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feat: lab4 final report
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{/usr/share/texmf/fonts/enc/dvips/cm-super/cm-super-ts1.enc}</usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmbx10.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmbx12.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmmi10.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmr10.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmr12.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmr17.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmsy10.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmti10.pfb></usr/share/texmf/fonts/type1/public/cm-super/sfti1000.pfb>
|
||||
Output written on report.pdf (1 page, 96710 bytes).
|
||||
Output written on report.pdf (15 pages, 205194 bytes).
|
||||
PDF statistics:
|
||||
85 PDF objects out of 1000 (max. 8388607)
|
||||
72 compressed objects within 1 object stream
|
||||
24 named destinations out of 1000 (max. 500000)
|
||||
17 words of extra memory for PDF output out of 10000 (max. 10000000)
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380 PDF objects out of 1000 (max. 8388607)
|
||||
336 compressed objects within 4 object streams
|
||||
196 named destinations out of 1000 (max. 500000)
|
||||
100 words of extra memory for PDF output out of 10000 (max. 10000000)
|
||||
|
||||
|
||||
@ -1,2 +1,8 @@
|
||||
\BOOKMARK [1][-]{section.1}{Introduction}{}% 1
|
||||
\BOOKMARK [1][-]{section.2}{Finishing comments}{}% 2
|
||||
\BOOKMARK [2][-]{subsection.1.1}{Page replacement algorithms}{section.1}% 2
|
||||
\BOOKMARK [2][-]{subsection.1.2}{Other}{section.1}% 3
|
||||
\BOOKMARK [1][-]{section.2}{Laboratory}{}% 4
|
||||
\BOOKMARK [2][-]{subsection.2.1}{Instruction}{section.2}% 5
|
||||
\BOOKMARK [2][-]{subsection.2.2}{Configuration}{section.2}% 6
|
||||
\BOOKMARK [2][-]{subsection.2.3}{Procedure}{section.2}% 7
|
||||
\BOOKMARK [1][-]{section.3}{Finishing comments}{}% 8
|
||||
|
||||
Binary file not shown.
Binary file not shown.
@ -10,8 +10,9 @@
|
||||
\date{\today}
|
||||
\maketitle
|
||||
\section{Introduction}
|
||||
\subsection{Page replacament algorithms}
|
||||
\subsection{Page replacement algorithms}
|
||||
\paragraph{First in First out}
|
||||
What page replacament algorithm is being used? \\
|
||||
We use FIFO (First in First out) page replacement algorithm for those laboratories as indicated
|
||||
by the PageFault.java file line 18
|
||||
\begin{figure}[H]
|
||||
@ -45,16 +46,249 @@ We replace pages which in the future will not be used for the longest time.
|
||||
This is purely theoretical algorithm. It is perfect but not doable in practice
|
||||
since operating systems can not know future requests. \\
|
||||
It is used as a benchmark against which we compare other algorithms.
|
||||
\cite{Page Replacament Algorithms}
|
||||
\cite{Page Replacement Algorithms}
|
||||
\paragraph{Least Recently Used}
|
||||
We replace page which was not used for the longest time.
|
||||
\cite{Page Replacamanet Algorithms}
|
||||
We replace page which was not used for the longest time. \\
|
||||
It is based on the idea that we will in future work on pages which we used
|
||||
heavily in the past. In theory its performance can be close to optimal one but
|
||||
in practice it is expensive to implement. \\
|
||||
Most expensive way of implementing this algorithm is using linked lists. Most
|
||||
recently used pages in front, least recently used in the back. Every time we
|
||||
reference memory we have to move elements in list which takes a lot of time. \\
|
||||
We can also use operating system counter \\
|
||||
This algorithm is often used in different cheaper modified versions.
|
||||
\cite{Page Replacement Algorithms}
|
||||
\cite{pageWiki}
|
||||
\paragraph{Mapping}
|
||||
\subsection{Other}
|
||||
\paragraph{Memory Management Unit}
|
||||
Hardware unit which translates virtual memory to physical one.
|
||||
\cite{mmuWiki}
|
||||
\paragraph{Page fault}
|
||||
Exception raised when process wants to access page without preparations.
|
||||
Preparation consists of adding the mapping to process's virtual address space
|
||||
and/or loading page from a disk. MMU detects the fault but it is up to kernel
|
||||
and/or loading page from a disk.
|
||||
|
||||
\section{Laboratory}
|
||||
\subsection{Instruction}
|
||||
\begin{enumerate}
|
||||
\item Map 8 pages of physical memory to the first 8 pages of virtual
|
||||
memory
|
||||
\item Go through each virtual page and read from one virtual memory
|
||||
address
|
||||
\end{enumerate}
|
||||
\subsection{Configuration}
|
||||
In memory.conf file I changed the memset and mapped first 8 pages of virtual
|
||||
memory to first 8 pages of physical memory (we could use any physical memory
|
||||
pages we wanted so I settled for this for sake of simplicity)
|
||||
\begin{figure}[H]
|
||||
\caption{memory.conf file}
|
||||
\begin{lstlisting}
|
||||
// memset virt page # physical page # R (read from)
|
||||
// M (modified) inMemTime (ns) lastTouchTime (ns)
|
||||
memset 0 0 0 0 0 0
|
||||
memset 1 1 0 0 0 0
|
||||
memset 2 2 0 0 0 0
|
||||
memset 3 3 0 0 0 0
|
||||
memset 4 4 0 0 0 0
|
||||
memset 5 5 0 0 0 0
|
||||
memset 6 6 0 0 0 0
|
||||
memset 7 7 0 0 0 0
|
||||
|
||||
// enable_logging 'true' or 'false'
|
||||
// When true specify a log_file or leave blank for stdout
|
||||
enable_logging true
|
||||
|
||||
// log_file <FILENAME>
|
||||
// Where <FILENAME> is the name of the file you want output
|
||||
// to be print to.
|
||||
log_file tracefile
|
||||
|
||||
// page size, defaults to 2^14 and cannot be greater than 2^26
|
||||
// pagesize <single page size (base 10)> or <'power' num (base 2)>
|
||||
pagesize 16384
|
||||
|
||||
// addressradix sets the radix
|
||||
// in which numerical values are displayed
|
||||
// 2 is the default value
|
||||
// addressradix <radix>
|
||||
addressradix 16
|
||||
|
||||
// numpages sets the number of pages (physical and virtual)
|
||||
// 64 is the default value
|
||||
// numpages must be at least 2 and no more than 64
|
||||
// numpages <num>
|
||||
numpages 64
|
||||
\end{lstlisting}
|
||||
\end{figure}
|
||||
We want to access each virtual page and read from one virtualk memory address of
|
||||
each page. \\
|
||||
To achieve this we need to read from pages in increments of pagesize. Which is
|
||||
set by default to 16384 and I do not change that. \\
|
||||
We have 64 pages so the last address we will read from will be address
|
||||
\[ 64 \cdot 16384 = 1048576 \]
|
||||
And since we start from address number 0 we need to substract
|
||||
\[ 1048576 - 16384 = 1032192 \]
|
||||
And so the last address we will read from is \textbf{1032192} \\
|
||||
We modify the commands file accordingly
|
||||
\begin{figure}
|
||||
\caption{commands file}
|
||||
\begin{lstlisting}
|
||||
READ 0
|
||||
READ 16384
|
||||
READ 32768
|
||||
READ 49152
|
||||
READ 65536
|
||||
READ 81920
|
||||
READ 98304
|
||||
READ 114688
|
||||
READ 131072
|
||||
READ 147456
|
||||
READ 163840
|
||||
READ 180224
|
||||
READ 196608
|
||||
READ 212992
|
||||
READ 229376
|
||||
READ 245760
|
||||
READ 262144
|
||||
READ 278528
|
||||
READ 294912
|
||||
READ 311296
|
||||
READ 327680
|
||||
READ 344064
|
||||
READ 360448
|
||||
READ 376832
|
||||
READ 393216
|
||||
READ 409600
|
||||
[...]
|
||||
READ 704512
|
||||
READ 720896
|
||||
READ 737280
|
||||
READ 753664
|
||||
READ 770048
|
||||
READ 786432
|
||||
READ 802816
|
||||
READ 819200
|
||||
READ 835584
|
||||
READ 851968
|
||||
READ 868352
|
||||
READ 884736
|
||||
READ 901120
|
||||
READ 917504
|
||||
READ 933888
|
||||
READ 950272
|
||||
READ 966656
|
||||
READ 983040
|
||||
READ 999424
|
||||
READ 1015808
|
||||
READ 1032192
|
||||
\end{lstlisting}
|
||||
\end{figure}
|
||||
\subsection{Procedure}
|
||||
After modifying config files I run the simulation using make compile and make
|
||||
run in work directory and go step by step through the program.
|
||||
\begin{figure}[H]
|
||||
\caption{tracefile}
|
||||
\begin{lstlisting}
|
||||
READ 0 ... okay
|
||||
READ 4000 ... okay
|
||||
READ 8000 ... okay
|
||||
READ c000 ... okay
|
||||
READ 10000 ... okay
|
||||
READ 14000 ... okay
|
||||
READ 18000 ... okay
|
||||
READ 1c000 ... okay
|
||||
READ 20000 ... okay
|
||||
READ 24000 ... okay
|
||||
READ 28000 ... okay
|
||||
READ 2c000 ... okay
|
||||
READ 30000 ... okay
|
||||
READ 34000 ... okay
|
||||
READ 38000 ... okay
|
||||
READ 3c000 ... okay
|
||||
READ 40000 ... okay
|
||||
READ 44000 ... okay
|
||||
[...]
|
||||
READ 54000 ... okay
|
||||
READ 58000 ... okay
|
||||
READ 5c000 ... okay
|
||||
READ 60000 ... okay
|
||||
READ 64000 ... okay
|
||||
READ 68000 ... okay
|
||||
READ 6c000 ... okay
|
||||
READ 70000 ... okay
|
||||
READ 74000 ... okay
|
||||
READ 78000 ... okay
|
||||
READ 7c000 ... okay
|
||||
READ 80000 ... page fault
|
||||
READ 84000 ... page fault
|
||||
READ 88000 ... page fault
|
||||
READ 8c000 ... page fault
|
||||
READ 90000 ... page fault
|
||||
READ 94000 ... page fault
|
||||
READ 98000 ... page fault
|
||||
READ 9c000 ... page fault
|
||||
READ a0000 ... page fault
|
||||
READ a4000 ... page fault
|
||||
[...]
|
||||
READ e4000 ... page fault
|
||||
READ e8000 ... page fault
|
||||
READ ec000 ... page fault
|
||||
READ f0000 ... page fault
|
||||
READ f4000 ... page fault
|
||||
READ f8000 ... page fault
|
||||
READ fc000 ... page fault%
|
||||
\end{lstlisting}
|
||||
\end{figure}
|
||||
As we can see mapping first 8 pages was successful. Their mapping was specified
|
||||
in memory.conf file and they were mapped as expected. \\
|
||||
Then pages up to 32 were also mapped correctly \\
|
||||
Then we get to page number 32 and we get page fault. We do not have mapping
|
||||
between this page and physical page so we use algorithm of first in first out
|
||||
and map page 32 to page 0, which was mapped to virtual page 0 in the first step.
|
||||
\\
|
||||
This process gets repeated up to the last page. We take the virtual page which
|
||||
was mapped to physical one as a first one and we map it to virtual page which
|
||||
got page fault error. \\
|
||||
This can be observed on following screens:
|
||||
\begin{figure}[H]
|
||||
\caption{Very start of application}
|
||||
\includegraphics[width=\linewidth]{mm1}
|
||||
\end{figure}
|
||||
\begin{figure}[H]
|
||||
\caption{First step correctly mapped}
|
||||
\includegraphics[width=\linewidth]{mm2}
|
||||
\end{figure}
|
||||
\begin{figure}[H]
|
||||
\caption{16th page correctly mapped}
|
||||
\includegraphics[width=\linewidth]{mm3}
|
||||
\end{figure}
|
||||
\begin{figure}[H]
|
||||
\caption{First page fault on 32th step}
|
||||
\includegraphics[width=\linewidth]{mm4}
|
||||
\end{figure}
|
||||
\begin{figure}[H]
|
||||
\caption{First in First out, we map page 0 physical to the page we just
|
||||
got page fault on}
|
||||
\includegraphics[width=\linewidth]{mm5}
|
||||
\end{figure}
|
||||
\begin{figure}[H]
|
||||
\caption{Again first in, first out}
|
||||
\includegraphics[width=\linewidth]{mm6}
|
||||
\end{figure}
|
||||
\begin{figure}[H]
|
||||
\caption{Final view of application}
|
||||
\includegraphics[width=\linewidth]{mm7}
|
||||
\end{figure}
|
||||
\section{Finishing comments}
|
||||
Both by looking at the source code and simulation results we can say that the
|
||||
simulation uses First in First out algorithm. First 8 pages were mapped
|
||||
correctly because of the memory.conf file, pages up to 32 were mapped correctly
|
||||
because they are mapped by default by the application. \\
|
||||
Then we got page faults which were resolved by first in first out algorithm.
|
||||
\begin{thebibliography}{9}
|
||||
\bibitem{mmuWiki} \href{https://en.wikipedia.org/wiki/Memory_management_unit}{Wiki Memory Management Unit}
|
||||
\bibitem{faultWiki} \href{https://en.wikipedia.org/wiki/Page_fault}{[Wiki Page Fault]}
|
||||
\bibitem{Page Replacement Algorithms}
|
||||
\href{https://www.geeksforgeeks.org/page-replacement-algorithms-in-operating-systems/}{[Geeks
|
||||
for Geeks page replacament algorithms]}
|
||||
|
||||
Binary file not shown.
@ -1,11 +1,73 @@
|
||||
// Enter READ/WRITE commands into this file
|
||||
// READ <OPTIONAL number type: bin/hex/oct> <virtual memory address or random>
|
||||
// WRITE <OPTIONAL number type: bin/hex/oct> <virtual memory address or random>
|
||||
READ bin 100
|
||||
READ 19
|
||||
WRITE hex CC32
|
||||
READ bin 100000000000000
|
||||
READ bin 100000000000000
|
||||
WRITE bin 110000000000001
|
||||
WRITE random
|
||||
// Enter READ/WRITE commands into this file
|
||||
// READ <OPTIONAL number type: bin/hex/oct> <virtual memory address or random>
|
||||
// WRITE <OPTIONAL number type: bin/hex/oct> <virtual memory address or random>
|
||||
//64 addresses increasing by 16384
|
||||
READ 0
|
||||
READ 16384
|
||||
READ 32768
|
||||
READ 49152
|
||||
READ 65536
|
||||
READ 81920
|
||||
READ 98304
|
||||
READ 114688
|
||||
READ 131072
|
||||
READ 147456
|
||||
READ 163840
|
||||
READ 180224
|
||||
READ 196608
|
||||
READ 212992
|
||||
READ 229376
|
||||
READ 245760
|
||||
READ 262144
|
||||
READ 278528
|
||||
READ 294912
|
||||
READ 311296
|
||||
READ 327680
|
||||
READ 344064
|
||||
READ 360448
|
||||
READ 376832
|
||||
READ 393216
|
||||
READ 409600
|
||||
READ 425984
|
||||
READ 442368
|
||||
READ 458752
|
||||
READ 475136
|
||||
READ 491520
|
||||
READ 507904
|
||||
READ 524288
|
||||
READ 540672
|
||||
READ 557056
|
||||
READ 573440
|
||||
READ 589824
|
||||
READ 606208
|
||||
READ 622592
|
||||
READ 638976
|
||||
READ 655360
|
||||
READ 671744
|
||||
READ 688128
|
||||
READ 704512
|
||||
READ 720896
|
||||
READ 737280
|
||||
READ 753664
|
||||
READ 770048
|
||||
READ 786432
|
||||
READ 802816
|
||||
READ 819200
|
||||
READ 835584
|
||||
READ 851968
|
||||
READ 868352
|
||||
READ 884736
|
||||
READ 901120
|
||||
READ 917504
|
||||
READ 933888
|
||||
READ 950272
|
||||
READ 966656
|
||||
READ 983040
|
||||
READ 999424
|
||||
READ 1015808
|
||||
READ 1032192
|
||||
|
||||
|
||||
|
||||
64
EOPSY/lab4/task4/work/tracefile
Normal file
64
EOPSY/lab4/task4/work/tracefile
Normal file
@ -0,0 +1,64 @@
|
||||
READ 0 ... okay
|
||||
READ 4000 ... okay
|
||||
READ 8000 ... okay
|
||||
READ c000 ... okay
|
||||
READ 10000 ... okay
|
||||
READ 14000 ... okay
|
||||
READ 18000 ... okay
|
||||
READ 1c000 ... okay
|
||||
READ 20000 ... okay
|
||||
READ 24000 ... okay
|
||||
READ 28000 ... okay
|
||||
READ 2c000 ... okay
|
||||
READ 30000 ... okay
|
||||
READ 34000 ... okay
|
||||
READ 38000 ... okay
|
||||
READ 3c000 ... okay
|
||||
READ 40000 ... okay
|
||||
READ 44000 ... okay
|
||||
READ 48000 ... okay
|
||||
READ 4c000 ... okay
|
||||
READ 50000 ... okay
|
||||
READ 54000 ... okay
|
||||
READ 58000 ... okay
|
||||
READ 5c000 ... okay
|
||||
READ 60000 ... okay
|
||||
READ 64000 ... okay
|
||||
READ 68000 ... okay
|
||||
READ 6c000 ... okay
|
||||
READ 70000 ... okay
|
||||
READ 74000 ... okay
|
||||
READ 78000 ... okay
|
||||
READ 7c000 ... okay
|
||||
READ 80000 ... page fault
|
||||
READ 84000 ... page fault
|
||||
READ 88000 ... page fault
|
||||
READ 8c000 ... page fault
|
||||
READ 90000 ... page fault
|
||||
READ 94000 ... page fault
|
||||
READ 98000 ... page fault
|
||||
READ 9c000 ... page fault
|
||||
READ a0000 ... page fault
|
||||
READ a4000 ... page fault
|
||||
READ a8000 ... page fault
|
||||
READ ac000 ... page fault
|
||||
READ b0000 ... page fault
|
||||
READ b4000 ... page fault
|
||||
READ b8000 ... page fault
|
||||
READ bc000 ... page fault
|
||||
READ c0000 ... page fault
|
||||
READ c4000 ... page fault
|
||||
READ c8000 ... page fault
|
||||
READ cc000 ... page fault
|
||||
READ d0000 ... page fault
|
||||
READ d4000 ... page fault
|
||||
READ d8000 ... page fault
|
||||
READ dc000 ... page fault
|
||||
READ e0000 ... page fault
|
||||
READ e4000 ... page fault
|
||||
READ e8000 ... page fault
|
||||
READ ec000 ... page fault
|
||||
READ f0000 ... page fault
|
||||
READ f4000 ... page fault
|
||||
READ f8000 ... page fault
|
||||
READ fc000 ... page fault
|
||||
Loading…
Reference in New Issue
Block a user