( %& !' ( )!$* ( , + ( -) & ( ( )!$* & () !" # – $ !/ $ & +( 0 ! " & ( , <: 9/ :): – &)= : $ ( ,% ! < ( ( ,5 & .2 ( ,5 – %& 1 .! ( / & 0 .2 3, . ( , ( 5 678 /9 + /9 + ( , < .2 <: 9/ :): > ?@ ( , /& : 1 .2 $ !/ ( /678 ? 6 / <: 9/ :): /& : 1 / ! < ( /678 ( 6 & < & 1 +%, ' (%)* & / ) /= A ) !<! ( ,( B( /& ) ( , : ( , ( B < D 9 C . : E) ( . :) . :) ( ) : ) = 2* A /& < ( ( , > I ) ! ) %I ( H ) 1 K (> !H J ! < ( , . , ) ( 5)!N O K ) .2 (Non-Preemptive) . !H (Preemptive) ) 1 2 @ /& ) 1 .2 >!?6 ( ! ( , . ( :) ) ( : > . (( @ P ) @ P & ! . :) ) = 2* A /& < 2* A ( < & B 2* A /& < 2* A ( < & B 2* A /& ) = 2* A ( . 3, . , *: J2 ) P& ( ( ( ( ( RS ( , ) $? : 0 2 ( ,( H ) 8: 8: 8: 8: ) ) ) 1 :) ( ?@ ):B(:) /& . ( ) ( , G /& ( < ,G ,G ,G ,G ) &) ? /& / P / ) @ . . , Q: C ( ( , G /& . , . /P 5 678 < R $ /08: . #8! : ! A ) V I T1 ) U ! * ! 5 ( :2 &. ( A )O .! !P1 ( , + P & 3, 2 (Dispatcher) / 0 %& < >A) ( ,( ) ( ,> ( , W (! 5 ! (% ! C ( , /& : H : 3, 5)!N R H O + ) O . .B Y: < S Y: / *: 0 1 %2 ( )!$* ( , + ( -) & ( ( )!$* & () (Context Switch) O X !6 &) 2* A /& > I 2 <Z / &[ < /& Q , : ( ,G . #8! & R(\ . ( :W (! $ ( , 9 < 1 %2 1 %2 ( , ): .) $ >!] ) ( ,. \ (Throughput) ( & . & . , . ( A: ) B) / ( , 6 (Turnaround time) <: 9 2 H & . ( 2 H & : .B <. , ( ,G < Y: O& (/N . <: 9 (Waiting Time)) = . ( )3H B ( , #N ) ( , G / (Response Time)^ , . ( & A . ( Y!?S .2 % ! ^ , O *: *! : ( , G /& ' I > ) O & (/N .( , J2 5: 0 <: 9 2 H & . ( & ( , % ! ^ , O *: *! . ( / ) ) <: 9 > I O _? : 6& <: 9 *! . ( .!+ . ! ? <: 9/ :): : $ &) 6 (&: ( , H) & . ^ , : ) = J <: 9 2 H & . ( . / & / ? 3 First Come, ) .B /& / *: 0 ( %& !' ) %3 ( , + ( -) & ( ( )!$* & () First Come, ) / & , ( P P2 0 P3 3 3 : 0 J6 :([ /&) p3 : p2 Jp1 ) = . ( (6 + 3) / 3 = 3 :) = . ( % ! :) m & ( , :( < m /& . !H (Convey Effect) :( J ! + (First Served P P1 P2 0 24 P3 27 30 27 : 24 J0 :([ /&) p3 : p2 Jp1 ) = . ( (24 + 27) / 3 = 17 :) = . ( % ! (SJF) )! ) 9 ) 30 & , ) : :( / ( , . & D 9 J24 < . ( & [ /& ) p3 : p2 Jp1 ( , :> ` G P ) : [ /& ( , d . $& = ) 3 : 3 :2 ( /& < 2 H ) !? FCFS e f . ! + P1 6 ( , ) (First Served ) : p1 : p3 Jp2 [ /& ( , d \A :2 ( /& < 2 H ) !? FCFS e f . ! / 6& / & &%/ + ( , /678 >!f / ( , /& ( , D 9 .2 +! /? ( .B ( :> : ( ,> @ P /& ( , /& ( , 8: : ) 1 K ( , /678 . , ( U, %I : 2 ( , .! @ P ) 9 ) ) 1 5)!N /& ( , > : ) 1 . ( ( .B ( )! ( , /678 >!f / ( , :): & 3* J2 < ( , /& ( , J2 ? ) < ( , ( , /678 ? 8 & Shortest Remaining Time First (SRTF) Q:) O /& . ! .! / 0H 4 ( ) (SJF) / & &%/ + 6 O /& 2 / & SJF ( . 2 /& ) ( , ) = ( 5)!N /& ) p4 p1 ( , :> ` G . (% ! O ? / : $& = ) /678 >!f 7 4 1 4 :): . ( 0 2 4 5 P1 0 2 4 P1 4 2 P2 1 4 P3 4 5 P4 P4 7 (9 + 1 + 0 + 2) / 4 = 3 2 P2 1 4 P3 4 5 P4 P3 3 7 5 ( , 5 P1 4 4 5 P4 12 16 :) = . ( % ! +%9 ( , 5 678 /678 n =1 = P1 11 P2 8 (0 + 6 + 3 + 7) / 4 = 4 P4 0 4 ( , 0 P1 P3 :): . ( P2 :): . ( 7 0 P2 7 P3 /678 >!f P1 /678 >!f P2 8) SJF ( , 67 ) SRTF ( 67 ( : . ( O ?C . ! ? O$ V , >!f tn + (1 n ) 6& ( , /678 >!f & / 1 :>!?6 :) ( 8 ( , /678 O n 68 : >!f t n H : ) : ) J & 6& ( , n. .2 G : 0N O & ] G .B ) / 16 :) = . ( % ! 5 ( +%9 ) : ( +%9 ) : = n =' ( , 5 678 >!f n+1 . / $ ) 8 /<! )! .2 / H ) 8 /<! )! J P G ( , :P .! ( , 2 !*: . ! @ /& p 1N ) ( @ O +! =) 2 !*: O \ & / (Round Robin) .2 0 @ G ( , /& ( , /& ( , .! ) & 8 ) 1 K : ) 1 2* A : ) >!f .B 2 !*: ) 6 / 2 ) 2 !*: ( G SJF .2 6& ( , /678 , < $_ O , 2 !*: & ( ,2 O ? : . 718 . ! . ( 2 3H V & ( , 2 !*: q : A ) =) n+1 = tn ( /678 O 9B 68 : >!f +! : . P ;% 9 & m 1 - : / SB ( ) 9 5 ?< < ( ;% ( ) I / ( , . ( ( +! A : ( /& ( , ( , J2 / m 100 10 O & \!?6 : ! !9 . H ) 9 ) ) /? 9 ( , < /& J ( ) I . " ( U, .! I B ( , #N /& ( , : ! () I : & B ( , #N ) ( , n H C (n-1)q ( & ( , r $B J & q & & . ? ( ,D 9 = 6 ( ) < ( ;% ( ) I & ) I /& H 2&! () P .) 718 . $ P& H 2&! R @ . C ( (G ) ) ( ( , :> ` : $& = ) 20 ( ( , P1 P2 P3 P4 ( /678 53 17 68 24 : ) FIFO . ( /& 2 P C () I H ?1 & 8 O X !6 ) & J s) & ) =% & & s) & () I G+! () I ( /& O X !6 . !& !C > ? @ & < ( ;% ) :2 P1 0 2 P2 20 SJF P3 37 ( P4 57 P1 77 \ & RR ) $ ! A ,B& ? P3 ( P4 97 117 /& < 2 H ) !? P1 P3 P3 121 134 154 162 <: 9 2 H & . ( % ! \!?6 .2 & .B ^ , . ( (Q) ? @ & 7 7 E " CD ) < & B ( , #N 17 . / ( U, : / ( q , . ) ) !9 D 9 ( 7 E " CD ) + #N (G PI #N + /& ( , #N : ( ` )!$* #N : / ( q , #N & (Round Robin) H 2&! ( ` / ( U, #N & (FCFS) ) O ? 8 >: ( . 3, 5)!N : / ( q , #N : / ( q , #N #N O & & ( ( , >: / ? ` ) 2& m 2 !*: & ( 718 79 (/ ( U, #N ( , 6& & ( , . ( %80 ` ) ( /678 ( (/ ( U, #N & %20 7 E " %! CD (Multilevel Feedback Queue) R 5)!N /& ( , 17 + #N ( Q:) ) ( Q:) ) v D 9 #N G /& ?6* #N O & ! ( , G 17 + )!9( & #N . 2 A# C /& : 1 . > 6 P ) 8 & Q:) O N ( /+ .2 .B < #N : ( , G . !& ( , ) 8 \ & 2 !*: & < #N ) & & ( , /& ( , . H ( # 6 ) 7 E " ( )! V %! & 17 CD + )!9( & #N (G :! #N 6 #N ( )!$* 2 !*: & #N /& ( , G > I &[ . ( w C Q:) & ? ( , # C #N /& ( , D 9 Q:) 8 7 E " %! CD :#N / & 17 / 5 7 E " %! CD F , (G ( /678 & H 2&! ( : Q0 ( /678 & H 2&! 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