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% Document Info
\author{Mitali}
\pdfinfo{
  /Title (1-process-scheduling.pdf)
  /Creator (Cheatography)
  /Author (Mitali)
  /Subject (1.Process Scheduling Cheat Sheet)
}

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\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
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    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{1.Process Scheduling Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Mitali} via \textcolor{DarkBackground}{\uline{cheatography.com/128362/cs/25168/}}}
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\noindent
\begin{multicols}{3}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}Mitali \\
  \uline{cheatography.com/mitali} \\
  \end{tabulary}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 10th November, 2020.\\
   Updated 10th November, 2020.\\
   Page {\thepage} of \pageref{LastPage}.
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  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
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\end{multicols}}




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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{{\bf{Scheduling Queue}}}}  \tn
% Row 0
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\mymulticolumn{1}{x{5.377cm}}{{\bf{Job Queue :}}A process when enters a system is put into a {\emph{job queue}} .} \tn 
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\mymulticolumn{1}{x{5.377cm}}{{\bf{Ready Queue:}} The processes residing in main memory and ready for execution are put in the {\emph{ready queue}}.} \tn 
% Row Count 5 (+ 3)
% Row 2
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\mymulticolumn{1}{x{5.377cm}}{{\bf{Device Queue:}} The processes waiting for a particular I/O device are put into the {\emph{device queue}}.} \tn 
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\par\addvspace{1.3em}

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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{{\bf{Scheduling Criteria}}}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{{\bf{1. CPU Utilization:}} It should be {\emph{maximum}}. 40\%  minimum- 90\% maximum.} \tn 
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\mymulticolumn{1}{x{5.377cm}}{{\bf{2. Throughput:}} Number of processes that are completed per unit time are called {\emph{throughput}}. It should be {\emph{maximum}}.} \tn 
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% Row 2
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\mymulticolumn{1}{x{5.377cm}}{{\bf{3. Turnaround Time:}} The interval from time of submission of process to time of completion. {\emph{Turnaround time= period spent waiting+ready queue time+execution+I/O interrupt time}}. It should be {\emph{minimum}}.} \tn 
% Row Count 10 (+ 5)
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{{\bf{5. Multilevel Queue Scheduling}}}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Scheduling Algorithm decides which process should the CPU be allocated to. There are {\emph{six scheduling algorithms}}.} \tn 
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{{\bf{ First Come First Serve  Shortest Job First }}}}  \tn
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The process that requests for the CPU first, gets the access first. & Each process has the length of the next CPU burst. \tn 
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FIFO queue is used in handling the process. & The process with the smallest next CPU burst gets access to the process. \tn 
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Long waiting time for the next processes. & Comparitively less waiting time for next process. \tn 
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It is a {\emph{non-preemptive}} algorithm. & It can be {\emph{premptive or non-preemptive}} algorithm. \tn 
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{{\bf{Priority Scheduling  Round Robin Scheduling }}}}  \tn
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Each process has a {\emph{priority}}. & There is a fixed {\emph{time quantum}}. \tn 
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CPU allocated to the process with higher priority. & Ready queue is treated as a {\emph{circular queue}} and CPU is allocated to the First process for specific time quantum. \tn 
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{\bf{Problem:}} Starvation of low priority process.{\bf{Solution:}} {\emph{AGING}} & {\bf{Problem:}} If time quantum is too large, algorithm works as FCFS. \tn 
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It can be {\emph{preemptive or non-preemptive}} & It is {\emph{preemptive}}. \tn 
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{{\bf{Multilevel Queue  Multilevel Feedback Queue}}}}  \tn
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Ready queue is divided into: {\emph{Foreground (interactive) process}} and {\emph{Background (batch) process}}. & Allows the process from one queue to move to the next queue. \tn 
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{\bf{Foreground}} implements {\emph{Round Robin Scheduling.}} and {\bf{Background}} implements {\emph{FCFS.}} & Here processes are separated according to their CPU burst. \tn 
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\mymulticolumn{1}{x{5.377cm}}{{\bf{Long Term Scheduler:}} Also known as {\emph{job scheduler}} selects process from disk and puts into memory.} \tn 
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% Row 1
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\mymulticolumn{1}{x{5.377cm}}{{\bf{Short Term Scheduler:}} Also known as {\emph{CPU scheduler}} select process from memory and allocates a CPU to it.} \tn 
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% Row 2
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\mymulticolumn{1}{x{5.377cm}}{{\bf{Medium Term Scheduler:}} It is used to remove a process from and reduce degree of multi-programing .Later it can be re-introduced from point where it was left . This is called as {\emph{swapping}}.} \tn 
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{{\bf{Scheduling Criteria}}}}  \tn
% Row 0
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\mymulticolumn{1}{x{5.377cm}}{{\bf{4. Waiting Time:}} The time for which the process has to wait in the ready queue is {\emph{waiting time.}} It should be {\emph{minimum}}.} \tn 
% Row Count 3 (+ 3)
% Row 1
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\mymulticolumn{1}{x{5.377cm}}{{\bf{5. Response Time:}} Time taken to respond to a process is {\emph{response time}}. It should be {\emph{minimum}}.} \tn 
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{{\bf{2. Shortest Job First (SJF)}}}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{{\bf{6. Multilevel Feedback Queue Scheduling}}}}  \tn
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% That's all folks
\end{multicols*}

\end{document}