IBM System/3 Model 15
User's Guide to Spooling
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 n i s d e s i g n e d a s a t u t o r i a l a i d fo r I B M S y s - l n o r d e r to u n d e r s t a n d t h e t e x t . th e r e a d e r m u s t b e fa m i l i a r t e m / 3 M o d e l 1 5 s y s t e m o p e r a t o r s ; i t c a n a l s o b e u s e d a s a w i t h t h e o p e r a t i o n o f t h e S y s t e m / 3 M o d e l 1 5 o r w i t h a reference manual for spooling siupport. In general, the pro- System/3 Model 10 Disk System. tBM System/3 Modet l5 g r a m m e r o r a n a l y s t d o e s n o t n e e d t o b e c o n c e r n e d w i t h l n t r o d u c t i o n , G C 2 1 - 5 0 9 4 , d e s c r i b e s M o d e l l 5 c o n c e p t s . s p o o l i n g f u n c t i o n s a n d o p e r a t i o n s ; h o w e v e r , w i t h a n u n d e r - O t h e r re l a t e d p u b l i c a t i o n s a r e :
s t a n d i n g o f s p o o l i n g , h e o r s h e c a n a l t e r t h e a p p l i c a t i o n t o
achieve optimal results. . tBM System/3 Model 15 Operator's Guide, GC21-5075
These topics are described in tl'ris publication: . tBM System/3 Modet l5 System Control programming Reference Manual . GC21-5077 (for 5704-SC1) . S p o o l i n g c o n c e p t s
. l8M System/3 Model l5 System Control Programming
o Processing with spooling Conceptsand Reference Manual , GC21-5162 (for
5704-SC2) o P r o c e s s i n g w i t h o u t s p o o l i n g
. IBM System/3 Model l5 System Generation Reference o The relationship of spooling to other system facilities Manual . GC2l-7616
o OCC (operator control commands) used with spooling o IBM System/3 Modet l5 System Messages, GC21-b076 o S p o o l i n g im p l i c a t i o n s fo r O C L ( o p e r a t i o n c o n t r o l
language)
o S p o o l i n g p e r f o r m a n c e o S p o o l i n g p r o b l e m s i t u a t i o n s
. IBM System/3 Model 1 5 3340 Direct Access Storage Facility Reference Manual , GC21-51 1 1
o l8M System/3 3741 Reference Manual , GC21-5113
I
I o tBM System/3 Model 15 Master Index,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 - 4 a 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 o 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 s a r e i n d i c a t e d b y a v e r t i c a l l i n e t o t h e l e f t o f t h e c h a n g e o 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 s to v e r s i o n 0 7 , modification 0O of the IBM System/3 Model 15 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 C l; to version 04, modification 00 of the IBM System/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 ; a n d t o a l l s u b s e q u e n t v e r s i o n s a n d m o d i { i c a t i o n s u n t i l o t h e r w i s e in d i c a t e d in new editions or technical newsletters.
C h a n g e s a 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 ; changes w i l l b e r e p o r t e d i n t e c h n i c a l n e w s l e t t e r s o r i n n e w e d i t i o n s o f t h i s o u b l i c a t i o n .
Use this publication only for the purposes stated in the Preface.
P u b l i c a t i o n s a r e n o t s t o c k e d a t t h e a d d r e s s b e l o w . R e q u e s t s f o r c o p i e s o f I B M p u b l i c a t i o n s and for technical information about the system should be made to your I B M r e p r e s e n t a t i v e o r t o t h e b r a n c h o f f i c e s e r v i n g y o u r locality,
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 inaccuracies o r t y p o g r a p h i c a l e r r o r s . A d d r e s s y o u r comments about this publication to IBM Corporation, publications, Department 245, 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 and distribute any of the information you s u p p l y i n a n y w a y i t b e l i e v e s a p p r o p r i a t e w 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 m a y , o f c o u r s e , c o n t i n u e t o u s e the information you supply.
@ f n t e r n a t i o n a l B u s i n e s s M a c h i n e s C o r p o r a t i o n 1 9 7 4 , 1 9 7 5 , 1 9 7 6 , 1 g 7 j , 1 g 7 8 , 1 g 7 g
Contents
C H A P T E R 1 . I N T R O D U C T I O N L e v e l s o f S u p p o r t
C o n c e p t s o f S p o o i O p e r a t i o n A d v a n r a - c r e s o { S p o o l i n g . U s e r C o n t r o l
C H A P T E B 2 . P F O C E S S I N G W I T H S P O O L I N G G e n e r a t i n g a S p o o l i n g S y s t e m .
I P L
R e a t l i n g ( l n p u t S p o o l i n g ) J o b S t r e a m
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C o n : ; i d e r a t i o n s O p e r a t o r C o n t r o l P r i n ti n g
D E F E R O p t i o n S p o o l F i l e S e c u r i r y G r o u p i n q J o b S t e p s . R e s t a r t i n g t h e P r i n t W r i t e r . C l r a n g i n g F o r m s .
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S k i 1 . : p i r r g B a c k S e v e r a l P a g e s P u n c h r n g
I J E F E R O p t i o n S p o o l F r l e S e c u r i t y R B s t d r l r l g t t r e P u r r c l r W r i t e r R e a d r r r g a n d P u r r c t t i n g C h a n q i n q C a r d I y p e s M u l t i p l e C o p r 0 s E r r o r C o n d i t i o n s
O p e r a t o r C o n t r o l o f P u n c h S p o o l i n g
C H A P T E R 3 . P R O C E S S I N G W I T H O U T S P O O L I N G C H A P T E R 4 . P R O C E S S I N G W I T H O T H E R S Y S T E M
F A C I L I T I E S C h e c k p o i n t / R e s t a r t . R o ll o u t / R o i l i n
C H A P T E R 5 . O P E R A T O R C O N T R O L C O M M A N D S F O R S P O O L I N G
C A N C E L . F u n c t i o n s F o r m a t C o n te n ts C o n s i d e ra t i o n s C H A N G T C a r c l T y p e
F u n c t i o n F o r m a t C o n te n ts C o n s i d e r a l i o n s
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F u n c t i o n F o r m a t Con ter'lts C o n s i d e r a t i o n s C H A N G E F o r m s T y p e
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C H A P T E R 7 . P E R F O R M A N C E P e r i o r m a n c e F a c t o r s
S y s t e m C o n s i d e r a r i o n s A p p l i c a t i o n C o n s r d e r a r r o n s . U s e r P r o g r a m C o n s i d e r a t i o n s O p e r a t i o n a l C o n s i d e r a r i o n s .
C H A P T E R 8 . P R O B L E M S I T U A T I O N S . S p o o l F i l e l s F u l l
P e r m a n e n t D i s k E r r o r s D e v i c e F a i l u r e s L o s t J o b s o r J o b S t e p s
C H A P T E R 9 . S E C O N D 1 4 0 3 P R I N T E R O p e r a t o r C o n t r o l Commanos
O p e r a t r o n a l C o n s i d e r a t i o n s P r i n t O u e u e D i s p l a y . M a i n S t o r a g e R e q u i r e m e n t s
A P P E N D I X A . F O R M A T O F T H E O U E U E S A P P E N D I X B . M A I N S T O R A G E R E O U I R E M E N T S A P P E N D I X C . S I Z E O F S P O O L A R E A .
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 . A P P E N D I X E . S P O O L M E S S A G E S
A P P E N D I X F . O P E R A T O R C O N T B O L C O M M A N D S ( O C C } S U M M A R Y ,
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F u n c t i o n s . P l a c e m e n t F o r m a r C o n te n ts C o n s i r l e r a t io n s R E A D E R
F u n c t i o n P l a c e m e n i F o r n r a t C o n te n ts C o n s i d e r a t i o n s F u n c t i o n s . [ ' l a c e m e n t F o r m a t C o r r t e n t C o n s i d e r a t io n s
S p o o l i n g is 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 m c o n t r o l p r o - g r a m s ( P r o g r a m N u m b e r s 5 7 0 4 - S C 1 a n d 5 7 0 4 - S C 2 ) fo r S y s t e m / 3 M o d e l 1 5 .
I n a d d i t i o n t o t h e m i n i m u m s y s t e n l c o n { i g u r a t i o n t o r 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 C 1 , s p o o l r e q u i r e s 5 4 4 5 D i s k S t o r a g e M 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 M o d e l 1 5 A . F o r i n f o r n r a t r o n c o n c e r n i n g t h e m i n r m u m s y s t e m c o n f i g u r a t i o n s f o r t h e s y s t e m c o n t r o l p r o g r a m s ( 5 7 0 4 S C 1 a n d 5 7 0 4 - S C 2 ) , s e e o n e o f t h e f o l l o w i n g p u b l i c a t i o n s :
. IBM System/3 Model l5 System Generation Reference M a n u a l . c C 2 1 7 6 1 6
. IBM System/3 Model lS lntroduction, cC21-5094 A l t h o u g h p a r t i t i o n 3 ( P 3 ) a n c l 3 3 4 4 D i r e c t A c c : e s s S t o r a g e a r e d i s c u s s e d t h r o u g h o u t t h i s m a n u a l , th e y a r e s u p p o r t e d 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 m 5 7 0 4 S C 2 .
A c o m p a r i s o r r o f p o s s i b l e d i s k s to r t h e s p o o l f i l e i s q i v e r r i n F i g u r e 1 - 1 .
5704 S;a:2i; i 04 sc2
L , 3 , D 4 , D 3 1 . D 3 2 , D 3 3 , D 3 4 , D 4 1 , D 4 2 , t)43. D44 1 8 6
F i g u r e 1 - 1 . C o m p a r i s o n o f P o s s i b l e D i s k s f o r t h e S p o o l F i l e
W i t h 5 7 0 4 S C 2 , th 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 b e u s e d to c o p y e n t r i e s t 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 a b o u t $ O C O P Y .
C h a p t e r 1 . I n t r o d u c t i o n
When directly attached to the Model 15, the 3741 Data S t a t i o n M o d e l 1 o t 2 o t 3 7 4 1 P r o g r a m m a b l e W o r k S t a t i o n 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 d in o u t d e v i c e . W h e n th 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 e re c o r d s c a n b e r e a d . S p o o l i n g w 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 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 s t o f i t t h e u s e r p r o g r a m ' s r e q u e s t e d l e n g t h . I n t h i s p u b l i c a t i o n , re f e r e n c e s t o c a r d i n p u t a l s o a 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 3 7 4 1 .
I t i s p o s s i b l e t o s p o o l u n i t - r e c o r d d e v i c e s u s e d in a p r o g r a m 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 te l e p r o c e s s i n g o p e r a t i o n s . l t i s n o t p o s s i b l e t 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 s a t t a c h e d t o t e r m i n a l s t h a t a r e c o n n e c t e d t o t h e s y s t e m u s i n g th e b i n a r y s y n c h r o n o u s c o m m u n i c a t i o n s a d a p t e r , m u l t i p l e l i n e 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 a d a p t e r . T h e I B M S y s t e m i 3 M o d e l 1 5 i s a t w o - o r t h r e e - p a r t i t i o n m u l t i p r o g r a m m i n g s y s t e m . ( S C P 5 7 0 4 - S C 1 s u p p o r t s t w o p a r t i t i o n s ; S C P 5 7 0 4 - S C 2 s u p p o r t s t 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 m c o n t r o l p r o - g r a m , c a n i m p r o v e th 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 . 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 g e n v i r o n - m e n t s :
O n e - , tw o - . o r t h r e e - b a t c h p a r t i t i o n s , e a c h w i t h o r w i t h o u t s p o o l i n g
C o m b i n a t i o n s o f b a t c h a n d c o m m u n i c a t i o n s , e a c h w i t h o r w i t h o u t s p o o l i n g
S p o o l i n g s 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 s h a n d l i n g u n i t - r e c o r d i 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 i n c r e a s i n g t o t a l s y s t e m th r o u g h p u t .
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 u n i t b e c o m e s a 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 f r o m d i s k t o a p r o g r a m p a r t i t i o n . A s t h e j o b e x e c u t e s , i t s p r i n t e d a n d / o r p u n c h e d o 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 , 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 d w 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 w i t h o u t h a v i n g to w a i t f o r t h e s l o w u n i t - r e c o r d d e v i c e s .
a
D 1 , D 2 , D 3 D 3 1 D 4 D 4 1 S p o o l F i l e D i s k T y p e s
3 3 4 0 M a i n D a t a A r e a
3 3 4 4 M a i n D a t a A r e a S y s t e m C o n t r o l
P r o g r a n t N u n r i r i : r P o s s r b l c U n r l Cocles
M a x i r n u r l S i z i , r n C y l i n d e r s
D 1 , D 2 D 3 , D 4
5 / 0 4 S r l 1
D 1 , D 2 D 3 , D 4
I n t r o d u c t i o n 1 -1
Whenever a spooled reader, card punch, or printer becomes The following unit-record devices can be spooled:
i n o p e r a t i v e , t h e s y s t e m c o n t i n u e s p r o c e s s i n g j o b s a l r e a d y
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 o p e r a t i v e a g a i n , o 5 4 2 4 M F C U 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 s w i t h o u t a l o s s o f
o u t p u t o r p r o c e s s i n g t i m e . o 2 5 6 0 M F C M
W i t h s p o o l i n g . p r o g r a m s c 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 . 1 4 4 2 C a r d R e a d p u n c h without the need for separate unit-record devices for each
partition. The printer, for example. can be used by multiple o Directly attached 3741 Data Station/programmable Work
p a r t i t i o n s if i t i s b e i n g s e r v i c e d b y t h e s p o o l i n g fu n c t i o n . S t a t i o n ( i n p u t o n l y )
Performance of a spooling system varies widely. 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 d ll O , s p o o l i n g m a y o f f e r l i t t l e o 1 4 0 3 P r i n t e r o r n o a d v a n t a g e . In o t h e r c a s e s . s u c h a s th o s e in w h i c h
unit-record device contention is a problem, spooling can The combination of devices that can be used with the
p r o v i d e s u b s t a n t i a l b e n e f i t s in o v e r a l l a p p l i c a t i o n d i f f e r e n t le v e l s o f s p o o l i n g s u p p o r t is s h o w n i n F i g u r e 1 - 2 .
throughput. The user also chooses the program partitions to be supported
by spooling: partition 1 only, partition 2 only, partition 3 o n l y , o r a n y c o m b i n a t i o n o f p a r t i t i o n s .
L E V E L S O F S U P P C I R T
This publication assumes that you have selected input, 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 d l/ O a c t i v i t y ; d u r i n g p r i n t , a n d p u n c h s p o o l i n g .
s y s t e m g e n e r a t i o n , o , n e o f t h e f o l l o w i n g f o u r l e v e l s o f l / O support can be selected:
. P r i n t s p o o l i n g
. P r i n t a n d p u n c h s r p o o l i n g o I n p u t a n d p r i n t s 1 : o o l i n g . I n p u t , p r i n t , a n d p u n c h s p o o l i n g
L E V E L O F S U P P O R T
P r i n t P r i n t/ P u n c h I nput/Print I nput/Print/Punch
P r i n t e r 1 403 X X X X X X X X X X X X X X X X X X X
P u n c h D e v i c e
M F C U X X X X X
M F C M X X X X
14/.2 X X X X X
I nput Device
M F C U X X X
M F C M X X
1442 X X X
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 s A v a i l a b l e fo r D i f f e r e n t L e v e l s o f S p o o l i n g S u p p o r t
C O N C E P T S O F S P O O L O P E R A T T O N
To handle a system's unit-record l/O without depending on l/O device speeds, spooling support utilizes disk space on 5445 Disk Storage or on the main data area of a 3340 Direct Access Storage Facility or 3344 Direct Access Storage as i n t e r m e d i a t e s t o r a g e f o r a r e a s k n o w n a s q u e u e s (s e e F i g u r e 1 - 3 ) . n s j o b s t r e a m s ( i n c l u d i n g o p e r a t i o n c o n t r o l l a n g u a g e s t a t e m e n t s , p r o g r a m s . a n d d a t a ) f o r t h e i n d i v i d u a l p a r t i - tions are read, a spooling routine stores each job in the r e a d e r q u e u e ; th i s r o u t i n e i s c a l l e d th e r e a d e r .
After a job has been completely read and stored in the read- e r q u e u e , it i s r e a d y to b e t r a n s f e r r e d t o t h e a p p r o p r i a t e 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 s a p p e a r to t h e p a r t i t i o n a s th o u g h t h e y w e r e ju s t r e a d fr o m t h e p h y s i c a l in p u t d e v i c e . W h e n a l l j o b s t e p s in t h e j o b h a v e b e e n e x e c u t e d , th e s p o o l - i n g s u p p o r t r e m o v e s t h e j o b f r o m t h e r e a d e r q u e u e . P r i n t e d a 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 te m p o r a r i l y o n d i s k i n q u e u e s . S p o o l i n g ro u t i n e s c a l l e d th e p r i n t w r i t e r a n d p u n c h w r i t e r e n a b l e p r i n t i n g a n d / o r p u n c h i n g o f t h e d a t a i n t h e p r i n t q u e u e a n d p u n c h q u e u e u p o n o p e r a t o r r e q u e s t (s e e F i g u r e s 1 - 4 a n d 1 - 5 ) .
A D V A N T A G E S O F S P O O L I N G
T h e p r e c e d i n g c o n c e p t s o f s p o o l i n g o p e r a t i o n p o i n t o u t these advantages of spool support:
a A s y n c h r o n o u s o p e r a t i o n o l m p r o v e d s y s t e m p e r f o r m a n c e o R e d u c e d d e v i c e c o n t e n t i o n
Asynchronous operation. Reading the input records from t h e s p o o l e d r e a d e r t 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 - 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 g th e s p o o l e d p u n c h r e c o r d s o 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 g th a t o c c u r i n d e p e n d e n t l y o f p r o g r a m s e x e c u t i n g in 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 decreased because unit-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 g w 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 s o 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 m th r o u g h p u t b e c a u s e t h e n u m b e r o f d i s k l / O o p e r a t i o n s i s l e s s t h a n t h e e q u i v a l e n t n u m b e r o f u n i t - r e c o r d o o e r a t i o n s ,
Reduced device contenfiol,. Because more than one oarti- t i o n c a n r e f e r e n c e t h e s a m e d e v i c e a t t h e s a m e ti m e , o n e partition does not have to wait for the other partitions to f r e e t h e d e v i c e .
U S E R C O N T R O L
E x e c u t i o n o f t h e s p o o l i n g f u n c t i o n i s c o n t r o l l e d m a i n l y b y the system operator through OCC (operator control com- mands) but also by the system programmer through OCL ( o p e r a t i o n c o n t r o l la n g u a g e ) .
The operator controls system spooling activity by entering, t h r o u g h t h e C R T / k e y b o a r d , O C C t o m o n i t o r , c o n t r o l , a n d communicate with the spooling routines. Through operator control, the spooled reader and output writers can start a n d s t o p in d e p e n d e n t o f p r o g r a m e x e c u t i o n . F o r e x a m p l e , the operator can hold job input in the reader queue for execution at a later time, allowing jobs that need more e x e c u t i o n t i m e to b e h e l d u n t i l t h e s y s t e m i s le s s o c c u p i e d . Or, the operator can hold iob output in the punch and p r i n t q u e u e s u n t i l it i s c o n v e n i e n t t o p u n c h o r p r i n t it . The system programmer can make efficient use of the sys- t e m in d e f i n i n g t h e jo b s a n d s u p p l y i n g O C L fo r e a c h j o b . F o r e x a m p l e , i f o n e jo b ( D ) s p o o l s a l a r g e v o l u m e o f p r i n t and/or punch output, it is advantageous to complete that job before executing a series of processing-oriented jobs
( A , B , C ) :
Job Characteristics
A P r o c e s s i n g - o r i e n t e d B P r o c e s s i n g - o r i e n t e d
C Processing-oriented
D l / O o r i e n t e d
lf the output writers are started while the processing' oriented lobs are executing, the processing unit and the l / O d e v i c e s c a n b e u s e d s i m u l t a n e o u s l v .
A n e x a m p l e o f O C L s p o o l i n g c o n t r o l is th e D E F E R - N O p a r a m e t e r o n t h e P R I N T E R a n d P U N C H s t a t e m e n t s . W h e n the system programmer includes this statement, the
operator can start the print or punch writer while the job step producing the output is still executing.
l n t r o d u c t i o n 1 - 3
Spool
Spool P u n c h Q u e u e
a n d P r i n t O u e u e
D i s k Data F il e s
f y ' o f e ; U s e r fi l e s o n d i s k a n d m a g n e t i c t a p e s a r e n o t h a n d l e d b y t h e s p o o l i n g fu n c t i o n . Figure 1-3. Processing with Spooling
The JOB statement is read from the spooled reader and q u e u e d o n t h e d i s k b e f o r e th e s t a r t o f a j o b . S i m i l a r l y , th e j o b o u t p u t i s s t o r e d o 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 g a n d p r i n t i n g o c c u r s la t e r .
N o t e : A s i n g l e d i s k c o n t a i n s th e r e a d e r , p r i n t , a n d p u n c h q u e u e s .
't4
S p o o l i n g R o u t i n e s
P a r t i t i o n ' l
P a r t i t i o n 2
P a r t i t i o n 3 S p o o l R e a d e r
( d e s i g n a t e d a s th e s p o o l I n p u t d e v i c e d u r i n g s y s t e m g e n e r a t i o n )
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 r a n d s t o r e d o n d i s k .
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 .
Figure 1-4. Spooling Operation
S p o o l F i l e
P a r t i t i o n 1
P a r t i t i o n 2
P a r t i t i o n 3
l n t r o d u c t i o n 1 - 5
S u p e r v i s o r
R e a d e r O u e u e S p o o l i n g
R o u t i n e s P r i n t
O r r e r r
P a r t i t i o n 1 P u n c h
Oueue
P a r t i t i o n 2 S p o o l F i l e
P a r t i t i o n 3
A s t h e j o b s a r e e x e c u t e d in t h e p a r t i t i o n s , th e i r o u t p u t i s s t o r e d in t h e s p o o l f i l e .
J o b o u t p u t i s p u n c h e d o 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 g in the partitions.
Figure 1.5. Spooling Operation
P a r t i t i o n 2
P a r t i t i o n 3
This chapter covers the following spooling topics:
. Generating a spooling system o I P L ( i n i t i a l p r o g r a m l o a d ) o R e a d i n g ( i n p u t s p o o l i n g ) a Job execution
o P r i n t i n g o P u n c h i n g
Chapter 2. Processing with Spooling
T h e le v e l o f s p o o l s u p p o r t d e t e r m i n e s w h i c h u n i t - r e c o r d d e v i c e s c a n b e s p o o l e d . T h e s e l e c t e d l e v e l c a n a p p l y to p a r t i t i o n 1 , p a r t i t i o n 2 , p a r t i t i o n 3 , o r a n y c o m b i n a t i o n o f p a r t i t i o n s . l f i n p u t s p o o l i n g i s c h o s e n d u r i n g s y s t e m g e n e r a t i o n , o n e o f t h e f o l l o w i n g i n p u t d e v i c e s m u s t b e s e l e c t e d a s t h e d e v i c e f r o m w h i c h s p o o l e d i n p u t w i l l b e r e a d :
M F C U l ( M F C U p r i m a r y h o p p e r ) M F C U 2 ( M F C U s e c o n d a r y h o p p e r ) 1442
M F C M l ( M F C M p r i m a r y h o p p e r ) M F C M 2 ( M F C M s e c o n d a r y h o p p e r ) 2501
3 7 4 1 ( d i r e c t l y a t t a c h e d )
G E N E R A T I N G A S P O O L I N G S Y S T E M l f p u n c h s p o o l i n g i s c h o s e n d u r i n g s y s t e m g e n e r a t i o n , o n e o f t h e f o l l o w i n g p u n c h d e v i c e s m u s t b e s e l e c t e d a s th e D u r i n g s y s t e m g e n e r a t i o n . t h e u s e r c h o o s e s t h e s p o o l i n g d e v i c e o n w h i c h s p o o l e d o u t p u t w i l l b e p u n c h e d : support needed according to these considerations:
M F C U l ( M F C U P r i m a r Y h o p p e r ) A m o u n t o f m a i n s t o r a g e a v a i l a b l e M F C U 2 (M F C U s e c o n d a r y h o p p e r )
Disk space available 1442
J o b s t r e a m c h a r a c t e r i s t i c s M F C M 1 (M F C M p r i m a r y h o p p e r ) D e s i r e d t h r o u g h p u t M F C M 2 (M F C M s e c o n d a r y h o p p e r )
O n e o f t h e f o l l o w i n g f o u r l e v e l s o f s p o o l i n g s u p p o r t c a n T h e 1 4 0 3 p r i n t e r i s a l w a y s s u p p o r t e d w h e n e v e r s p o o l i n g i s b e s e l e c t e d d u r i n g s y s t e m g e n e r a t i o n : s p e c i f i e d . a n d it i s th e o n l y p r i n t e r t h a t c a n b e s p o o l e d . F o r
5 7 0 4 - S C 2 o n l y , a n a d d i t i o n a l 1 4 0 3 p r i n t e r c a n b e s e l e c t e d P r i n t s p o o l i n g d u r i n g s y s t e m g e n e r a t i o n a n d u s e d b y a s e c o n d s p o o l p r i n t P r i n t a n d p u n c h s p o o l i n g w r i t e r . S e e C h a p t e r 9 f o r i n f o r m a t i o n o n t h e s e c o n d I n p u t a n d p r i n t s p o o l i n g p r i n t e r .
I n p u t , p r i n t , a n d p u n c h s p o o l i n g
F i g u r e 1 - 2 s h o w s t h e c o m b i n a t i o n s o f u n i t - r e c o r d l / O d e v i c e s t h a t c a n b e u s e d w i t h t h e d i f f e r e n t l e v e l s o f s p o o l i n g support.
P r o c e s s i n g w i t h S p o o l i n g 2 - 1
I n a d d i t i o n t o s e l e c t i o n o f t h e l e v e l o f s p o o l i n g s u p p o r t a n d t h e s p o o l l / O d e v i c e s , t h e f o l l o w i n g s p o o l i n f o r m a t i o n m u s t b e p r o v i d e d d u r i n g s y s t e m g e n e r a t i o n :
S p o o l d i s k u n i t S p o o l d i s k s p a c e T r a c k g r o u p s i z e
Partitions with spool support Forms type and card type Autostart option
Autowrite option
E x t e n d e d re s t a r t o p t i o n ( 5 7 0 4 - S C 2 o n l y ) T i m e r e c o r d i n g o p t i o n
S y s t e m in p u t d e v i c e M a i n s t o r a g e s i z e
Spool Disk Unit
O n l y o n e d i s k u n i t ( s e e F i g u r e 1 - 1 ) c a n b e s p e c i f i e d t o c o n t a i n a l l s p o o l e d d a t a ; t h e s p o o l a r e a c a n n o t b e e x t e n d e d t o a n o t h e r d i s k . T h e u n i t a s s i g n m e n t c a n b e c h a n g e d d u r i n g I P L u s i n g th e S T A R T S P O O L c o m m a n d ( s e e C h a p t e r 5 ) .
Spool Disk Space
T h e a m o u n t o f s p a c e (i n n u m b e r o f c y l i n d e r s ) a l l o w e d fo r s p o o l e d re c o r d s m u s t b e s p e c i f i e d w i t h a m a x i m u m o f 1 9 9 c y l i n d e r s o n a 5 4 4 5 d i s k , 1 6 6 c y l i n d e r s o n a 3 3 4 0 m a i n d a t a a r e a , o r 1 8 6 c y l i n d e r s o n a 3 3 4 4 m a i n d a t a a r e a i n d i c a t i n g f u l l p a c k c a p a c i t y . T h e s p a c e i s o b t a i n e d o n t h e s p e c i f i e d d i s k u n i t d u r i n g I P L a n d r e s e r v e d f o r u s e b y s p o o l i n g u n d e r a f i l e n a m e ( $ S P O O I - ) i n t h e V T O C . I T h e
$SPOOL file is a special type of file that cannot be accessed b y d a t a m a n a g e m e n t ; i t i s l i s t e d w h e n y o u r u n t h e F i l e a n d V o l u m e L a b e l D i s p l a y P r o g r a m ($ L A B E L ) . 1 O n c e t h e s p o o l a r e a is f u l l , s p a c e m u s t b e f r e e d i n o r d e r t o c o n t i n u e . T h e a m o u n t o f d i s k s p a c e c a n b e c h a n g e d d u r i n g I P L b y u s i n g th e S T A R T S P O O L c o m m a n d ( C h a p t e r 5 ) . T h e f o l l o w i n g i t e m s s h o u l d b e c o n s i d e r e d w h e n s p e c i f y i n g t h e s i z e o f t h e s p o o l i n g a r e a ( A p p e n d i x C c o n t a i n s fo r m u l a s f o r e s t i m a t i n g t h e s i z e o f t h e s p o o l a r e a ) :
L e v e l o f s p o o l i n g fu n c t i o n M o d e o f o o e r a t i o n
T y p e o f p r i n t i n g a n d p u n c h i n g V o l u m e
Level of Spooling Function: A systenr with only prrnt s p o o l r n q r e q u i r e s o n l y d i s k s p a c e t o c o n t a i n th e p r i n t r e c o r c l s p r o d u c e d , w h e r e a s a s y s t e m w i t h i n p u t i p r i n t / p u n c h s p o o l r n g s u p p o r t r e q u i r e s d i s k s p a c e t o c o n t a i n t h e i n p u t r e c o r d s r e a d a n d t h e p r i n t a n d p u n c h r e c o r d s c r e a t e d .
Mode of Operation: When the spooled output of a lob s t e p a s c o m p l e t e l y p u n c h e d o r p r i n t e d , th e s p a c e i n t h e s p o o l a r e a is a v a i l a b l e f o r o t h e r o u t p u t r e c o r d s . T h u s , i f t h e p u r p o s e o f s p o o l i n g i s t o s a v e o u t p u t u n t i l a l a t e r ti m e ( s u c h a s s e c c n d s h i f t ) , a l a r g e r s p o o l a r e a is r e q u i r e d t h a n i f t h e r e c o r d s a r e p r . l n c h e d / p r i n t e d a s a v a i l a b l e .
Type of Printing and Punching. Output records containing f e w c h a r a c t e r s r e q u i r e le s s d i s k s p a c e t h a n r e c o r d s c o n t a i n - i n g r n a n y c h a r a c t e r s . T h i s i s b e c a u s e s p o o l r n g s u p p o r t t r u n - c a t e s ri g h t m o s t b l a n k s w h e n s t o r i n g o u t p u t r e c o r d s o n d i s k . F o r e x a r n p l e , J o b A p u n c h e s c o l u m r t s 1 - 2 0 , a n d J o b B p u n c h e s c o l u m n s 1 i - 2 0 a n d 3 0 7 0 . E a c h re c o r d w r i t t e n b y s p o o l t o d i s k f o r J o b A c o n t a i n s th e 2 0 c h a r a c t e r s t o b e p u n c h e d . w h i l e e a c h r e c o r d fo r J o b B c o n t a i n s 7 0 c h a r a c t e r s .
Volume; Jobs that have few lnput records or produce only a f e w o u t p u t r e c o r d s re q u i r e le s s d i s k s p a c e t h a n i o b s t h a t h a v e a l a r q e v o l u m e o f i n p u t d a t a o r c r e a t e a l a r g e v o l u m e o f o u t p r u t re c o r d s .
Track Group Size
T h e d i s k s p a c e f o r t h e s p o o l f i l e i s s e g m e n t e d i n t o e q u a l s i z e g r o u p s o f t r a c k s . E a c h tr a c k g r o u p r e p r e s e n t s a n e x "
t e n t o b t a i n e d b y s p , o o l i n g e a c h ti m e s p a c e i s n e e d e d ' T h e a l l o w e d t r a c k g r o u p s i z e s a r e 1 , 2 , 4 , 5 , a n d 1 0 t r a c k s " T h e s m a l l c r s i z e s n t i n i n t t z e u n u s e d a r e a s w i t h i n s p o o l i n g d i s k s p a c e ; t h e l a r g e r s r z e s i m p r o v e p e r f o r m a n c e f o r l o b s w i t h l a r g e v o l u m e s o f o u t p u t b y m i n i n l i z i n g t h e n r . r t n b e r o f t i n r e s s p o o l i n g is r e q u i r e d to o b t a i n a d d i t i o n z r l d i s k s p a c e ( s e e A p p e n d i x D ) .
Partitions with Spool Support
l f s i n g l e p a r t i t i o n s u p p o r t is d e s i r e d , t h e p a r t t i o n ( 1 , 2 , o r 3 ) t o b e s p o o l e d r n u s t b e s p e c i f i e d . W h e n m L t l t i p l e - p a r t i t i o n s p o o l s u p p o r t i s r : h o s e n , t h e s u p p o r t i s t h e s a m e in e a c h p a r t i ti o n .
Forms Type and Card Type
T h e f o r m s t y p e a n d c a r d t y p e o p t i o n s s u p p l y t h e d e f a u l t forms type and card type that will be used for spooled p r i n t e d a n d p u n c h e d o u t p u t . A n a l t e r n a t e fo r m s t y p e o r c a r d t y p e m a y b e s u p p l i e d o n t h e P R I N T E R o r P U N C H O C L s t a t e m e n t s a t e x e c u t i o n ti m e o r b y u s i n g a C H A N G E c o m m a n d a f t e r e x e c u t i o n h a s c o m o l e t e d .
Autostart Option
The autostart opt.ion automatically starts the reader, print w r i t e r , a n d / o r p u n c h w r i t e r w h e n s p o o l i n g is a c t i v a t e d a t
l P L . T h i s o p t i o n r e l i e v e s t h e o p e r a t o r o f h a v i n g to e n t e r t h c S T A R T R D R , S T A R T P R T , A N d S T A R T P C H C O M . m a n d s a t I P L ; h o w e v e r , o n c e t h e r e a d e r h a s b e e n t e r m i - n a t e d , a S T A R T R D R c o m m a n d i s r e q u i r e d to a c t i v a t e t h e r e a d e r a g a i n . L i k e w i s e , o n c e t h e w r i t e r h a s b e e n t e r m i n a - t e d , a S T A R T o r R E S T A R T c o m m a n d i s r e q u i r e d to a c t i - vate it again. Because the punch writer and reader cannot b e o p e r a t i n g s i m u l t a n e o u s l y , b o t h c a n n o t b e a u t o m a t i c a l l y s t a r t e d w h e n i n p u t a n d p u n c h s p o o l i n g a r e s u p p o r t e d . Note: lt the autostart option was selected, the print writer o r p u n c h w r i t e r b e g i n s a u t o m a t i c a l l y a t I P L i f t h e r e a r e r e c o r d s a l r e a d y in t h e q u e u e s . l f t h e r e a r e n o r e c o r d s in t h e queues, the output writers are started by the operator r e s p o n s e t o a m e s s a g e t h a t t h e q u e u e s a r e e m p t y o r h e l d .
Autowrite Option
The autowrite option reduces the interaction between s p o o l i n g a n d t h e o p e r a t o r . W h e n t h e p r i n t w r i t e r o r p u n c h w r i t e r s t a r t s , it a u t o m a t i c a l l y p r i n t s o r p u n c h e s w h e n e v e r o u t p u t i s a v a i l a b l e o n t h e q u e u e . W h e n a n o u t p u t q u e u e i s h e l d , a l l s t e p s o r r t h e q u e u e a r e h e l d , o r w h e n t h e q u e u e i s e m p t y , n o m e s s a g e i s w r i t t e n t o t h e C R T i n f o r m i n g t h e o p e r a t o r o f t h e s i t u a t i o n . N o o p e r a t o r a c t i o n i s n e c e s - s a r y to c a u s e t h e w r i t e r t o b e g i n e x e c u t i o n a g a i n . T h e w r i t e r m e r e l y w a i t s u n t i l o u t p u t i s a v a i l a b l e a n d b e g i n s a u t o m a t i c a l l y .
A i o b s t e p s p e c i f y i n g th a t t h e o u t p u t m a y b e p r i n t e d o r p u n c h e d d u r i n g e x e c u t i o n c a u s e s t h e w r i t e r t o b e g i n p r i n t - i n g o r p u n c h i n g if t h e r e i s n o o u t p u t o n t h e q u e u e a h e a d o f t h e e x e c u t i n g , o b s t e p .
The writers can still be stopped and started by using OCC.
W h e n s t o p p e d , th e w r i t e r d o e s n o t a u t o m a t i c a l l y b e g i n w h e n o u t p u t i s a v a i l a b l e ; t h e o p e r a t o r m u s t s t a r t t h e writer before output can begin.
Extended Restart Option (5704-SC2 only)
T h e e x t e n d e d re s t a r t o p t i o n a u t o m a t i c a l l y r e s t a r t s s o m e s y s t e m m e s s a g e s ; t w o s u c h s p o o l m e s s a g e s a r e N O I N P U T J O B A V A I L A B L E a n d R D R O l S E M P T Y / H E L D . W h e n e v e r a j o b i s p l a c e d o n t h e r e a d e r q u e u e , a l l N O I N P U T J O B A V A I L A B L E a n d R D R O l S E M P T Y / H E L D messages will be restarted if the new job can be run in a p a r t i t i o n t h a t i s h a l t e d b y o n e o f t h e s e m e s s a g e s . T h e messages will not be restarted if :
- T h e q u e u e is h e l d ,
- T h e j o b i s f o r a n o t h e r p a r t i t i o n ,
- T h e J O B s t a t e m e n t h a s P R IO R IT Y - O s p e c i f i e d , o r - T h e C O R E p a r a m e t e r va l u e s p e c i f i e d o n t h e J O B s t a t e -
m e n t i s t o o l a r g e .
For information on other system messages that can be automatically restarted, see the IBM Svstem/3 Model l5 System Control Programming Concepts and Reference Manual, GC21 5162.
Time Recording Option
T h e t i m e r e c o r d i n g o p t i o n c a u s e s a m e s s a g e t o b e w r i t t e n i n t h e s y s t e m h i s t o r y a r e a e a c h ti m e t h e p r i n t o r p u n c h w r i t e r c o m p l e t e s a j o b s t e p . T h e m e s s a g e c o n t a t n s t h e d a t e a n d t i m e t h a t t h e o u t p u t f o r t h e j o b s t e p w a s s t a r t e d a n d t h e t i m e t h a t t h e o u t p u t w a s c o m p l e t e d .
T h i s m e s s a g e m a y b e u s e d a s a n a i d f o r p e r f o t m a n c e p l a n n i n g o n a s p o o l i n g s y s t e m . F o r a d d i t i o n a l in f o r m a t i o n a b o u t p e r f o r m a n c e . s e e C h a p t e r 7 . T h e t i m e r e c o r d i n g m e s s a g e m a y a l s o b e u s e d fo r j o b a c c o u n t i n g p u r p o s e s .
N o t e : l I c o n s i s t e n t e l a p s e d t i m e s a r e e x p e c t e d , t h e o u t p u t w r i t e r s s h o u l d h a v e a s y s t e m p r i o r i t y h i g h e r th a n t h a t o f t h e p r o g r a m p a r t i t i o n s . F o r i n f o r m a t i o r r a b o u t t h e P T Y command, see Chapter 5.
System lnput Device
A s y s t e m in p u t d e v i c e is a s s i g n e d t o e a c h p a r t i t i o n ; f o r e x - a m p l e . th e 2 5 0 1 c a n b e a s s i g n e d f o r p a r t i t i o n 1 a n d t h e C R T / K e y b o a r d f o r p a r t i t i o n 2 . W h e n t h e o p e r a t o r In i t i a t e s a j o b f o r a p a r t i t i o n , t h e p a r t i t i o n r e a d s O C L s t a t e m e n t s f r o m i t s i n p u t d e v i c e . A l s o , d u r i n g s y s t e m g e n e r a t r o n , i f i n p u t s p o o l i n g is t o b e u s e d , a n i n p u t d e v i c e rn u s t b e a s - s i g n e d a s t h e s p o o l e d r e a d e r . T h e d e v i c e a s s i g n e o a s t h e s p o o l e d re a d e r c a n b e t h e s a m e d e v i c e s p e c i f i e d a s t h e s y s t e m in p u t d e v i c e .
P r o c e s s i n g w i t h S p o o l i n g 2 - 3
l f i n p u t s p o o l i n g fo r t h e 2 5 0 i w e r e c h o s e n fo r p a r t i t i o n 1, the 2501 should also be specified as the system input device.
J o b s a r e i n i t i a t e d fr o m t h e r e a d e r q u e u e w h e n t h e s y s t e m i n p u t d e v i c e is a l s o th e s p o o l i n p u t d e v i c e .
A p a r t i t i o n ' s s y s t e m in p u t d e v i c e c a n b e c h a n g e d b y a R E A D E R O C L s t a t e m e n t o r b y a R E A D E R c o m m a n d . C o n s i d e r a s i t u a t i o n w h e r e ( 1 ) t h e s y s t e m in p u t d e v i c e fo r p a r t i t i o n 1 i s t h e 2 5 0 1 , (21 the spool input reader is the M F C M l , a n d ( 3 ) a j o b t o b e e x e c u t e d in p a r t i t i o n 1 c o n - s i s t s o f R P G l l p r o g r a m s t h a t u s e th e M F C M l f o r c a r d i n p u t d a t a . T h e j o b i s p l a c e d in M F C M j, t h e M F C M i s r e a d - i e d , a n d t h e o p e r a t o r is s u e s t h e S T A R T R D R c o m m a n d . A f t e r t h e j o b h a s b e e n r e a d , th e o p e r a t o r s h o u l d n o t initi_
a t e j o b e x e c u t i o n in p a r t i t i o n 1 u n t i l t h e s y s t e m in p u t de_
v i c e fo r p a r t i t i o n 1 i s c h a n g e d . T h i s c a n b e d o n e with a R D R P 1 , M F C M 1 c o m m a n d o r b y p u t t i n g // R E A D E R M F C M l i n t h e 2 5 0 1 . N o w p a r t i t i o n 1 c a n b e s t a r t e d . lf the operator initiated partition I before changing tlre read- er, the system would have attempted to read from the 2 5 0 1 , w h i c h c o u l d b e e m p t y , c o n t a i n b l a n k c a r d s , o r c o n t a i n s o m e o t h e r j o b .
Main Storage Size
T h e a m o u n t o f m a i n s t o r a g e a v a i l a b l e f o r s p o o l i n g s h o u l d b e t a k e n i n t o c o n s i d e r a t i o n b a s e d o n t h e a m o u n t r e a u t r e d t o s u p p o r t t h e d e s i r e d f u n c t i o n s . T h e m a i n s t o r a g e re q u i r e _ ments for the spooling functions selected are stated in A p p e n d i x B .
I P L
S p o o l i n g , s e l e c t e d a s a f e a t u r e d u r i n g s y s t e m g e n e r a t t o n , i s l o a d e d a t I P L w i t h t h e s u p e r v i s o r . U p o n c o m p l e t i o n of the IPL process, the system date can be entered before p r o c e s s i n g c o n t i n u e s . A d i s p l a y o n t h e C R T c o n t a i n s E J m e s s a g e s f o r t h e p a r t i t i o n s . A t t h i s t i m e , b e f o r e in i t i a t i n g any lobs, the operator decides whether to activate or can- c e l t h e s p o o l s u p p o r t . T h e C A N C E L S P O O L c o m m a n c l {see Chapter 5) causes the spooling support to be removed f r o m m a i n s t o r a g e , m a k i n g a d d i t i o n a l m a i n s t o r a g e a v a i l a b l e t o a n y p a r t i t i o n . l f s p o o l i n g s u p p o r t i s d e s i r e d la t e r , the o p e r a t o r m u s t p e r f o r m a n I P L a g a i n .
lf the operator chooses to operate with spool, spooling can b e g i n e i t h e r b y a c o m m a n d p r i o r t o j o b e x e c u t i o n o r b y operator response to an IPL EJ message for a partition.
To start without any changes to the spool disk space, thr,.
o p e r a t o r b e g i n s j o b e x e c u t i o n b y r e p l y i , r g to o r r e cf the I P L E J m e s s a g e s o r e n t e r i n g a S T A R T S P O O L c o m m a n d ( s e e C h a p t e r 5 ) . E i t h e r a c t i o n c a u s e s t h e d i s k s p a c e u s e d b y s p o o l i n g to b e o b t a i n e d a c c o r d i n g t o t h e d i s k u n i t a n d s i z e s p e c i f i e d d u r i n g s y s t e m g e n e r a t i o n . A n y e x r s t i r r g s p o o l e d in p u t a n d / o r o u t p u t r e m a i n s in t h e s p o o l a r e a a r r d i s n o t l o s t .
T o o v e r r i d e s p e c i f i c a t i o n s m a d e d u r i n g s y s t e m g e n e r a t i o n , t h e o p e r a t o r e n t e r s a S T A R T S P O O L c o m m a n d w i t h t h e p a r a m e t e r s t o b e c h a n g e d . T h e o p e r a t o r m a y ( 1 ) a l t e r t h e s p o o l d i s k u n i t u s e d , ( 2 ) c h a n g e th e s i z e o f t h e s p o o l i n g a r e a , (3 ) c h a n g e t h e s i z e o f t h e t r a c k g r o u p s w i t h i n t h e s p o o l i n g a r e a , o r ( 4 ) r e f o r m a t t h e s p o o l a r e a ( c a u s t n g e x l s t . i n g s p o o l e d l/ O d a t a t o b e l o s t ) . O n c e s p o o l i n g is i n i t i a t e d ( a t I P L ) , t h e d i s k p a c k u s e d fo r the spooling area slrould not be removed until another IPL is performed.
N o t e : l f a n o t h e r I P L i s p e r f o r m e d w h i l e s p o o l i n g is b e i n g a c t i v a t e d , t h e r e i s a c h a n c e th a t t h e s p o o l d i s k s p a c e w a s n o t c o m p l e t e l y a l l o c a t e d fo r s p o o l i n g . T h a t i s , t h e s p a c e may have been obtained but an entry was not yet made in the VTOC to account for the space. To determine whether t h i s s i t u a t i o n e x i s t s , e i t h e r a t t e m p t t o u s e th e d i s k p a c k a g a i n f o r s p o o l i n g o r d i s p l a y t h e V T O C u s i n g $ L A B E L . l f t h i s s i t u a t i o n o c c u r s , th e F O R M A T f u n c t i o n o f $ D E L E T w i l l f r e e t h e i n a c c e s s i b l e s p a c e .
A c t i v a t i n g s p o o l i n g d o e s n o t c a u s e t h e r e a d e r , p n n t w n t e r , o r p u n c h w r i t e r t o s t a r t u n l e s s a u t o s t a r t h a s b e e n g e n e r a t e d l f t h e a u t o s t a r t fu n c t i o n w a s s p e c i f i e d d u r i n g s y s t e m g e r r e r - a t i o n , t h o s e d e v i c e s s o s p e c i f i e d a r e a u t o n ' t a t t c a l l V s t a r t e d w h e r r s p o o l i n g is a c t i v a t e d . l f a u t o s t a r t w a s n o t g e n e r a t e d , t h e o p e r a t o r m u s t e n t e r S T A R T c o m m a n d s to i n i t t a t e th e d e s i r e d s p o o l i n g f u n c t i o n .
E n t e r i n g th e S T A R T R D R c o m r n a n d c a u s e s t h e s p o o i e d r n p u t d e v i c e to s t a r t r e a d i n g a n d p l a c i n g th e j o b s i r r t h e r e a d e r q u e u e . E n t e r i n g th e S T A R T P R T o r S T A R I P C F i c o m m a n d s a c t i v a t e s t h e r e s p e c t i v e o u t p u t w r i t e r s o t h e p r i n t i n g o r p u n c h i n g o f s p o o l e d re c o r d s f r o m t h e p r i n t o r p u n c h q u e u e c a n b e g i n . l f j o b s t e p s h a v e n o t p u t a n y r e c o r d s in t o t h e p r i n t o r p u n c h q u e u e s , a m e s s a g e ( P R T O lS E I V I P T Y / H E L D o r P C H Q l S E M P T Y / H E L D ) i s s h o w n o n t h e d i s p l a y s c r e e n "
I t t h e o p e r a t o r a t t e m p t s to s t a r t e i t h e r t h e r e a d e r o r t h e p u r r c h w r i t e r a f t e i t h e o t h e r h a s s t a r t e d , a m e s s a g e a p p e a r s o r r t h e C R T i n d i c a t i n g R E A D E R / W R i T E R A C T I V E s i n c e b o t h t h e r e a d e r a n d t h e p u n c h w r i t e r c a n n o t b e o p e r a t i n g a t t h e s a m e ti m e . A s s o o n a s t h e i n i t i a t e d fu n c t t o n t e r - m i n a t e s , t h e o p e r a t o r c a n s t a r t t h e o t h e r f u n c t i o r - r .
A t t h i s p o i n t , it m a y b e h e l p f u l f o r t h e o p e r a t o r t o d i s p l a y the system status to determine that the system is set-up as d e s i r e d . T h e D I S P L A Y c o m m a n d ( s e e C h a p t e r 5 ) w i t h t h e STATUS operand shows the system status; for example, f o r 5 7 0 4 - S C 1 :
C - _ - _ - _ S Y S T E M S T A T U S D I S P L A Y ( S P , P 2 , P ] , )
P A R T 1 _ 2 4 K P A R T 2 _ 2 4 K
C A S H F L O I , J S T E P 3 L A S O R S T E P 9 R D R _ M F C M ] ,
P R T - 1 4 0 3 P C H _ M F C M 2
S P O O L ) R D R - 3 2 1 1
S P O O L ) P R T _ 1 , 4 0 3 ( S P O O L ) S P O O L ) P C H - M F C I 4 2 ( S P O O L ) 1 8 K A V A I L A B L E 0 1 , / 2 8 / 1 4 1 ' O t 2 1 ' 2 4 1 ,
S P O O L S T A T U S D I S P L A Y
R D R _ M F C M I / E M P U N I T * D 1 T C Y L - ] ' O O P R T _ 1 , 4 0 3 / A C T / H T K G P S I Z E * 5 / 3 9 8 P C H _ M F C M Z / A C T T K G P S A V A I L _ 3 3 0 E N T E R D I S P L A Y R E O U E S T M S G N O T R S P O 3
R E A D I N G ( I N P U T S P O O L I N G ) Job Stream
P r i o r t o e x e c u t i n g a n y p r o g r a m s o n t h e M o d e l 1 5 u s i n g spooling support, the system programmer should consider the organization of the job stream. Although no changes i n t h e p r o g r a m s a r e r e q u i r e d ; t h e f o l l o w i n g s h o u l d b e observed:
o Several additional OCL statements can be added.
o The order of program execution can be changed for better performance and device utilization.
T h e i n p u t s t r e a m c o n s i s t s o f t w o d i f f e r e n t u n i t s o f w o r k : jobs and job steps. Each job is a group of related job steps t o b e e x e c u t e d in a s e q u e n t i a l m a n n e r . A j o b i n c l u d e s a l l n e c e s s a r y p r o g r a m s , f i l e d e f in i t i o n s , a n d O C L s t a t e m e n t s n e e d e d t o a c c o m p l i s h a s p e c i f i c f u n c t i o n . W h e n i n p u t s p o o l i n g is u s e d , th e s t e p s m u s t c o n s i s t o f O C L o r O G L p l u s d a t a ; y o u c a n n o t s p o o l o n l y t h e d a t a .
D e f in i n g a s e r i e s o f r e l a t e d s t e p s a s a s i n g l e j o b m a y b e r e - q u i r e d e i t h e r b e c a u s e o f t h e s e q u e n c e o f f u n c t i o n s o r b e - cause it may provide specific advantages. For instance, m u l t i p l e s t e p s w i t h i n a s i n g l e j o b a r e p r e f e r a b l e w h e n t h e e x e c u t i o n o f a l a t e r s t e p i s d i r e c t l y d e p e n d e n t u p o n t h e s u c c e s s f u l c o m p l e t i o n o f a n e a r l i e r s t e p . l f a s t e p t e r m i n - a t e s a b n o r m a l l y , th e r e m a i n i n g s t e p s in t h e j o b a r e b y p a s s e d .
W h e n u s i n g in p u t s p o o l i n g , i t i s a l s o a d v a n t a g e o u s t o c o n - s i d e r th e p l a c e m e n t o f j o b s w i t h i n t h e j o b s t r e a m . A i o b with a small amount of input should be placed on the queue before a job with a large amount of input, allowing the first job to begin execution while the second one is being read into the queue.
OCL Considerations
T h e b e g i n n i n g o f a j o b ' s O C L i s i n d i c a t e d b y t h e J O B O C L statement or the statement after a /. statement. All OCL statements and data that follow the JOB statement, up to the next JOB or /. statement, are associated with that job.
A n y n u m b e r o f L O A D / R U N a n d / o r C A L L / R U N c o m b i - nations can be included. Spooling uses the information from the JOB statement to build the queues on disk. For
i n s t a n c e , t h e P A R T I T I O N p a r a m e t e r e n a b l e s i o b s f o r a l l partitions to be read from one system input device by specifying the partition designated for job execution.
T h e P U N C H a n d P R I N T E R O C L s t a t e m e n t s a r e a l s o u s e d b y s p o o l i n g s u p p o r t a n d c a n b e i n c l u d e d in t h e i o b s t r e a m { s e e C h a p t e r 6 ) .
A / . s t a t e m e n t s h o u l d b e u s e d a f t e r e a c h io b a s a d e l i m i t e r . ( A l t h o u g h , if a / . s t a t e m e n t is n o t u s e d , th e J O B s t a t e m e n t f o r t h e n e x t j o b a c t s a s a j o b d e l i m i t e r . ) W h e n t h e j o b b e i n g p u t i n t h e r e a d e r q u e u e i s n o t s e p a r a t e d f r o m t h e n e x t i o b by a /. statement, spooling generates a /. statement as the last statement for the job in the queue. When the system h i s t o r y a r e a is d i s p l a y e d o r p r i n t e d , o r w h e n t h e s t a t e m e n t i s l o g g e d o n t h e s y s t e m lo g g i n g d e v i c e , th i s s t a t e m e n t m a y c o n t a i n u n p r e d i c t a b l e c h a r a c t e r s f o l l o w i n g t h e / . .
T w o c o n s e c u t i v e / . s t a t e m e n t s i n d i c a t e th e e n d o f t h e e n t i r e j o b s t r e a m . W h e n u s i n g in p u t s p o o l i n g , th e s e tw o c o n s e c u - t i v e / . s t a t e m e n t s c a u s e t h e r e a d e r t o b e t e r m i n a t e d , re l e a s ' i n g t h e i n p u t d e v i c e .
P r o c e s s t n g w r t h S P o o l r n q 2 5
Perf or ma nce C o ns i derat i o n s
To improve performance, the following items should be c o n s i d e r e d w h e n p l a n n i n g a j o b s t r e a m :
1 . W h e n s p o o l i n g i n p u t , m a k e t h e f i r s t jo b o n e th a t contains little or no input data. The sooner a job is on the reader queue, the sooner a partition can be initiated to execute that lob.
2 . W h e n s p o o l i n g i n p u t , d e f i n e t h e f i r s t jo b w i t h a m i n i m u m n u m b e r o f j o b s t e p s _ preferably o n e . A p a r t i t i o n c a n n o t b e in i t i a t e d u n t i l th e e n t i r e j o b is on the reader queue.
3 . W h e n e x e c u t i n g i n m u l t i p l e p a r t i t i o n s , a v o i d u n n e c e s _ s a r y d i s k c o n t e n t i o n c a u s e d . f o r e x a m p l e , b y r u n n i n g two sort programs at the same time.
4 . W h e n n o t u s i n g p u n c h s p o o l i n g s u p p o r t , c a r e f u l l y p l a n th e p l a c e m e n t o f j o b s t e p s t h a t r e q u i r e t h e p u n c h d e v i c e .
5. Avoid contention between the reader and the punch device and also between punch requests to the same d e v i c e f r o m m u l t i p l e p a r t i t i o n s a t t h e s a m e t i m e .
Limitations of lnput Spooling
T h e fo l l o w i n g l i m i t a t i o n s a p p l y to a n y i n p u t b e i n g s p o o l e d from the job stream:
Output operations (such as stacker selection or combined f i l e s ) c a n n o t b e p e r f o r m e d o n s p o o l e d in p u t f iles.
The following record lengths for each device are used:
a. From the MFCM, 2501, and 1442, only g0-byte records are written in the reader aueue.
b . F r o m t h e M F C U , o n l y 9 6 - b y t e r e c o r d s are written i n t h e r e a d e r q u e u e .
c . O t h e r c a r d s i z e s , s u c h a s 5 l - c o l u m n c a r d s , c a n n o t be used.
d . F r o m t h e 3 7 4 1 , 1 - t o 1 2 8 - b y t e re c o r d s are wfltten i n t h e r e a d e r q u e u e .
T h e r e a d c a r d i m a g e ( c o l u m n b i r r a r y ) o p e r a t i o n is not supported.
Reader Oueue
Once the job stream has been constructed, the records have been placed into the reader, and lpL has been c o m p l e t e d o n a s y s t e m w i t h i n p u t s p o o l i n g , th e r e a d e r q u e u e c a n b e b u i l t o n d i s k . l f a u t o s t a r t was specif i e d f o r i n p u t s p o o l i n g d u r i n g s y s t e m g e n e r a t i o n , t h e r e a o e r starts reading records when spool is activated following an lPL. lf autostart is not in effect, the operator musr e n t e r a S T A R T R D R c o m m a n d w h e n j o b s a r e to be read into the reader queue.
T h e r e a d e r q u e u e is b u i l t o n d i s k a s t h e j o b s t r e a m is r e a d ( s e e F i g u r e 2 - 1 ) . T o t h e s p o o l r e a d e r . a J O B s t a t e m e n t indicates the beginning of a new job; a l. or another JOB s t a t e m e n t in d i c a t e s t h e e n d o f t h e j o b . O n e r e a d e r q u e u e entry is created for each job read. All steps within a job a r e s c h e d u l e d f o r s e q u e n t i a l e x e c u t i o n in t h e s a m e p a r t i t i o n . E a c h jo b i s i d e n t i f ie d o n t h e q u e u e b y t h e j o b n a m e . lf a n y e r r o r s a r e f o u n d o n t h e J O B s t a t e m e n t . th a t j o b i s a s s i g n e d a p r i o r i t y o f 5 o n t h e r e a d e r q u e u e . I n a d d i t i o n , i f t h e j o b n a m e is m i s s i n g o r i n v a l i d , th e d e f a u l t n a m e J O B i s a s s i g n e d t o t h a t j o b o n t h e r e a d e r q u e u e .
S p o o l i n g R o u t i n e s
P a r t i t i o n 1
P a r t i t i o n 2
S p o o l F i l e
F i g u r e 2 - 1 . B u i l d i n g t h e R e a d e r O u e u e
P r o c e s s i n g w i t h S p o o l i n g 2 - 7
