finished the LaTeX script
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# *.pdf
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## Generated if empty string is given at "Please type another file name for output:"
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.pdf
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*.pdf
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## Bibliography auxiliary files (bibtex/biblatex/biber):
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*.bbl
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90
LaTeX/Homework_Lesson_10.tex
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90
LaTeX/Homework_Lesson_10.tex
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\documentclass[a4paper, 12pt, english]{article}
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\usepackage[utf8]{inputenc}
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\usepackage[T1]{fontenc}
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\usepackage{listings}
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\usepackage{xcolor}
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\usepackage{hyperref}
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\usepackage{multicol}
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\usepackage{setspace}
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\usepackage{graphicx}
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\title{Advanced Operating Systems\\Assignment Week 10}
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\author{Paul Lödige \\ Student ID: 37-229753}
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\makeatletter
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\newcommand*{\toccontents}{\@starttoc{toc}}
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\makeatother
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\begin{document}
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\maketitle
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\toccontents
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\section{Assignment}%
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\label{sec:Assignment}
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Create a user-space program (any language is acceptable)
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that differentiates the performance of the Linux Kernel with the PREEMPT\_ RT patches from that without the PREEMPT\_ RT patches.
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Compile and run the program.
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Submit the source code and the screen shots of the standard output and the kernel log message, respectively, when the program is being executed.
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\clearpage
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\section{Code}%
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\label{sec:Code}
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\definecolor{mGreen}{rgb}{0,0.6,0}
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\definecolor{mGray}{rgb}{0.5,0.5,0.5}
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\definecolor{mPurple}{rgb}{0.58,0,0.82}
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\definecolor{backgroundColour}{rgb}{0.95,0.95,0.92}
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\lstset{
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language=bash,
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backgroundcolor=\color{backgroundColour},
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commentstyle=\color{mGreen},
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keywordstyle=\color{magenta},
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numberstyle=\tiny\color{mGray},
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stringstyle=\color{mPurple},
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basicstyle=\ttfamily\scriptsize,
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breakatwhitespace=false,
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breaklines=true,
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captionpos=b,
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keepspaces=true,
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numbers=left,
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firstnumber=0,
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stepnumber=1,
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numbersep=5pt,
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showspaces=false,
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showstringspaces=false,
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showtabs=false,
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tabsize=2,
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literate={~}{{$\mathtt{\sim}$}}1
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}
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\lstset{literate=%
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{Ö}{{\"O}}1
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{Ä}{{\"A}}1
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{Ü}{{\"U}}1
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{ß}{{\ss}}2
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{ü}{{\"u}}1
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{ä}{{\"a}}1
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{ö}{{\"o}}1
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}
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The following code is just a shell script that makes use of two programs provided by the \texttt{rt-tests} package (Arch Linux).
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It uses the \texttt{hackbench} program to put stress on the system and then evaluates the maximum latency with the \texttt{cyclictest} program.
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This provides a much more reliable method of testing the real-time capabilites of the system than any self-developed code I was able to come up with.
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\lstinputlisting{../test.sh}
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The code is based on the following two sources:\\
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\url{https://wiki.archlinux.org/title/Realtime_kernel_patchset}\\
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\url{https://shuhaowu.com/blog/2022/02-linux-rt-appdev-part2.html}
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\section{Output}%
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\label{sec:Output}
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\subsection{with PREEMPT\_RT}%
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\label{sub:with PREEMPT RT}
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\includegraphics[width = \textwidth]{with_rt.png}
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\subsection{without PREEMPT\_RT}%
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\label{sub:without PREEMPT RT}
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\includegraphics[width = \textwidth]{without_rt.png}
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\end{document}
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BIN
LaTeX/with_rt.png
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BIN
LaTeX/with_rt.png
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Binary file not shown.
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After Width: | Height: | Size: 46 KiB |
BIN
LaTeX/without_rt.png
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BIN
LaTeX/without_rt.png
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Binary file not shown.
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After Width: | Height: | Size: 46 KiB |
65
output.txt
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output.txt
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==================================================
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Linux advancedoperatingsystemsvm 6.0.5-2-rt14-MANJARO #1 SMP PREEMPT_RT Sun Nov 6 15:25:56 CET 2022 x86_64 GNU/Linux
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--------------------------------------------------
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Running in process mode with 10 groups using 40 file descriptors each (== 400 tasks)
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Each sender will pass 20000 messages of 100 bytes
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--------------------------------------------------
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# /dev/cpu_dma_latency set to 0us
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T: 0 (18229) P:80 I:200 C: 298471 Min: 3 Act: 66 Avg: 44 Max: 1060
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T: 1 (18230) P:80 I:200 C: 298210 Min: 3 Act: 15 Avg: 29 Max: 1078
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T: 2 (18231) P:80 I:200 C: 298354 Min: 3 Act: 28 Avg: 29 Max: 1051
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T: 3 (18232) P:80 I:200 C: 298247 Min: 3 Act: 43 Avg: 29 Max: 1046
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--------------------------------------------------
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Time: 77.677
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==================================================
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Linux advancedoperatingsystemsvm 6.0.11-1-MANJARO #1 SMP PREEMPT_DYNAMIC Fri Dec 2 21:23:52 UTC 2022 x86_64 GNU/Linux
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--------------------------------------------------
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Running in process mode with 10 groups using 40 file descriptors each (== 400 tasks)
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Each sender will pass 20000 messages of 100 bytes
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--------------------------------------------------
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Time: 42.581
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# /dev/cpu_dma_latency set to 0us
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T: 0 ( 2830) P:80 I:200 C: 297326 Min: 2 Act: 127 Avg: 38 Max: 2452
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T: 1 ( 2831) P:80 I:200 C: 297489 Min: 1 Act: 34 Avg: 52 Max: 2376
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T: 2 ( 2832) P:80 I:200 C: 297665 Min: 2 Act: 29 Avg: 33 Max: 2446
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T: 3 ( 2833) P:80 I:200 C: 297447 Min: 2 Act: 10 Avg: 32 Max: 2350
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--------------------------------------------------
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==================================================
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Linux advancedoperatingsystemsvm 6.0.11-1-MANJARO #1 SMP PREEMPT_DYNAMIC Fri Dec 2 21:23:52 UTC 2022 x86_64 GNU/Linux
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--------------------------------------------------
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Running in process mode with 10 groups using 40 file descriptors each (== 400 tasks)
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Each sender will pass 30000 messages of 100 bytes
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--------------------------------------------------
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Time: 54.930
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# /dev/cpu_dma_latency set to 0us
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T: 0 ( 6073) P:80 I:200 C: 297385 Min: 2 Act: 30 Avg: 30 Max: 1762
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T: 1 ( 6076) P:80 I:200 C: 297132 Min: 2 Act: 37 Avg: 34 Max: 1790
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T: 2 ( 6078) P:80 I:200 C: 296288 Min: 2 Act: 22 Avg: 27 Max: 1759
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T: 3 ( 6082) P:80 I:200 C: 297397 Min: 2 Act: 20 Avg: 50 Max: 1742
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--------------------------------------------------
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==================================================
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Linux advancedoperatingsystemsvm 6.0.11-1-MANJARO #1 SMP PREEMPT_DYNAMIC Fri Dec 2 21:23:52 UTC 2022 x86_64 GNU/Linux
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--------------------------------------------------
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Running in process mode with 10 groups using 40 file descriptors each (== 400 tasks)
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Each sender will pass 40000 messages of 100 bytes
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--------------------------------------------------
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# /dev/cpu_dma_latency set to 0us
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T: 0 ( 2846) P:80 I:200 C: 297642 Min: 3 Act: 8 Avg: 41 Max: 34750
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T: 1 ( 2847) P:80 I:200 C: 297348 Min: 3 Act: 17 Avg: 35 Max: 34712
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T: 2 ( 2848) P:80 I:200 C: 297864 Min: 3 Act: 58 Avg: 60 Max: 34786
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T: 3 ( 2849) P:80 I:200 C: 298013 Min: 3 Act: 50 Avg: 35 Max: 34711
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--------------------------------------------------
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Time: 89.334
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==================================================
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Linux advancedoperatingsystemsvm 6.0.5-2-rt14-MANJARO #1 SMP PREEMPT_RT Sun Nov 6 15:25:56 CET 2022 x86_64 GNU/Linux
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--------------------------------------------------
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Running in process mode with 10 groups using 40 file descriptors each (== 400 tasks)
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Each sender will pass 40000 messages of 100 bytes
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--------------------------------------------------
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# /dev/cpu_dma_latency set to 0us
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T: 0 ( 2872) P:80 I:200 C: 297927 Min: 2 Act: 51 Avg: 37 Max: 1756
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T: 1 ( 2873) P:80 I:200 C: 297834 Min: 2 Act: 29 Avg: 37 Max: 1726
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T: 2 ( 2874) P:80 I:200 C: 297550 Min: 3 Act: 31 Avg: 47 Max: 1815
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T: 3 ( 2875) P:80 I:200 C: 297519 Min: 3 Act: 34 Avg: 30 Max: 1743
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--------------------------------------------------
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Time: 153.851
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3
test.sh
3
test.sh
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#!/bin/bash
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echo "==================================================" >> output.txt
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uname -a >> output.txt
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echo "--------------------------------------------------" >> output.txt
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hackbench -l 20000 >> output.txt &
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hackbench -l 40000 >> output.txt &
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sleep 1
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echo "--------------------------------------------------" >> output.txt
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sudo cyclictest -q --mlockall --smp --priority=80 --interval=200 --distance=0 -D 1m >> output.txt
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