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GC21-7632-5
File No. 53-30
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Preface

T h i s p u b l i c a t i o ns d e s i g n ea sa t u t o r i a la i d f o r I B M S y s -
i d l n o r d e rt o u n d e r s t a ntd e t e x t . t h e r e a d e m u s tb e f a m i l i a r
h r
t e m / 3 M o d e l1 5 s y s t e m p e r a t o r s t c a na l s ob e u s e d sa
o i; a w i t h t h e o p e r a t i o n f t h e S y s t e m / 3 o d e l1 5 o r w i t h a
o M
reference manualfor spooling siupport.In general, pro- the System/3 Model 10 Disk System.tBM System/3 Modet l5
grammeroranalystdoesnotneedtobeconcernedwith l n t r o d u c t i o n , C 2 1 - 5 0 9 4 , d e s c r i b e s M lo d e ln c e p t s .
G 5co
f
s p o o l i n gu n c t i o n s n d o p e r a t i o n s ;o w e v e rw i t h a n u n d e r -
a h , p s
O t h e rr e l a t e d u b l i c a t i o na r e :
s t a n d i n g f s p o o l i n gh e o r s h ec a na l t e rt h e a p p l i c a t i o t o
o , n
achieve optimal results. . tBM System/3Model 15 Operator's
Guide,GC21-5075

Thesetopics are described tl'rispublication:
in . tBM System/3Modet l5 SystemControl programming
ReferenceManual GC21-5077
. (for 5704-SC1)
. Spooling oncepts
c
. l8M System/3 Model l5 System Control Programming
o Processing spooling
with Conceptsand Reference Manual GC21-5162
, (for
5704-SC2)
o P r o c e s s i n g t h o u ts p o o l i n g
wi
. IBM System/3 Model l5 System Generation Reference
o The relationship spooling other system
of to facilities Manual GC2l-7616
.

o OCC (operator
control commands)
usedwith spooling o IBM System/3Modet l5 SystemMessages,
GC21-b076

o S p o o l i n g i m p l i c a t i o n sf o r O C L ( o p e r a t i o nc o n t r o l . IBM System/3 Model 15 3340 Direct AccessStorage
language) Facility Reference
Manual GC21-51 1
, 1

o S p o o l i n gp e r f o r m a n c e o l8M System/33741 Reference
Manual GC21-5113
,
I
o S p o o l i n gp r o b l e m s i t u a t i o n s I o tBM System/3Model 15 MasterIndex,GC2|-52O2
I

Sixth Edition (September
1979)

T h i s i s a m a j o r r e v i s i o n o f , a n d o b s o l e t e s ,G C 2 1 - 7 6 3 2 - 4a n d t e c h n i c a l n e w s l e t t e r
G N 2 1 - 5 6 3 3 . C h a n g e s r a d d i t i o n s t o t h e t e x t a n d i l l u s t r a t i o n sa r e i n d i c a t e d b y a v e r t i c a l
o
l i n e t o t h e l e f t o f t h e c h a n g eo r a d c l i t i o n .

T h i s e d i t i o n a p p l i e st o v e r s i o n 0 7 , m o d i f i c a t i o n 0 O o f t h e I B M S y s t e m / 3 M o d e l 1 5
S y s t e m C o n t r o l P r o g r a m 5 7 0 4 - S Cl ; t o v e r s i o n 0 4 , m o d i f i c a t i o n 0 0 o f t h e I B M S y s t e m / 3
M o d e l 1 5 S y s t e m C o n t r o l P r o g r a m 5 7 O 4 - S C 2 ; n d t o a l l s u b s e q u e n t e r s i o n sa n d
a v
m o d i { i c a t i o n su n t i l o t h e r w i s e i n d i c a t e d i n n e w e d i t i o n s o r t e c h n i c a l n e w s l e t t e r s .

C h a n g e s r e p e r i o d i c a l l y m a d e t o t h e i n f o r m a t i o n h e r e i n ;c h a n g e s i l l b e r e p o r t e d i n
a w
technicalnewsletters r in new editions of this oublication.
o

Use this publication only for the purposes stated in the Preface.

P u b l i c a t i o n sa r e n o t s t o c k e d a t t h e a d d r e s sb e l o w . R e q u e s t sf o r c o p i e so f I B M
p u b l i c a t i o n sa n d f o r t e c h n i c a l i n f o r m a t i o n a b o u t t h e s y s t e m s h o u l d b e m a d e t o y o u r
I B M r e p r e s e n t a t i v e r t o t h e b r a n c h o f f i c e s e r v i n gy o u r l o c a l i t y ,
o

T h i s p u b l i c a t i o n c o u l d c o n t a i n t e c h n i c a l i n a c c u r a c i e s r t y p o g r a p h i c a le r r o r s . A d d r e s s
o
y o u r c o m m e n t s a b o u t t h i s p u b l i c a t i o n t o I B M C o r p o r a t i o n , p u b l i c a t i o n s ,D e p a r t m e n t 2 4 5 ,
R o c h e s t e r ,M i n n e s o t a 5 5 9 0 1 . I B M m a y u s e a n d d i s t r i b u t e a n y o f t h e i n f o r m a t i o n y o u
s u p p l y i n a n y w a y i t b e l i e v e s p p r o p r i a t ew i t h o u t i n c u r r i n g a n y o b l i g a t i o n w h a t e v e r . y o u
a
m a y , o f c o u r s e ,c o n t i n u e t o u s e t h e i n f o r m a t i o n y o u s u p p l y .

@f nternationaBusinessMachinesCorporation 74,1975,1976,1g7j,1g78, 1g7g
l 19
Contents

C H A P T E R1 . I N T R O D U C T I O N CHANGF Copies 5-5
Levels f Support
o t-z F un c t i o n 5-5
C o n c e p t so f S p o o i O p e r a t i o n 1-3 Fo r m a t 5-5
Advanra-cres Spooling.
o{ t-J C o nt e nt s 5-5
U s e rC o n t r o l t-J Considerations 5-5
CHANGE Core 5-6
CHAPTEB 2. PFOCESSING ITH SPOOLING W z-l Fu n c t i o n 5-6
G e n e r a t i n g S p o o l i n gS y s t e m .
a z- | Fo r m a t 5-6
IPL 2-4 Con ter'lts 5-6
Reatling lnput Spooling)
( z-c Considerations 5-6
Job Stream 2-5 CHANGE FormsType 5-7
R e a d e rO u e u e l-o F u n c t io n 5-7
E x e c u t i n gJ c b s 2.10 Format 5-7
l d e n t i l i c a t i o no n t h e O u e u e 2-10 C o nt e nt s 5-7
D e v i c eC o n l e i t t i o n C o n s i d e r a to n s
i 5-7
C o n : ; i d e r ao n s
it l-t3 CHANGE Partition 5-8
O p e r a t o rC o n t r o l 2-13 Function 5-8
P r in t i n g a l A
Fo r m a t 5-8
DEFEROption 2.15 C o nt e n t s 5-8
SpoolFile Securiry 2-16 Considerations 5-8
G r o u p i n qJ o b S t e p s . z- to CHANGE Priority 5-9
RestartinghePrint Writer .
t z- to Functions 5-9
Clranging orms . F z- to Fc J r m a t 5-9
S t a r t i n gt h e P r i n t W r i t e r U s i n ga F o r m s T y p e C o nt e n t s 5-9
FormsAliqnment 2,17 Considerations 5-10
l \ , l u l r i p l eC o p i e s 2-17 DISPLAY 5-11
C h a n g i n gh e P r i n t C h a i n / T r a i n
t 2.18 Funclions 5-11
E r r o r C o ; r r i iilo r r s . 2-1A Fornrat 5-1 1
O p e r a i o rC o n t r o l 2,19 Contents 5-'t1
D i s p l a y i n g h e C u r r e n t P r i n t e dP a g e o u n t
t C z-z I Considerations 5-1 5
Prrntrnghe LaslPages irst
t F z-1 | HIPTY 5-17
S k i 1 . : p i r rB a c k S e v e r a lP a g e s
g F un c l i o n 5-17
P un c hrn g t-z I Format , 5-17
I J E F E RO p t i o n Contents 5-17
S p o o l F r l eS e c u r i t y 2-22 Considerations 5-17
R B s t d r l r l gt t r eP u r r c l W r i t e r
r HOLD 5-18
Readrrrgnd Purrctting ') -t',
a F r tn c t i o n s 5-18
Chanqinq ardIypes C z'zJ Fo r m a t 5-'l8
M u l t i p l eC o p r 0 s 2.23 C o nt e n t s 5-18
ErrorConditions z-zJ Considerations 5-18
O p e r a t o rC o n t r o l o f P u n c hS p o o l i n g z-14 KEEP 5-19
Fun c t i o n 5-19
CHAPTER 3. PROCESSING ITHOUT SPOOLING
W J-l F orfilat $19
Contents 5-19
CHAPTER 4. PROCESSING ITH OTHER SYSTEM
W C c n s id er a t io n s 5-19
FACILITIES 4-1 PTY 5-20
Checkpoint/Restart. 4.1 Fu n c t i o n 5-20
R ol l o u t / R o l i n
i 4-2 Fo r m a t 5-20
Contents +20
CHAPTER 5. OPERATOR CONTROL COMMANDS FOR C o n s i d e r a to n s
i 5-20
SPOOLING 5-1 READER, 5-21
CANCEL. 5-2 F u n c t io n 5-21
Fun c t i o n s 5.2 Format 5-2'l
Format 5-2 C o n t e nt s 5-21
C o nt e nt s 3 1 Considr-'rations 5-21
C o n si d er a t i o n s 5-3 R EL.EASE 5-22
C H A N G T C a r c lT y p e 5-4 Functions 5-22
F u n c t io n 5,4 [: ormat 5-22
Fo r m a t 5,4 (--ontents 5-22
C o nt e nt s .;-4
Considerations 5-22
Consideraons il F A
RESTART 5-23 CHAPTER 7. PERFORMANCE 7.1
Funcrions c- zs P e r i o r m a n c eF a c t o r s 7.1
F o r r n aI s-23 S y s t e mC o n s i d e r a r i o n s 7.1
Conten s t 5-23 A p p l i c a ti o n C o n s r d e r a r r o n s . 7-1
C o n s r d ca l i o n s
r s-23 U s e rP r o g r a mC o n s i d e r a t i o n s 7 _?
REUSE 5-24 O p e r a t i o n a C o n s i d e r ai r n s .
l o t-J
F u n Lt r ( r l ) 5-24
Fo r n r a t 5-24 CHAPTER 8. PROBLEM SITUATIONS. 8-1
C o n| ( ' ni s 5-24 Spool File ls Full 8-1
C o n s r d e r ao tn s
t 5-24 Permanent isk Errors
D 8-1
START 5-25 DeviceFailures 8-1
Functrons. 5-25 Lost Jobsor Job Steps 8-1
Fo r m a i 5-25
C o nt e nt s s-25 CHAPTER 9. SECOND 1403 PRINTER 9-1
C o n s r d e rIao n s
i 5-26 Operator Control Commanos 9-1
STOP , 5-27 O p e r a t r o n aC o n s i d e r a t i o n s
l 9,1
Funclions 5-21 P r i n t O u e u eD i s p l a y. 9,2
Format 5-27 M a i n S t o r a g eR e q u i r e m e n t s 9-2
C o nt e nt s 5-27
Considerations 5-28 APPENDIX A. FORMAT OF THE OUEUES A-1
CHAPTER 6. OCL CONSITIERATIONS. 6-1 APPENDIX B. MAIN STORAGE REOUIREMENTS B-1
A S S IG N b-l
Function 6-1 APPENDIXC. SIZE OF SPOOLAREA . c-1
Placcment tr- I
Fo rm a t 6-1 A P P E N D I X D . S I Z E O F T R A C K G R O U P S. D-1
Fxample 6-1
JOB 6-2 APPENDIX E. SPOOL MESSAGES E.1
F uncilon b-2
Pl a c e m e n t 6-2 APPENDIX F. OPERATOR CONTBOL COMMANDS
Format 6-2 ( O C C }S U M M A R Y , F-1
C o nt e n t s 6-2 I n f o r m a t i o nA b o u t S y n t a x l l l u s t r a t i o n s r-l
C o nsi d er a t i o n s 6-3 OCC List r- I
PRINTER 64
Functiorrs. 6-4 GLOSSARY u l
Pl a c e m e n t 6-4
Fo r m a t 64 INDEX x-1
Contents 6-4
C o n s i d e r ta o n s
i 6-5
PUNCH 6
Functions. 6-6
Placement 6
Formar 6
C o nt e n t s 6
C o ns i r l e a t i o n s
r b- /
READER 6-8
Function 6-8
Placemeni 6-8
Fornrat 6-8
C o nt e n t s b-6
C o n s i d ea t i o n s
r 6-8
6-9
Functions. 6-9
['lacement 6-9
Format 6-9
Corrtent 69
C o ns i d er a t i o n s 6-9
Chapter1. Introduction

S p o o l i n g i s a n o p t i o n a l f a c i l i t y o f t h e s y s t e mc o n t r o l p r o - When directly attached to the Model 15, the 3741 Data
g r a m s ( P r o g r a mN u m b e r s5 7 0 4 - S C 1a n d 5 7 0 4 - S C 2 )f o r Station Model 1 ot 2 ot 3741 Programmable ork Station W
S y s t e m / 3M o d e l 1 5 . M o d e l 3 o r 4 c a n b e u s e d a s t h e s o o o l e di n o u t d e v i c e .
W h e n t h i s o p t i o n i s s e l e c t e d 1 - t h r o u g h 1 2 8 - b y t er e c o r d s
,
I n a d d i t i o nt o t h e m i n i m u m s y s t e n c o n { i g u r a t i o no r
l t c a n b e r e a d . S p o o l i n gw i l l t r u n c a t e ( o n t h e r i g h t ) o r p a d
S y s t e m C o n t r o l P r o g r a m5 7 0 4 S C 1 , s p o o l r e q u i r e s5 4 4 5 w i t h b l a n k s ( o n t h e r i g h t ) t h e 3 7 4 1 r e c o r d st o f i t t h e u s e r
D i s k S t o r a g eM o d e l 1, 2 , o r 3 w h e n u s i n g a S y s t e m / 3 p r o g r a m ' sr e q u e s t e d e n g t h . I n t h i s p u b l i c a t i o n ,r e f e r e n c e s
l
M o d e l 1 5 A . F o r i n f o r n r a t r o n o n c e r n i n gh e m i n r m u m
c t t o c a r d i n p u t a l s oa p p l y t o i n p u t f r o m t h e d i r e c t l y a t t a c h e d
s y s t e mc o n f i g u r a t i o n s o r t h e s y s t e mc o n t r o l p r o g r a m s
f 3741.
( 5 7 0 4 S C 1 a n d 5 7 0 4 - S C 2 ) , e eo n e o f t h e f o l l o w i n g
s
publications: I t i s p o s s i b l e o s p o o l u n i t - r e c o r dd e v i c e su s e d i n a p r o g r a m
t
p a r t i t i o n t h a t i s p e r f o r m i n g t e l e p r o c e s s i no p e r a t i o n s . l t
g
. IBM System/3 Model l5 System Generation Reference i s n o t p o s s i b l e o s p o o l r e a d e r s p u n c h e s ,o r p r i n t e r sa t t a c h e d
t ,
M a n u a l .c C 2 1 7 6 1 6 t o t e r m i n a l st h a t a r e c o n n e c t e dt o t h e s y s t e mu s i n gt h e
b i n a r y s y n c h r o n o u s o m m u n i c a t i o n sa d a p t e r ,m u l t i p l e l i n e
c
. IBM System/3 Model lS lntroduction, cC21-5094 t e r m i n a l a d a p t e r ,o r l o c a l c o m m u n i c a t i o n s d a p t e r .
a

A l t h o u g h p a r t i t i o n 3 ( P 3 ) a n c l3 3 4 4 D i r e c t A c c : e sS t o r a g e
s The IBM Systemi3Model 15 is a two- or three-partition
a r e d i s c u s s e dh r o u g h o u t t h i s m a n u a l ,t h e y a r e s u p p o r t e d
t m u l t i p r o g r a m m i n gs y s t e m . ( S C P5 7 0 4 - S C 1s u p p o r t st w o
o n l y b y S y s t e m C o n t r o i P r o g r a m5 7 0 4 S C 2 . p a r t i t i o n s ;S C P 5 7 0 4 - S C 2s u p p o r t st h r e e p a r t i t i o n s . )
S p o o l i n g ,a n o p t i o n a l f a c i l i t y o f t h e s y s t e mc o n t r o l p r o -
A c o m p a r i s o r o f p o s s i b l e i s k st o r t h e s p o o l f i l e i s q i v e r r
r d g r a m ,c a n i m p r o v e t h e t h r o u g h p u t o f a n a p p l i c a t i o n .
in Figure -1.
1 S y s t e m / 3 M o d e l I 5 o f f e r s a v a r i e t y o f o p e r a t i n ge n v i r o n -
ments:

Spool FileDisk Types
O n e - ,t w o - . o r t h r e e - b a t c hp a r t i t i o n s ,e a c h w i t h o r
3344 Main
without spooling
3340 Main Data Area Data Area

System Control 5 /04 Srl1 5704S;a:2i; i 04 sc2 a C o m b i n a t i o n so f b a t c h a n d c o m m u n i c a t i o n s , a c h w i t h
e
Progrant Nunriri:r or without spooling

P o s s r b lU n r l
c D 1 ,D 2 D 1 ,D 2 D 1 ,D 2 , L , 3 ,D 4 , S p o o l i n gs u p p o r t f o r t h e M o d e l 1 5 f a c i l i t a t e sh a n d l i n g
Cocles D 3 ,D 4 D 3 ,D 4 D3 D31 D31. 32,D u n i t - r e c o r di n p u t a n d o u t p u t a t d i s k l / O s p e e d ,t h e r e b y
D4 D41 D 3 3 ,D 3 4 ,
i n c r e a s i n go t a l s y s t e mt h r o u g h p u t .
t
D 4 1 ,D 4 2 ,
t)43. D44
W i t h s p o o l i n g ,a j o b i s s t o r e d o n d i s k . W h e n t h e p r o c e s s i n g
Maxirnurl Sizi, 186 u n i t b e c o m e sa v a i l a b l e t h e j o b i s t r a n s f e r r e d r o m d i s k t o a
, f
rn Cylinders p r o g r a mp a r t i t i o n . A s t h e j o b e x e c u t e s , t s p r i n t e d a n d / o r
i
p u n c h e do u t p u t i s s t o r e d o n d i s k . U p o n o p e r a t o r r e q u e s t ,
F i g u r e 1 - 1 . C o m p a r i s o no f P o s s i b l eD i s k s f o r t h e S p o o l F i l e t h e o u t p u t m a y b e p r i n t e d a n d / o r p u n c h e dw h i l e o t h e r i o b s
a r e e x e c u t i n g ;t h u s , t h e j o b e x e c u t e s i t h o u t h a v i n gt o w a i t
w

W i t h 5 7 0 4 S C 2 ,t h e s p o o l f i l e c o p v p r o g r a m ( S O C O P Y )c a n f o r t h e s l o w u n i t - r e c o r dd e v i c e s .
b e u s e dt o c o p y e n t r i e st o a n d f r o m t h e s p o o ! q u e u e s . R e f e r
to the IBM Systent/3 Model l5 Sy.sten Control Programming
Concepts and Reference Manttal , GC21 5162, for infornration
about $OCOPY.

Introduction 1- 1
Whenevera spooled reader,card punch, or printer becomes The following unit-record devicescan be spooled:
i n o p e r a t i v e t h e s y s t e mc o n t i n u e sp r o c e s s i n go b s a l r e a d y
, j
o n d i s k . W h e n t h e l / O u n i t b e c o m e s p e r a t i v ea g a i n ,
o o 5424 MFCU
r e a d i n g .p u n c h i n g ,o r p r i n t i n g c o n t i n u e sw i t h o u t a l o s so f
o u t p u t o r p r o c e s s i n gi m e .
t o 2560 MFCM

W i t h s p o o l i n g .p r o g r a m sc a n b e r u n i n d i f f e r e n t p a r t i t i o n s . 1442Card Read punch
without the need for separateunit-record devicesfor each
partition. The printer, for example. can be used by multiple o Directly attached 3741 Data Station/programmableWork
p a r t i t i o n si f i t i s b e i n g s e r v i c e d y t h e s p o o l i n gf u n c t i o n .
b Station (input only)

Performanceof a spooling system varieswidely. In some . 2501 Card Reader
cases, such as applications with short programs or with
s m a l l a m o u n t s o f u n i t - r e c o r dl l O , s p o o l i n gm a y o f f e r l i t t l e o 1403 Printer
o r n o a d v a n t a g e .I n o t h e r c a s e s s u c h a s t h o s e i n w h i c h
.
unit-record device contention is a problem, spooling can The combination of devicesthat can be used with the
p r o v i d e s u b s t a n t i a b e n e f i t si n o v e r a l la p p l i c a t i o n
l d i f f e r e n t l e v e l so f s p o o l i n gs u p p o r t i s s h o w n i n F i g u r e 1 - 2 .
throughput. The user also choosesthe program partitions to be supported
by spooling: partition 1 only, partition 2 only, partition 3
only, or any combinationof partitions.
LEVELS OF SUPPCIRT
This publication assumesthat you have selectedinput,
A u s e r n e e d n o t s p o o l a l l u n i t - r e c o r dl / O a c t i v i t y ; d u r i n g print, and punch spooling.
s y s t e mg e n e r a t i o n , , n eo f t h e f o l l o w i n g f o u r l e v e l s f l / O
o o
support can be selected:

. Print spooling

. Print and punch srpooling

o Input and print s1:ooling

. Input, print, and punch spooling

L E V E LO F S U P P O R T

P r in t P r i nt / P u n c h I nput/Print I nput/Print/Punch
P r in t e r 1403 X X X X X X X X X X X X X X X X X X X
MFCU X X X X X
Punch
MFCM X X X X
Device
14/.2 X X X X X
MFCU X X X
MFCM X X
I nput
1442 X X X
Device
2501 X X X X
3741 X X X X

F i g u r e 1 - 2 . C o m b i n a t i o n o f D e v i c e sA v a i l a b l e f o r D i f f e r e n t L e v e l so f S p o o l i n g S u p p o r t
C O N C E P T SO F S P O O L O P E R A T T O N U S E RC O N T R O L

To handle a system's unit-record l/O without depending on E x e c u t i o n f t h e s p o o l i n gu n c t i o ni s c o n t r o l l e d a i n l yb y
o f m
l/O device speeds,spooling support utilizes disk spaceon the system operatorthroughOCC (operator control com-
5445 Disk Storage or on the main data area of a 3340 Direct mands)but alsoby the systemprogrammer throughOCL
AccessStorage Facility or 3344 Direct AccessStorageas ( o p e r a t i oc o n t r o ll a n g u a g e ) .
n
i n t e r m e d i a t e t o r a g ef o r a r e a sk n o w n a s q u e u e s( s e eF i g u r e
s
1 - 3 ) . n s j o b s t r e a m s( i n c l u d i n go p e r a t i o nc o n t r o l l a n g u a g e The operatorcontrolssystem spooling activity by entering,
s t a t e m e n t s p r o g r a m s . n d d a t a ) f o r t h e i n d i v i d u a lp a r t i -
, a t h r o u g h h e C R T / k e y b o a r d , C Ct o m o n i t o r ,c o n t r o l ,a n d
t O
tions are read, a spooling routine stores each job in the communicate with the spooling routines.Throughoperator
r e a d e rq u e u e ;t h i s r o u t i n e i s c a l l e dt h e r e a d e r . control,the spooled reader and output writerscan start
a n ds t o pi n d e p e n d e n tf p r o g r a m x e c u t i o n .F o r e x a m p l e ,
o e
After a job has been completely read and stored in the read- the operator can hold job input in the reader queuefor
e r q u e u e ,i t i s r e a d yt o b e t r a n s f e r r e d o t h e a p p r o p r i a t e
t execution a latertime, allowingjobs that needmore
at
p a r t i t i o n f o r e x e c u t i o n . A l l r e c o r d sa p p e a rt o t h e p a r t i t i o n e x e c u t i o ni m e t o b e h e l du n t i l t h e s y s t e ms l e s s c c u p i e d .
t i o
a s t h o u g h t h e y w e r e j u s t r e a d f r o m t h e p h y s i c a li n p u t d e v i c e . Or, the operator can hold iob output in the punchand
W h e n a l l j o b s t e p si n t h e j o b h a v e b e e n e x e c u t e d ,t h e s p o o l - p r i n t q u e u e s n t i l i t i s c o n v e n i e n t p u n c ho r p r i n t i t .
u to
i n g s u p p o r t r e m o v e s h e j o b f r o m t h e r e a d e rq u e u e .
t
The systemprogrammer makeefficientuseof the sys-
can
P r i n t e da n d p u n c h e d o u t p u t i s a l s o s t o r e d t e m p o r a r i l y o n t e m i n d e f i n i n g h e j o b sa n d s u p p l y i n g C L f o r e a c hj o b .
t O
d i s k i n q u e u e s . S p o o l i n gr o u t i n e sc a l l e dt h e p r i n t w r i t e r F o r e x a m p l ei,f o n e j o b ( D ) s p o o l s l a r g e o l u m e f p r i n t
a v o
a n d p u n c h w r i t e r e n a b l ep r i n t i n g a n d / o r p u n c h i n go f t h e and/orpunchoutput, it is advantageous complete to that
d a t a i n t h e p r i n t q u e u ea n d p u n c h q u e u e u p o n o p e r a t o r job beforeexecuting series processing-oriented
a of jobs
r e q u e s t( s e eF i g u r e s1 - 4 a n d 1 - 5 ) . (A,B,C):

Job Characteristics
ADVANTAGES OF SPOOLING
A Processing-oriented
T h e p r e c e d i n g o n c e p t so f s p o o l i n go p e r a t i o n p o i n t o u t
c B Processing-oriented
these advantages spool support:
of C Processing-oriented
D l/O oriented
a A s y n c h r o n o u so p e r a t i o n

lf the output writersarestarted while the processing'
o l m p r o v e d s y s t e mp e r f o r m a n c e orientedlobs areexecuting, processing and the
the unit
l / O d e v i c ec a n b e u s e ds i m u l t a n e o u s l v .
s
o R e d u c e dd e v i c ec o n t e n t i o n

A n e x a m p l e f O C L s p o o l i n g o n t r o li s t h e D E F E R - N O
o c
Asynchronous operation. Readingthe input records from p a r a m e t e rn t h e P R I N T E Ra n d P U N C Hs t a t e m e n t sW h e n
o .
t h e s p o o l e d r e a d e rt o d i s k , p r i n t i n g t h e s p o o l e d p r i n t r e - programmer
the system includes this statement, the
c o r d s o n t h e p r i n t e r , a n d p u n c h i n gt h e s p o o l e dp u n c h
operatorcan start the print or punchwriter while the job
r e c o r d so n t h e c a r d p u n c h a r e f u n c t i o n s o f s p o o l i n gt h a t
stepproducing output is still executing.
the
o c c u r i n d e p e n d e n t l yo f p r o g r a m se x e c u t i n gi n t h e p a r t i t i o n s .

lmproved system performance. The execution time of any
one job is likely to be decreasedbecauseunit-record oper-
a t i o n s a r e p e r f o r m e d a t d i s k l / O s p e e d s .S p o o l i n gw r i t e s
b l o c k e d i n p u t a n d o u t p u t r e c o r d so n d i s k , f u r t h e r I n c r e a s -
i n g s y s t e mt h r o u g h p u t b e c a u s e h e n u m b e r o f d i s k l / O
t
o p e r a t i o n si s l e s st h a n t h e e q u i v a l e n tn u m b e r o f u n i t - r e c o r d
o o e r a ti o n s ,

Reduced device contenfiol,. Becausemore than one oarti-
t i o n c a n r e f e r e n c e h e s a m ed e v i c ea t t h e s a m et i m e , o n e
t
partition does not have to wait for the other partitions to
free the device.

lntroduction 1-3
Punch ueue
Q
Spool and
P r i n tO u e u e

Spool

Disk
Data
Fi l e s

f y ' o f e ; U s e r f i l e s o n d i s k a n d m a g n e t i ct a p e sa r e n o t h a n d l e d b y t h e s p o o l i n gf u n c t i o n .

Figure1-3. Processing
with Spooling

The JOB statement is read from the spooled reader and
q u e u e do n t h e d i s k b e f o r e t h e s t a r t o f a j o b . S i m i l a r l y ,t h e
j o b o u t p u t i s s t o r e do n t h e d i s k i n p u n c h a n d / o r p r i n t
q u e u e s ;p u n c h i n ga n d p r i n t i n g o c c u r sl a t e r .

N o t e : A s i n g l ed i s k c o n t a i n st h e r e a d e r ,p r i n t , a n d p u n c h
queues.

't4
Spooling
R ou t i n e s

Partition'l
Spool Reader
( d e s i g n a t e d st h e
a
Spool File
spool Input device P a r t i t i o n2
during system
generation)
P a r t i t i o n3

J o b s a r e r e a d b y t h e s p o o l r e a d e ra n d s t o r e d o n d i s k .

Partition1

P a r t i t i o n2

Partition
3

Jobs are transferred from the reader queue to one of
t h e p a r t i t i o n s ,a s r e q u i r e d .

Figure1-4. Spooling
Operation

lntroduction 1-5
Supervisor

Reader
Spooling Oueue
Routines P r in t
Orrerr

Partition1 Punch
Oueue

P a r t i t i o n2 Spool File

Partition
3

A s t h e j o b s a r e e x e c u t e di n t h e p a r t i t i o n s ,t h e i r o u t p u t
is storedin the spool file.

Partition
2

Partition
3

J o b o u t p u t i s p u n c h e do r p r i n t e d a t a l a t e r t i m e , i n d e .
p e n d e n t o f j o b s c u r r e n t l y e x e c u t i n gi n t h e p a r t i t i o n s .

Figure1.5. Spooling
Operation
Chapter 2. Processing
with Spooling

This chaptercovers followingspooling
the topics: T h e l e v e l f s p o o ls u p p o r t e t e r m i n ew h i c h u n i t - r e c o r d
o d s
d e v i c ec a nb e s p o o l e d . h e s e l e c t e ld v e l a na p p l yt o
s T e c
. Generating spooling
a system p a r t i t i o n1 , p a r t i t i o n2 , p a r t i t i o n , o r a n y c o m b i n a t i o n f
3 o
p a r t i t i o n s .l f i n p u t s p o o l i n gs c h o s e n u r i n gs y s t e m e n e r a
i d g
o I P L ( i n i t i a lp r o g r a mo a d )
l t i o n , o n e o f t h e f o l l o w i n g n p u t d e v i c e m u s tb e s e l e c t ea s
i s d
t h e d e v i c er o m w h i c hs p o o l e dn p u tw i l l b e r e a d :
f i
o R e a d i n gi n p u ts p o o l i n g )
(
M F C U l ( M F C Up r i m a r y o p p e r )
h
a Job execution M F C U 2( M F C Us e c o n d a r yo p p e r )
h
1442
o Printing M F C M l ( M F C Mp r i m a r y o p p e r )
h
M F C M 2( M F C M e c o n d a r yo p p e r )
s h
o Punching 2501
3741(directly ttached)
a

GENERATING SPOOLING YSTEM
A S l f p u n c hs p o o l i n gs c h o s e n u r i n gs y s t e m e n e r a t i o n ,n e
g
i d o
o f t h e f o l l o w i n gp u n c hd e v i c e m u s tb e s e l e c t e a st h e
s d
D u r i n g y s t e m e n e r a t i o nh e u s e rc h o o s ets e s p o o l i n g
s g t. h d e v i c e n w h i c hs p o o l e d u t p u t w i l l b e p u n c h e d :
o o
supportneeded according theseto considerations:
M F C U l ( M F C UP r i m a r Y o p p e r )
h
A m o u n to f m a i ns t o r a g e v a i l a b l e
a M F C U 2( M F C Us e c o n d a rh o p p e r )
y
Diskspace available 1442
Jobstream haracteristics
c M F C M 1( M F C Mp r i m a r yh o p p e r )
D e s i r e dh r o u g h p u t
t M F C M 2( M F C Ms e c o n d a rh o p p e r )
y

f o s c
O n eo f t h e f o l l o w i n g o u r l e v e l s f s p o o l i n g u p p o r t a n T h e 1 4 0 3p r i n t e ri s a l w a y s u p p o r t e d h e n e v es p o o l i n gs
s w r i
b e s e l e c t ed u r i n gs y s t e m e n e r a t i o n :
d g s p e c i f i e d .n d i t i s t h e o n l y
a p r i n t e rt h a t c a nb e s p o o l e d .F o r
5 7 0 4 - S Co n l y , a n a d d i t i o n a1 4 0 3p r i n t e rc a nb e s e l e c t e d
2 l
P r i n ts p o o l i n g d u r i n gs y s t e m e n e r a t i oa n d u s e db y a s e c o n d p o o lp r i n t
g n s
P r i n ta n d p u n c hs p o o l i n g w r i t