o4 Policies
Below is a listing of the policies on this system. For a
listing of the general policies on this campus, see University-wide
Computing Policies & Procedures.
1) Resource Utilization
1.1) Processor Utilization
A Computationally Intensive Job is one that requires more than
60 minutes of processor time. Such jobs typically consume more
than 50% of processor utilization. Users are allowed only one
Computationally Intensive Job at a time. Additional jobs of this
nature will be termintated.
All Computationally Intensive Jobs must be run with a
"nice" value of at least 10. All supported shells have
been configured to use /usr/bin/nice. So, to correctly nice an
interactive job, simply do the following:
% nice job (for tcsh or csh)
$ nice job (for bash or sh)
Non-interactive Computationally Intensive Jobs that are to be
run in the background can be started using the following
commands:
% nice job & (for tcsh or csh)
$ nohup nice job & (for bash or sh)
The bash and sh shells require nohup if the job is to
proceed after logging out. Unless explicitly redirected, all
output, including errors, for the command started with nohup
will go into the file "nohup.out". To explicitly
redirect the output under bash and sh, do the following:
$ nohup nice job > out 2> err &
Using this command, all standard output will go into the file out
while all errors will go into the file err.
Redirection under the tcsh and csh shells is similar, but
standard output and standard error cannot be redirected to
different locations quiet so easily. To run a background job with
redirection under these shells, do the following:
% ( nice job > out ) >& err &
If you have any questions about a particular shell syntax,
call 565-2324 or send E-Mail to helpdesk@unt.edu.
1.2) Memory Utilization
Users should take care to keep from taxing the memory resources of the system.
Jobs that utilize memory resources to the point of interfering with other users'
ability to use the system or with the system's ability to
operate at an optimum level may be terminated.
1.3) Exceptions
Exceptions to the above policies must be obtained at least 24
hours in advance and are only available through the Computing
Center office during regular office hours.
2) Privacy Considerations
Commands like ps, top, w,
and who are unrestricted.
3) Use of Servers
3.1) Definition of Server
A server is any process that has the potential of providing
any resources to users other than yourself. This includes users
on the same system or users on other hosts on the Internet.
3.2) Restriction on Servers
User-run servers of any kind are not allowed on this system. o4
is meant to provide computing resources to campus researchers. It
is not meant to provide a server for resources to the general
Internet community.
4) Account Sharing
Letting someone else use your account is against University
policy. The policy prohibits all users from sharing accounts,
logging into an account to allow someone else to use it, and
sharing passwords.
If you suspect that someone may have broken into your account,
please let us know, and change your password as soon as possible.
5) Account Expiration
Faculty/Staff/Student account eligibility expires immediately upon termination of
employment or enrollment.
6) Use of .rhosts file
The use of the "+" entry in an .rhosts
file is prohibited on this system. Use of .rhost files is
discouraged.
The Account Sharing policy also applies to
the use of .rhosts files.
For more information on the use of .rhosts files, see
the on-line manual: man rhosts.
7) Using /tmp
Please do not save any files to /tmp. Use your home directory for
downloading files. This space is reserved solely for utilities that must
create temporary files. It is not intended nor is large enough to be used
as personal scratch space. Any files placed on /tmp will
be deleted without notice.
8) Using /scratch
No /scratch partition has been provided for temporary disk space. Your home
directory has been provided with enough storage to serve this need. Please remember to
delete any temporary files from your home directory when no longer needed.
9) Appropriate Use
Accounts granted on UNT machines can only be used for academic
purposes. In particular, UNT accounts, including those on o4,
cannot be used for conducting official commerce. o4 services are
provided to faculty and students for the benefit of their
research activities while at UNT. These resources cannot be used
to subsidize commercial businesses.
10) Quota Allocation
No quota is applied to disk storage on o4. However, system management reserves
the right to restrict or revoke access should one user's utilization of disk storage
interfere with other users' ability to use the system or with the system's ability to
operate at an optimum level. Questions about disk storage can be directed to Dr.
Philip Baczewski,
Director of Academic Computing and User Services.
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This document last updated by: Philip Baczewski
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