IBM 1130 User Manual page 664

Section
Subsections Page
90 20
I
30 03
record then call a LOCAL or SOCAL subprogram,
the entire purpose of the FIND will liave been
negated, and you will wind up increasing disk seek
time rather than decreasing it. If you know you
Without the FIND statement:
READ
•
Compute
will have LOCALs or SOCALs, you may want to
remove all the FIND statements from your program,
eliminating the SDFND subroutine, which is approx-
imately 80 words long.
Other
Read
Coding
Location Arm Movement
Record
Continue
of Record
I---
300 m,,<
----.~~I
. . . . .
I - - X -...
~ I I o I
. . . .
- - - - - - - 7 0 0
msec
Total time
=
700
+
300
+
X
+
Y
X is small compared with the others.
With the FIND statement:
READ
F
IND
,
..
700
msec
-
I
,
Compute Arm Movement Compute
Read
Location
I
Location
Record
of Record Other Coding of Record
x
x y
Total time
=
700
+
X
+
X
+
Y
X is small compared with the others.
Figure 90.9.