# MOSS Scheduling Simulator
Installation on Unix/Linux/Solaris/HP-UX Systems

## Purpose

This document provides instructions for the installation of the MOSS Scheduling Simulator on Unix operating systems. This procedure should be the same or similar on Unix, Linux, Solaris, HP-UX and other Unix-compatible systems. The MOSS software is designed for use with Andrew S. Tanenbaum, Modern Operating Systems, 2nd Edition (Prentice Hall, 2001). The Scheduling Simulator was written by Alex Reeder (alexr@e-sa.org). This installation guide was written by Ray Ontko (rayo@ontko.com).

This installation guide only provides information about installing the software and testing the configuration for Unix-like operating systems. To install on Windows operating systems, please read the Installation Guide for Win95/98/Me/NT/2000 Systems. For more detailed information about the simulator, please read the User Guide.

## Requirements

The following software components are required to install and use the MOSS Scheduling Simulator.

- X-windows environment for running Java Application Window Toolkit (AWT) programs
- Java Development Kit (JDK) 1.0 or greater
- Text program editor (e.g., notepad)

## Pre-Installation

Before installation, you should verify:

- that you have a working java runtime environment,
- that you have a working java development environment, and
- that the working directory is in the classpath for the runtime environment.

If you're using a standard command-line java compiler, the following instructions will help determine if your environment is configured correctly.

1. Verify that you have java installed and configured in your environment.

   >     $ java -version

   You should see a message like this with possibly a different version number.

   >     java version "1.1.8"

   If you get a message like:

   >     java: Command not found.

   Then java may not be installed on your system, or may not be configured for your use.

   If you think that Java may already be installed on your system but may not be in your "path", you can find it by

   >     $ find /usr -name java -print

   On my system, for example, the following is returned.

   >     /usr/lib/netscape/477/communicator/java
   >     /usr/lib/netscape/477/netscape/java
   >     /usr/lib/jdk1.1/bin/java
   >     /usr/lib/jdk1.1/bin/ia32/green_threads/java
   >     /usr/share/java
   >     /usr/bin/java
   >     /usr/src/kernel-source-2.2.17/include/config/binfmt/java

   On my system, I also searched for "javac" and found that it exists in /usr/bin/java. I'll use this jdk for my installation.

   If Java isn't available on your system, you should check with your instructor or system administrator. If you administer your own system, then you should be able to find a copy of Java for your operating system.

   If you find that java is installed but not configured for your use, then perhaps you need to add it to your path. Consult your instructor or system administrator if you need help adding this to your path.

2. Verify that the java compiler is installed and configured in your environment.

   >     $ javac

   If you're using a standard java command-line compiler, you should see a message similar to this.

   >     use: javac [-g][-O][-debug][-depend][-nowarn][-verbose][-classpath path][-nowrite][-deprecation][-d dir][-J<runtime flag>] file.java...

   If you get a message like:

   >     javac: Command not found.

   then the java compiler may not be installed on your system, or may not be configured for your use. Consult your instructor or system administrator.

3. Verify that that the current directory is in your classpath.

   >     $ echo $CLASSPATH

   You should see a list of directories separated by colons (":") or possibly just a blank line. If you don't see the directory "." (a single period, which stands for the current directory), then you should add it to the claspath.

   Determine which shell you're using:

   >     $ echo $SHELL

   If you're using sh, ksh, or bash:

   >     $ CLASSPATH=.:$CLASSPATH
   >     $ export CLASSPATH

   If you're using csh, or tcsh:

   >     % set CLASSPATH=.:$CLASSPATH

If you have a working java runtime environment, a working java compiler, and the current directory is in your path, then you're ready to proceed with the installation.

## Installation

Installation of the software can be accomplished with these simple steps:

1. Create a directory in which you wish to install the simulator (e.g., "moss/sched").

   >     $ cd
   >     $ mkdir moss
   >     $ cd moss
   >     $ mkdir sched
   >     $ cd sched

2. Download the compressed tar archive (sched.tgz) into the directory. The latest release for this file can always be found at http://www.ontko.com/moss/sched/sched.tgz.

3. Expand the compressed tar archive.

   >     $ tar -xzf sched.tgz

   or

   >     $ gunzip sched.tgz
   >     $ tar xf sched.tar

## Files

The directory should now contain the following files:

Files | Description
--- | ---
sched.tgz | Compressed tar archive which contains all the other files.
Common.java Process.java Results.java Scheduling.java SchedulingAlgorithm.java sProcess.java | Java source files (*.java)
Common.class Process.class Results.class Scheduling.class SchedulingAlgorithm.class sProcess.class | Compiled Java class files (*.class)
scheduling.conf | Sample configuration file
install_unix.html install_windows.html user_guide.html | Documentation
COPYING.TXT | Gnu General Public License: Terms and Conditions for Copying, Distribution, and Modification

## Compilation

The distribution includes compiled class files as well as the source java files. You should not need to recompile unless you decide to change the code. If you wish to compile the code, the following commands should work if you're using a Java compiler that accepts the normal "javac" command line.

To determine which shell you're using:

>     $ echo $SHELL

If you're using sh, ksh, bash:

>     $ CLASSPATH=.
>     $ export CLASSPATH
>     $ javac -nowarn *.java

If you're using csh, tcsh:

>     % set CLASSPATH=.
>     % javac -nowarn *.java

The `-nowarn` flag supresses warning messges, of which there may be several. For backward compatability we use only those features of Java which have been present from the beginning, some of which are deprecated and are usually reported by the compiler with warning messages.

## Test

To test the program, enter the following commands.

>     $ java Scheduling scheduling.conf

The program will simply run the simulation based on the information provided in `scheduling.conf` and write its output to the `Summary-Results` and `Summary-Processes` files. You should see the following output.

>     Working...
>     Completed.

The simulation configuration information is read from a file called "scheduling.conf". The "scheduling.conf" file looks something like this:

>     // # of Process
>     numprocess 3

>     // mean deivation
>     meandev 1100

>     // standard deviation
>     standdev 510

>     // process    # I/O blocking
>     process 100
>     process 500
>     process 30

>     // duration of the simulation in milliseconds
>     runtime 5000

If things are working correctly, the "Summary-Results" file should look something like this:

>     Scheduling Type: Batch (Nonpreemptive)
>     Scheduling Name: First-Come First-Served
>     Simulation Run Time: 2750
>     Mean: 1100
>     Standard Deviation: 510
>     Process #	CPU Time	IO Blocking	CPU Completed	CPU Blocked
>     0		1372 (ms)	100 (ms)	1372 (ms)	13 times
>     1		689 (ms)	500 (ms)	689 (ms)	1 times
>     2		689 (ms)	30 (ms)		689 (ms)	22 times

and the "Summary-Processes" file should look something like this:

>     Process: 0 registered... (1372 100 0 0)
>     Process: 0 I/O blocked... (1372 100 100 100)
>     Process: 1 registered... (689 500 0 0)
>     Process: 1 I/O blocked... (689 500 500 500)
>     Process: 0 registered... (1372 100 100 100)
>     Process: 0 I/O blocked... (1372 100 200 200)
>     Process: 1 registered... (689 500 500 500)
>     Process: 1 completed... (689 500 689 689)
>     Process: 0 registered... (1372 100 200 200)
>     Process: 0 I/O blocked... (1372 100 300 300)
>     Process: 2 registered... (689 30 0 0)
>     Process: 2 I/O blocked... (689 30 30 30)
>     Process: 0 registered... (1372 100 300 300)
>     Process: 0 I/O blocked... (1372 100 400 400)
>     Process: 2 registered... (689 30 30 30)
>     Process: 2 I/O blocked... (689 30 60 60)
>     Process: 0 registered... (1372 100 400 400)
>     Process: 0 I/O blocked... (1372 100 500 500)
>     Process: 2 registered... (689 30 60 60)
>     Process: 2 I/O blocked... (689 30 90 90)
>     Process: 0 registered... (1372 100 500 500)
>     Process: 0 I/O blocked... (1372 100 600 600)
>     Process: 2 registered... (689 30 90 90)
>     Process: 2 I/O blocked... (689 30 120 120)
>     Process: 0 registered... (1372 100 600 600)
>     Process: 0 I/O blocked... (1372 100 700 700)
>     Process: 2 registered... (689 30 120 120)
>     Process: 2 I/O blocked... (689 30 150 150)
>     Process: 0 registered... (1372 100 700 700)
>     Process: 0 I/O blocked... (1372 100 800 800)
>     Process: 2 registered... (689 30 150 150)
>     Process: 2 I/O blocked... (689 30 180 180)
>     Process: 0 registered... (1372 100 800 800)
>     Process: 0 I/O blocked... (1372 100 900 900)
>     Process: 2 registered... (689 30 180 180)
>     Process: 2 I/O blocked... (689 30 210 210)
>     Process: 0 registered... (1372 100 900 900)
>     Process: 0 I/O blocked... (1372 100 1000 1000)
>     Process: 2 registered... (689 30 210 210)
>     Process: 2 I/O blocked... (689 30 240 240)
>     Process: 0 registered... (1372 100 1000 1000)
>     Process: 0 I/O blocked... (1372 100 1100 1100)
>     Process: 2 registered... (689 30 240 240)
>     Process: 2 I/O blocked... (689 30 270 270)
>     Process: 0 registered... (1372 100 1100 1100)
>     Process: 0 I/O blocked... (1372 100 1200 1200)
>     Process: 2 registered... (689 30 270 270)
>     Process: 2 I/O blocked... (689 30 300 300)
>     Process: 0 registered... (1372 100 1200 1200)
>     Process: 0 I/O blocked... (1372 100 1300 1300)
>     Process: 2 registered... (689 30 300 300)
>     Process: 2 I/O blocked... (689 30 330 330)
>     Process: 0 registered... (1372 100 1300 1300)
>     Process: 0 completed... (1372 100 1372 1372)
>     Process: 2 registered... (689 30 330 330)
>     Process: 2 I/O blocked... (689 30 360 360)
>     Process: 2 registered... (689 30 360 360)
>     Process: 2 I/O blocked... (689 30 390 390)
>     Process: 2 registered... (689 30 390 390)
>     Process: 2 I/O blocked... (689 30 420 420)
>     Process: 2 registered... (689 30 420 420)
>     Process: 2 I/O blocked... (689 30 450 450)
>     Process: 2 registered... (689 30 450 450)
>     Process: 2 I/O blocked... (689 30 480 480)
>     Process: 2 registered... (689 30 480 480)
>     Process: 2 I/O blocked... (689 30 510 510)
>     Process: 2 registered... (689 30 510 510)
>     Process: 2 I/O blocked... (689 30 540 540)
>     Process: 2 registered... (689 30 540 540)
>     Process: 2 I/O blocked... (689 30 570 570)
>     Process: 2 registered... (689 30 570 570)
>     Process: 2 I/O blocked... (689 30 600 600)
>     Process: 2 registered... (689 30 600 600)
>     Process: 2 I/O blocked... (689 30 630 630)
>     Process: 2 registered... (689 30 630 630)
>     Process: 2 I/O blocked... (689 30 660 660)
>     Process: 2 registered... (689 30 660 660)
>     Process: 2 completed... (689 30 689 689)

The program and its input and output files are described more fully in the MOSS Scheduling Simulator User Guide.

© Copyright 2001, Prentice-Hall, Inc. This program is free software; it is distributed under the terms of the Gnu General Public License. See COPYING.TXT, included with this distribution.

Please send suggestions, corrections, and comments to Ray Ontko (rayo@ontko.com).

Last updated: July 7, 2001