.s1
9. Statistics
.es
The following numbers
are presented to suggest the scale of our operation.
Those of our users
not involved in document preparation
tend to use the system for
program development, especially language work.
There are few important
``applications'' programs.
.pg
Overall, we have
.pg
.ta .5i 1.25i
.ti 0
.nf
	100	user population
	14	maximum simultaneous users
	380	directories
	4800	files
	66300	512-byte secondary storage blocks used
.fi
.pg
There is a ``background'' process that
runs at the lowest possible priority; it is used
to soak up any idle \*sCPU\*n time.
It has been used to produce a million-digit
approximation to the constant \fIe\fR\(mi2,
and is now solving all rook-and-pawn vs. rook chess
endgames.
Not counting this background work, we average daily
.pg
.nf
.ti 0
	2400	commands
	5.5	\*sCPU\*n hours
	100	connect hours
	32	different users
	100	logins
.fi
.pg
.pg
.ti 0
.ft I
Acknowledgements.
.ft R
We are grateful to R.H. Canaday, L.L. Cherry,
and L.E. McMahon
for their contributions to
\*sUNIX\*n.
We are particularly appreciative
of the inventiveness,
thoughtful criticism,
and constant support of
R. Morris, M.D. McIlroy,
and J.F. Ossanna.
.pg
.pg
.ti 0
.ft B
References
.ft R
.br
.in 3
.ta 3
.nr r 0 1
.ti 0
\n+r.	Digital Equipment Corporation.
.ft I
\*sPDP\*n-11/40 Processor Handbook \fR(1972),
.ft R
.ft I
\*sPDP\*n-11/45 Processor Handbook \fR(1971),
.ft R
and
.ft I
\*sPDP\*n-11/70 Processor Handbook \fR(1975).
.br
.ti 0
\n+r.	Deutsch, L.P., and Lampson, B.W.
An online editor.
.ft I
Comm. ACM 10,
.ft R
12 (Dec. 1967),
793-799, 803.
.br
.ti 0
\n+r.	Richards, M.
\*sBCPL\*n: A tool for compiler writing
and system programming.
Proc. AFIPS 1969 SJCC, Vol. 34,
AFIPS Press, Montvale, N.J., pp. 557-566.
.br
.ti 0
\n+r.	McClure, R.M.
\*sTMG\*n\(emA syntax directed compiler.
Proc. ACM 20th Nat. Conf.,
ACM, 1965, New York,
pp. 262-274.
.br
.ti 0
\n+r.	Hall, A.D.
The M6 macroprocessor.
Computing Science Tech. Rep. #2,
Bell Telephone Laboratories,
1969.
.br
.ti 0
\n+r.	Ritchie, D.M.  C reference manual. Unpublished memorandum,
Bell Telephone Laboratories (1973).
.br
.ti 0
\n+r.	Aleph-null. Computer Recreations.
.ft I
Software Practice and Experience 1, \fR2
(Apr.-June 1971), 201-204.
.br
.ti 0
\n+r.	Deutch, L.P. and Lampson, B.W.
\*sSDS\*n 930 time-sharing system
preliminary reference manual.
Doc. 30.10.10, Project \*sGENIE\*n,
Univ. Cal. at Berkeley (Apr. 1965).
.br
.ti 0
\n+r.	Feiertag, R.J., and Organick, E.I.
The Multics input-output system.
Proc. Third Symposium on Operating Systems Principles.
Oct. 18-20, 1971,
ACM, New York, pp. 35-41.
.br
.ti 0
\n+r.	Bobrow, D.G., Burchfiel, J.D., Murphy, D.L., and
Tomlinson, R.S.
\*sTENEX\*n, a paged time sharing system for the \*sPDP\*n-10.
.ft I
Comm. ACM 15.,
.ft R
3 (March 1972) 135-143.