Setting Up Environment for Your CS Account

1
Setting Up Environment for Your CS Account

• COMP346/5461 - Operating Systems
• Tutorial 1 Part 1.5
• Revision 1.2
• Date September 9, 2003

2
Why Java 1.2.1? (1)

• For the purpose of learning various concurrency
  problems for the time being were stuck with the
  above mentioned JDK version on Solaris 8. JVM of
  that version uses so-called green threads by
  default, and manages them itself using the Round
  Robin with priority scheduling policy (there are
  many policies out there, youll get to know what
  most of them are later on in the course), so the
  behaviour of the threads can be considered
  deterministic.
• NOTE There is no Java 1.2.1 for Linux! Thus, if
  you intend to use Linux, use 1.2.2 with green
  threads.

3
Why Java 1.2.1? (2)

• With later versions, especially 1.3. and above,
  the JVM basically lets the OS schedule the
  threads, and whatever policy the OS employs and
  on how many CPUs an application is run, makes it
  completely unpredictable.
• NOTE JVM of (virtually) any version, including
  1.2.1 and 1.2.2 does not work well for us on
  Windows 9x/Me platforms! Work either remotely or
  install Cygwin (an UNIX emulation layer for
  Windows) and work under it.

4
Setting Up the Environment

• You will have to use your CS account to do
  programming assignments (well, if youre are
  reluctant to come to the lab, you can do your
  thing at home or any other place, but just either
  download and install JDK 1.2.1, or if you have a
  high speed Internet somewhere, you can always ssh
  into alpha and do the thing remotely (look up
  PuTTY in Google if you plan to do it in Windows)).

5
Setting Up the Environment (2)

• If you use your CS account in labs...
• Log in...
• If you logged in Linux, ssh to alpha first (you
  always have to do it before compiling and running
  java code for this course otherwise, youll end
  up using whatever Java they have in those Linux
  boxes) by typing in the followingssh -X alpha
• On Windows use either Tera Term (which is on your
  desktop under icon telnet) with the option
  ssh and the host alpha or through PuTTY (same
  thing, but more convenient).
• Most likely its not configured to use Java
  1.2.1, youll have to do some work to make
  happen.
• How? Please go to the next slide ----gt

6
Setting Up the Environment (3)

• So... edit your .cshrc file in your home
  directory (dont worry, this is only a one-time
  procedure).
• Use your favorite text editor and
  typeyourtexteditorhere /.cshrc(What? Dont
  have a favorite text editor yet? -) Here are
  some suggestions to pick from xemacs, emacs,
  vim, pico, ...)
• Among the lines there should be something like
  thisset path( /usr/ucb /usr/bin /usr/sbin /bin
  ...)So, add at the beginning /pkg/java-1.2.1/bin
  set path( /pkg/java-1.2.1/bin /usr/ucb
  /usr/bin /usr/sbin /bin ...)DO NOT REMOVE
  ANYTHING FROM THIS LINE UNLESS YOU KNOW WHAT YOU
  ARE DOING.
• After saving the above, type in the following, so
  your changes take effectsource /.cshrcrehash

7
Setting Up the Environment (4)

• Check the Java versionjava -versionIf you
  see smth like this you should be all setjava
  version "1.2.1Classic VM (build JDK-1.2.1-A,
  green threads, sunwjit)
• Come to labs to actually set this thing up and
  ask your lab instructor if you require some
  assistance.

8
References

1. www.cygwin.com
2. www.chiark.greenend.org.uk/sgtatham/putty/downloa
   d.html
3. man ssh