Control Data 3170 Installation Handbook page 298

MASS STORAGE REQUIREMENT TABLE
The following is a guide to determine which library options are most efficient for the
space occupied on the system disk. For safety, one sector has been added to all
equations. Remainders of calculated values are ignored. PRE LIB creates system
files blocked according to sector size. Calculations using the following equations are
therefore relative to sectors.
11.1 MASS STORAGE REQUIREMENT TABLE (MSRT) EQUATIONS
11
The following equations are dependent upon the type of library program being considered.
The appropriate equation determines the number of sectors occupied.
11.1.1 ABSFILE OCCUPATION
sectors
=
(
program length - decrement
+
1 )
words per sector
The decrement is indicated by the I parameter on an ORIGIN card.
Example of routine ALGI follows:
Sector size
Program length
Decrement
sectors
64 words (853 specification)
10701 8
74 8
(
107018 - 74 8
+
1 )
100 8
71 sectors
11.1.2 LlBFILE OCCUPATION
sectors
=
( number of binar
Y 6
cards in program
+
1) (
240
+
1)
sector size
The number of binary cards in a program includes LED, overlay, LRL, EXS, and
BCT cards.
Example of routine PLOVINT follows:
Sector size
Number of cards
64 words
(853
specification)
40
sectors
=
(46
0
+
1)
(2:2
+
1)
35 sectors
60410800 A
Ill-ll-1