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
% 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 firstname.lastname@example.org.
1.2) Memory Utilization
A Memory Intensive Job is one that has a combined data and
stack size greater than 128 MBytes or uses 20% or more of real
memory. Using the command /usr/ucb/ps -vx, the combined
data and stack size for each process is shown under the
"SIZE" column while the memory usage is shown under the
There is a limit of one Memory Intensive Job at a time per
user. Jobs that exceed this limit may be terminated.
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. Sol
is meant to provide computing resources to campus researchers. It
is not meant to provide a server for resources to the general
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
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
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 /scratch for
downloading files. /tmp just isn't large enough, and if it gets
full, basically everyone on the system has to wait until the
space is cleared up.
DO NOT manually place any files in this
directory (/tmp). 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. If you
need some temporary scratch space, please
use /scratch, that's what it's
there for. Any files placed on /tmp will
be deleted without notice.
8) Using /scratch
The /scratch partition has been provided for temporary disk space. It
can be used to upload/download files to and from the net, your account,
or your machine at home. However, this is only for temporary use. It is
not meant to be used as an archive. Files on this partition that
are older than 3 days may be deleted at any time to recover space.
Backups are not made of any of the files on this partition. Anything
lost or deleted from this partition cannot be restored. .
9) Appropriate Use
Accounts granted on UNT machines can only be used for academic
purposes. In particular, UNT accounts, including those on Sol,
cannot be used for conducting official commerce. Sol 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
Because disk storage resources are limited, a quota system is
in place for user storage on Sol. Researchers are granted 20
Megabytes of quota in the /home partition of Sol for
the storage of programs and data. A one-time quota increase to 40
Megabytes is available upon request, if the need arises. Requests
for quota allocations beyond 40 Megabytes can be directed to Dr.
Director of Academic Computing and User Services, along with an estimate
of the amount of allocation needed and the estimated duration of
the need. Allocations will be made on a space-available basis in
the order that they are received.
Return to ACS-Supported UNIX
Return to ACS
This document last updated by: Philip Baczewski