get CPU temperature and round to 1 decimal}
\PY{n}{temperature\PYZus{}cpu} \PY{o}{=} \PY{n+nb}{float}\PY{p}{(}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+si}{\PYZob{}:.1f\PYZcb{}}\PY{l+s+s2}{\PYZdq{}}\PY{o}{.}\PY{n}{format}\PY{p}{(}\PY{n}{get\PYZus{}cpu\PYZus{}temp}\PY{p}{(}\PY{p}{)}\PY{p}{)}\PY{p}{)}
\PY{c+c1}{\PYZsh{} Get ambient temperature and round to 1 decimal}
\PY{n}{temperature\PYZus{}ambient} \PY{o}{=} \PY{n+nb}{float}\PY{p}{(}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+si}{\PYZob{}:.1f\PYZcb{}}\PY{l+s+s2}{\PYZdq{}}\PY{o}{.}\PY{n}{format}\PY{p}{(}\PY{n}{get\PYZus{}ambient\PYZus{}temp}\PY{p}{(}\PY{p}{)}\PY{p}{)}\PY{p}{)}
\PY{c+c1}{\PYZsh{} Get CPU frequency and round to 1 decimal}
\PY{n}{frequency} \PY{o}{=} \PY{n+nb}{float}\PY{p}{(}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+si}{\PYZob{}:.1f\PYZcb{}}\PY{l+s+s2}{\PYZdq{}}\PY{o}{.}\PY{n}{format}\PY{p}{(}\PY{n}{get\PYZus{}cpu\PYZus{}freq}\PY{p}{(}\PY{p}{)}\PY{p}{)}\PY{p}{)}
\PY{n}{values\PYZus{}row} \PY{o}{=} \PY{p}{[} \PY{n}{timestamp}\PY{p}{,}
\PY{n}{temperature\PYZus{}cpu}\PY{p}{,}
\PY{n}{frequency}\PY{p}{,}
\PY{n}{temperature\PYZus{}ambient}
\PY{p}{]}
\PY{n}{dataframe\PYZus{}add\PYZus{}row}\PY{p}{(}\PY{n}{df\PYZus{}meas\PYZus{}values}\PY{p}{,} \PY{n}{values\PYZus{}row}\PY{p}{)}
\PY{n+nb}{print}\PY{p}{(}
\PY{l+s+sa}{f}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Time: }\PY{l+s+si}{\PYZob{}}\PY{n}{timestamp}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{ s,}\PY{l+s+se}{\PYZbs{}t}\PY{l+s+s2}{\PYZdq{}}
\PY{l+s+sa}{f}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{CPU Temperature: }\PY{l+s+si}{\PYZob{}}\PY{n}{temperature\PYZus{}cpu}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{ °C,}\PY{l+s+se}{\PYZbs{}t}\PY{l+s+s2}{\PYZdq{}}
\PY{l+s+sa}{f}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Ambient Temperature: }\PY{l+s+si}{\PYZob{}}\PY{n}{temperature\PYZus{}ambient}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{ °C,}\PY{l+s+se}{\PYZbs{}t}\PY{l+s+s2}{\PYZdq{}}
\PY{l+s+sa}{f}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Frequency: }\PY{l+s+si}{\PYZob{}}\PY{n}{frequency}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s2}{ MHz}\PY{l+s+s2}{\PYZdq{}}
\PY{p}{)}
\PY{c+c1}{\PYZsh{} Choose the sample interval such that we have a respectable number of data points}
\PY{n}{t}\PY{o}{.}\PY{n}{join}\PY{p}{(}\PY{l+m+mf}{2.0}\PY{p}{)}
\PY{k}{except}\PY{p}{:}
\PY{n+nb}{print}\PY{p}{(}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Keyboard Interrupt \PYZca{}C detected.}\PY{l+s+s2}{\PYZdq{}}\PY{p}{)}
\PY{n+nb}{print}\PY{p}{(}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Bye.}\PY{l+s+s2}{\PYZdq{}}\PY{p}{)}
\PY{c+c1}{\PYZsh{} Stop the thread by calling the event}
\PY{n}{t}\PY{o}{.}\PY{n}{event}\PY{o}{.}\PY{n}{set}\PY{p}{(}\PY{p}{)}
\PY{k}{break}
\PY{c+c1}{\PYZsh{} Normalize times so we are starting at \PYZsq{}0 s\PYZsq{}}
\PY{c+c1}{\PYZsh{}time0 = df\PYZus{}meas\PYZus{}values[\PYZsq{}Time\PYZsq{}][0]}
\PY{c+c1}{\PYZsh{} It\PYZsq{}s a really fancy oneliner \PYZhy{} but not necessary at all ...}
\PY{c+c1}{\PYZsh{}df\PYZus{}meas\PYZus{}values[\PYZsq{}Time\PYZsq{}] = [tm \PYZhy{} time0 for tm in df\PYZus{}meas\PYZus{}values[\PYZsq{}Time\PYZsq{}]]}
\end{Verbatim}
\end{tcolorbox}
\hypertarget{run-the-heating-test}{%
\section{Run the heating test}\label{run-the-heating-test}}
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{ }{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{c+c1}{\PYZsh{} Clear all data in dataframe}
\PY{n}{df\PYZus{}meas\PYZus{}values} \PY{o}{=} \PY{n}{df\PYZus{}meas\PYZus{}values}\PY{o}{.}\PY{n}{iloc}\PY{p}{[}\PY{l+m+mi}{0}\PY{p}{:}\PY{l+m+mi}{0}\PY{p}{]}
\PY{n}{run}\PY{p}{(}\PY{p}{)}
\end{Verbatim}
\end{tcolorbox}
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{25}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{n}{display}\PY{p}{(}\PY{n}{df\PYZus{}meas\PYZus{}values}\PY{p}{)}
\end{Verbatim}
\end{tcolorbox}
\begin{verbatim}
Time CPU Temperature CPU Frequency Ambient Temperature
0 0.0 45.7 900.2 24.6
1 2.1 45.7 700.2 24.6
2 4.3 46.2 900.2 24.5
3 6.4 45.2 800.2 24.5
4 8.5 45.7 800.2 24.6
.. ... ... ... ...
692 1491.6 51.1 1500.4 24.6
693 1493.7 49.6 1000.2 24.7
694 1495.8 48.7 800.2 24.6
695 1498.0 50.1 1000.3 24.6
696 1500.1 49.6 900.2 24.6
[697 rows x 4 columns]
\end{verbatim}
\hypertarget{save-all-to-csv-files}{%
\section{Save all to CSV files}\label{save-all-to-csv-files}}
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{26}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{c+c1}{\PYZsh{} Write dataframe to CSV file}
\PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{=} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{RaspiB4JupyterLab\PYZus{}stress\PYZus{}measurement}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b3plus} \PY{o}{=} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{RaspiB3plusEPaper\PYZus{}stress\PYZus{}measurement}\PY{l+s+s1}{\PYZsq{}}
\PY{c+c1}{\PYZsh{}df\PYZus{}meas\PYZus{}values.to\PYZus{}csv(r\PYZsq{}./data\PYZus{}files/\PYZsq{} + str\PYZus{}file\PYZus{}prefix\PYZus{}b4 + \PYZsq{}\PYZus{}PlasticCase\PYZus{}woHeatSinks.csv\PYZsq{}, sep =\PYZsq{}\PYZbs{}t\PYZsq{}, index = False, header=True)}
\PY{c+c1}{\PYZsh{}df\PYZus{}meas\PYZus{}values.to\PYZus{}csv(r\PYZsq{}./data\PYZus{}files/\PYZsq{} + str\PYZus{}file\PYZus{}prefix\PYZus{}b4 + \PYZsq{}\PYZus{}PlasticCase\PYZus{}wHeatSinks.csv\PYZsq{}, sep =\PYZsq{}\PYZbs{}t\PYZsq{}, index = False, header=True)}
\PY{c+c1}{\PYZsh{}df\PYZus{}meas\PYZus{}values.to\PYZus{}csv(r\PYZsq{}./data\PYZus{}files/\PYZsq{} + str\PYZus{}file\PYZus{}prefix\PYZus{}b4 + \PYZsq{}\PYZus{}PlasticCase\PYZus{}wHeatSinksAndFan5V.csv\PYZsq{}, sep =\PYZsq{}\PYZbs{}t\PYZsq{}, index = False, header=True)}
\PY{c+c1}{\PYZsh{}df\PYZus{}meas\PYZus{}values.to\PYZus{}csv(r\PYZsq{}./data\PYZus{}files/\PYZsq{} + str\PYZus{}file\PYZus{}prefix\PYZus{}b4 + \PYZsq{}\PYZus{}PlasticCase\PYZus{}wHeatSinksAndFan3V.csv\PYZsq{}, sep =\PYZsq{}\PYZbs{}t\PYZsq{}, index = False, header=True)}
\PY{c+c1}{\PYZsh{}df\PYZus{}meas\PYZus{}values.to\PYZus{}csv(r\PYZsq{}./data\PYZus{}files/\PYZsq{} + str\PYZus{}file\PYZus{}prefix\PYZus{}b4 + \PYZsq{}\PYZus{}PlasticCase\PYZus{}wHeatSinksAndFan5Vrev.csv\PYZsq{}, sep =\PYZsq{}\PYZbs{}t\PYZsq{}, index = False, header=True)}
\PY{c+c1}{\PYZsh{}df\PYZus{}meas\PYZus{}values.to\PYZus{}csv(r\PYZsq{}./data\PYZus{}files/\PYZsq{} + str\PYZus{}file\PYZus{}prefix\PYZus{}b4 + \PYZsq{}\PYZus{}pinkRaspiCase\PYZus{}wHeatSinks.csv\PYZsq{}, sep =\PYZsq{}\PYZbs{}t\PYZsq{}, index = False, header=True)}
\PY{c+c1}{\PYZsh{}df\PYZus{}meas\PYZus{}values.to\PYZus{}csv(r\PYZsq{}./data\PYZus{}files/\PYZsq{} + str\PYZus{}file\PYZus{}prefix\PYZus{}b4 + \PYZsq{}\PYZus{}PlasticCase\PYZus{}wHeatSinksAndNoctuaFan5V.csv\PYZsq{}, sep =\PYZsq{}\PYZbs{}t\PYZsq{}, index = False, header=True)}
\PY{c+c1}{\PYZsh{}df\PYZus{}meas\PYZus{}values.to\PYZus{}csv(r\PYZsq{}./data\PYZus{}files/\PYZsq{} + str\PYZus{}file\PYZus{}prefix\PYZus{}b4 + \PYZsq{}\PYZus{}PlasticCase\PYZus{}wHeatSinksAndNoctuaFan3V.csv\PYZsq{}, sep =\PYZsq{}\PYZbs{}t\PYZsq{}, index = False, header=True)}
\PY{c+c1}{\PYZsh{}df\PYZus{}meas\PYZus{}values.to\PYZus{}csv(r\PYZsq{}./data\PYZus{}files/\PYZsq{} + str\PYZus{}file\PYZus{}prefix\PYZus{}b4 + \PYZsq{}\PYZus{}PlasticCase\PYZus{}wHeatSinksAndNoctuaFan5Vrev.csv\PYZsq{}, sep =\PYZsq{}\PYZbs{}t\PYZsq{}, index = False, header=True)}
\PY{c+c1}{\PYZsh{}df\PYZus{}meas\PYZus{}values.to\PYZus{}csv(r\PYZsq{}./data\PYZus{}files/\PYZsq{} + str\PYZus{}file\PYZus{}prefix\PYZus{}b4 + \PYZsq{}\PYZus{}woCase\PYZus{}wHeatSinksAndCtrlFan5V\PYZus{}70C.csv\PYZsq{}, sep =\PYZsq{}\PYZbs{}t\PYZsq{}, index = False, header=True)}
\PY{n}{df\PYZus{}meas\PYZus{}values}\PY{o}{.}\PY{n}{to\PYZus{}csv}\PY{p}{(}\PY{l+s+sa}{r}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{./data\PYZus{}files/}\PY{l+s+s1}{\PYZsq{}} \PY{o}{+} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}woCase\PYZus{}wHeatSinksAndCtrlFan5V\PYZus{}65C.csv}\PY{l+s+s1}{\PYZsq{}}\PY{p}{,} \PY{n}{sep} \PY{o}{=}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+se}{\PYZbs{}t}\PY{l+s+s1}{\PYZsq{}}\PY{p}{,} \PY{n}{index} \PY{o}{=} \PY{k+kc}{False}\PY{p}{,} \PY{n}{header}\PY{o}{=}\PY{k+kc}{True}\PY{p}{)}
\PY{c+c1}{\PYZsh{}df\PYZus{}meas\PYZus{}values.to\PYZus{}csv(r\PYZsq{}./data\PYZus{}files/\PYZsq{} + str\PYZus{}file\PYZus{}prefix\PYZus{}b3plus + \PYZsq{}\PYZus{}PlasticCase\PYZus{}wHeatSinks.csv\PYZsq{}, sep =\PYZsq{}\PYZbs{}t\PYZsq{}, index = False, header=True)}
\end{Verbatim}
\end{tcolorbox}
\hypertarget{read-in-the-csv-files-and-display-it}{%
\section{Read in the CSV files and display
it}\label{read-in-the-csv-files-and-display-it}}
\hypertarget{read-in-the-csv-files-in-dataframes}{%
\subsection{Read in the CSV files in
dataframes}\label{read-in-the-csv-files-in-dataframes}}
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{2}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{c+c1}{\PYZsh{} Helper function for creating dataframes from CSV files}
\PY{k}{def} \PY{n+nf}{create\PYZus{}dictionary\PYZus{}from\PYZus{}csv}\PY{p}{(}\PY{n}{filename}\PY{p}{,} \PY{n}{offset}\PY{o}{=}\PY{l+m+mi}{0}\PY{p}{,} \PY{n}{cols\PYZus{}wanted}\PY{o}{=}\PY{l+m+mi}{1}\PY{p}{)}\PY{p}{:}
\PY{n}{my\PYZus{}dataframe} \PY{o}{=} \PY{n}{pd}\PY{o}{.}\PY{n}{read\PYZus{}csv}\PY{p}{(}\PY{n}{filename}\PY{p}{,} \PY{n}{sep}\PY{o}{=}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+se}{\PYZbs{}t}\PY{l+s+s1}{\PYZsq{}}\PY{p}{,} \PY{n}{index\PYZus{}col}\PY{o}{=}\PY{k+kc}{False}\PY{p}{,} \PY{n}{decimal}\PY{o}{=}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{.}\PY{l+s+s1}{\PYZsq{}}\PY{p}{,} \PY{n}{header}\PY{o}{=}\PY{n}{offset}\PY{p}{)}
\PY{c+c1}{\PYZsh{} Delete all cloumns after the desired ones}
\PY{n}{my\PYZus{}dataframe}\PY{o}{.}\PY{n}{drop}\PY{p}{(}\PY{n}{my\PYZus{}dataframe}\PY{o}{.}\PY{n}{columns}\PY{p}{[}\PY{n}{cols\PYZus{}wanted}\PY{p}{:}\PY{p}{]}\PY{p}{,} \PY{n}{axis}\PY{o}{=}\PY{l+m+mi}{1}\PY{p}{,} \PY{n}{inplace}\PY{o}{=}\PY{k+kc}{True}\PY{p}{)}
\PY{k}{return} \PY{n}{my\PYZus{}dataframe}
\end{Verbatim}
\end{tcolorbox}
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{3}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{=} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{RaspiB4JupyterLab\PYZus{}stress\PYZus{}measurement}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b3plus} \PY{o}{=} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{RaspiB3plusEPaper\PYZus{}stress\PYZus{}measurement}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}1} \PY{o}{=} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}PlasticCase\PYZus{}woHeatSinks.csv}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}2} \PY{o}{=} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}PlasticCase\PYZus{}wHeatSinks.csv}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}3} \PY{o}{=} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}PlasticCase\PYZus{}wHeatSinksAndFan5V.csv}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}4} \PY{o}{=} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}PlasticCase\PYZus{}wHeatSinksAndFan3V.csv}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}5} \PY{o}{=} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}PlasticCase\PYZus{}wHeatSinksAndFan5Vrev.csv}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}6} \PY{o}{=} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}pinkRaspiCase\PYZus{}wHeatSinks.csv}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}7} \PY{o}{=} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}PlasticCase\PYZus{}wHeatSinksAndNoctuaFan5V.csv}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}8} \PY{o}{=} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}PlasticCase\PYZus{}wHeatSinksAndNoctuaFan3V.csv}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}11} \PY{o}{=} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}PlasticCase\PYZus{}wHeatSinksAndNoctuaFan5Vrev.csv}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}10} \PY{o}{=} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}woCase\PYZus{}wHeatSinksAndCtrlFan5V\PYZus{}70C.csv}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}12} \PY{o}{=} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b4} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}woCase\PYZus{}wHeatSinksAndCtrlFan5V\PYZus{}65C.csv}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}9} \PY{o}{=} \PY{n}{str\PYZus{}file\PYZus{}prefix\PYZus{}b3plus} \PY{o}{+} \PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{\PYZus{}PlasticCase\PYZus{}wHeatSinks.csv}\PY{l+s+s1}{\PYZsq{}}
\PY{n}{df\PYZus{}1\PYZus{}PC\PYZus{}woHeatSinks} \PY{o}{=} \PY{n}{create\PYZus{}dictionary\PYZus{}from\PYZus{}csv}\PY{p}{(}\PY{n}{filename}\PY{o}{=}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{./data\PYZus{}files/}\PY{l+s+s2}{\PYZdq{}} \PY{o}{+} \PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}1}\PY{p}{,} \PY{n}{offset}\PY{o}{=}\PY{l+m+mi}{0}\PY{p}{,} \PY{n}{cols\PYZus{}wanted}\PY{o}{=}\PY{l+m+mi}{4}\PY{p}{)}
\PY{n}{df\PYZus{}2\PYZus{}PC\PYZus{}wHeatSinks} \PY{o}{=} \PY{n}{create\PYZus{}dictionary\PYZus{}from\PYZus{}csv}\PY{p}{(}\PY{n}{filename}\PY{o}{=}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{./data\PYZus{}files/}\PY{l+s+s2}{\PYZdq{}} \PY{o}{+} \PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}2}\PY{p}{,} \PY{n}{offset}\PY{o}{=}\PY{l+m+mi}{0}\PY{p}{,} \PY{n}{cols\PYZus{}wanted}\PY{o}{=}\PY{l+m+mi}{4}\PY{p}{)}
\PY{n}{df\PYZus{}3\PYZus{}PC\PYZus{}wHeatSinksAndFan5V} \PY{o}{=} \PY{n}{create\PYZus{}dictionary\PYZus{}from\PYZus{}csv}\PY{p}{(}\PY{n}{filename}\PY{o}{=}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{./data\PYZus{}files/}\PY{l+s+s2}{\PYZdq{}} \PY{o}{+} \PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}3}\PY{p}{,} \PY{n}{offset}\PY{o}{=}\PY{l+m+mi}{0}\PY{p}{,} \PY{n}{cols\PYZus{}wanted}\PY{o}{=}\PY{l+m+mi}{4}\PY{p}{)}
\PY{n}{df\PYZus{}4\PYZus{}PC\PYZus{}wHeatSinksAndFan3V} \PY{o}{=} \PY{n}{create\PYZus{}dictionary\PYZus{}from\PYZus{}csv}\PY{p}{(}\PY{n}{filename}\PY{o}{=}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{./data\PYZus{}files/}\PY{l+s+s2}{\PYZdq{}} \PY{o}{+} \PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}4}\PY{p}{,} \PY{n}{offset}\PY{o}{=}\PY{l+m+mi}{0}\PY{p}{,} \PY{n}{cols\PYZus{}wanted}\PY{o}{=}\PY{l+m+mi}{4}\PY{p}{)}
\PY{n}{df\PYZus{}5\PYZus{}PC\PYZus{}wHeatSinksAndFan5Vrev} \PY{o}{=} \PY{n}{create\PYZus{}dictionary\PYZus{}from\PYZus{}csv}\PY{p}{(}\PY{n}{filename}\PY{o}{=}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{./data\PYZus{}files/}\PY{l+s+s2}{\PYZdq{}} \PY{o}{+} \PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}5}\PY{p}{,} \PY{n}{offset}\PY{o}{=}\PY{l+m+mi}{0}\PY{p}{,} \PY{n}{cols\PYZus{}wanted}\PY{o}{=}\PY{l+m+mi}{4}\PY{p}{)}
\PY{n}{df\PYZus{}6\PYZus{}RC\PYZus{}wHeatSinks} \PY{o}{=} \PY{n}{create\PYZus{}dictionary\PYZus{}from\PYZus{}csv}\PY{p}{(}\PY{n}{filename}\PY{o}{=}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{./data\PYZus{}files/}\PY{l+s+s2}{\PYZdq{}} \PY{o}{+} \PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}6}\PY{p}{,} \PY{n}{offset}\PY{o}{=}\PY{l+m+mi}{0}\PY{p}{,} \PY{n}{cols\PYZus{}wanted}\PY{o}{=}\PY{l+m+mi}{4}\PY{p}{)}
\PY{n}{df\PYZus{}7\PYZus{}PC\PYZus{}wHeatSinksAndNoctuaFan5V} \PY{o}{=} \PY{n}{create\PYZus{}dictionary\PYZus{}from\PYZus{}csv}\PY{p}{(}\PY{n}{filename}\PY{o}{=}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{./data\PYZus{}files/}\PY{l+s+s2}{\PYZdq{}} \PY{o}{+} \PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}7}\PY{p}{,} \PY{n}{offset}\PY{o}{=}\PY{l+m+mi}{0}\PY{p}{,} \PY{n}{cols\PYZus{}wanted}\PY{o}{=}\PY{l+m+mi}{4}\PY{p}{)}
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\PY{n}{df\PYZus{}9\PYZus{}PC\PYZus{}wHeatSinks} \PY{o}{=} \PY{n}{create\PYZus{}dictionary\PYZus{}from\PYZus{}csv}\PY{p}{(}\PY{n}{filename}\PY{o}{=}\PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{./data\PYZus{}files/}\PY{l+s+s2}{\PYZdq{}} \PY{o}{+} \PY{n}{str\PYZus{}file\PYZus{}name\PYZus{}9}\PY{p}{,} \PY{n}{offset}\PY{o}{=}\PY{l+m+mi}{0}\PY{p}{,} \PY{n}{cols\PYZus{}wanted}\PY{o}{=}\PY{l+m+mi}{4}\PY{p}{)}
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Time CPU Temperature CPU Frequency Ambient Temperature
0 0.0 47.8 800.0 23.2
1 2.2 47.8 800.0 23.2
2 4.3 47.8 800.0 23.2
3 6.5 48.3 1400.0 23.2
4 8.6 47.8 800.0 23.2