Learning Group Computer Guide
Computers in the learning group are roughly categorized into three classes:
These are fast machines that are intended to run programs.
These are machines that are intended for people to work with (editing,
compiling, surfing the net, playing games (not!))
These are workstations with faster CPU (sometimes dual cpu) and much
memory. They serve both functions.
These machines run Windows (TM) operating system. They can be used
to log in to other machines and to run MS-friendly applications.
CPU Usage Guidelines
The computers are here for all of us. By sharing resources we can all access
larger bandwidth most of the time. The philosophy is that there is enough
to go around.
To avoid conflicts, please try to use your common sense and to follow
these simple guidelines:
We trust the communications between lab members to coordinate usage when
several people have deadlines. Talk before shooting (or shouting).
Be considerate! Don't do onto others what you don't want them to
do to you.
Heavy long term processes should be run on CPU/Mixed servers. Use workstations
only when CPU servers are heavily used.
Compilations, Netscape, editors, should be run on the machine you are currently
If you are running a job on a workstation please nice +19, so that the
user working with it would not suffer long delays while typing in emacs.
Make sure that the process does not consume more memory than the
machine has!!! (In this case the machine will start paging and stop responding
regardless of the nice you set)
Night time is good for running heavy processes on workstations
If a job is causing problems, try to contact owner before killing it. If
you must kill it, use kill -STOP before resorting to more violent measures
Again, be considerate
DISK Usage Guidelines
There are three levels of Backuping and reliability on disk:
Heavy Backuping (4 time a day+/two weeks back + on tape): your own home
Use for source code, TEX files and the like (hard to reproduce
- high reliability, low backup: The RAID
we have a RAID (level 5 + one spare) called "duff" (/cs/duff[1..2(3?)]). This
can withstand 2 disk failures without loss of data. use for normal work,
large, hard to get, data sets and the such.
- no backup, no reliability: The local disks on the computers (named
/cs/pmai[1-7] and /cs/[hmm, sound, hmm+, chord, pst, ....]). there is basicly
NO BACKUP on those disks. On the other hand, it's been quite a while since the
last disk fail, so this is fairly safe. Use for big, easy to download or
reproduce databases, run results and the such. If you tend to work on one
particular computer, try using the local Disk, as it is MUCH faster.
Ran Bachrach (ranb@cs) and/or Matan Ninio (ninio@cs) are coordinating our
problems with the system. Please make sure that they are aware of problems
you are encountering. Remember to cc them in any complaint sent to the
system group, and preferably, if possible, check with them beforehand.
you can directly open a terminal on a machine (from within cs) by clicking on
if you use this on a regular bases, you may want to change the following
settings in your netscape (in Edit->Preferences->Navigator->applications):
rlogin (Edit...) - change application to "xon %h"
TN3270 application (Edit...) - change application to "xon %h xosview"