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O =2B: Scheduling`Introduction to scheduling Batch systems Interactive systems Real-time systems Thread schedulingRJ SchedulingProblem Several ready processes & Fewer CPUs than processes A choice has to be made By the scheduler Using a scheduling algorithm Why is this important? Scheduling through time Early batch systems Early timesharing systems Personal computers Networked workstations and servers4Ed4           dC;Process behaviorBursts of CPU usage alternate with periods of I/O wait CPU-bound process I/O bound process As CPU gets faster  more I/O bound processes@7$.7$.D<When to schedule?At process creation When a process exits When a process blocks on I/O, a semaphore, & When an I/O interrupts occurs At fixed periods of time Preemptive and non-preemptive schedulers Need a HW clock interrupting2nGnGE=Environments and goals0Different scheduling algorithms for different application areas Worth distinguishing Batch Interactive Real-time All systems Fairness  giving each process its fair share Policy enforcement  seeing that stated policy is carried out Balance  keeping all parts of the system busyVUZZ ZZU  SKEnvironments and goalsBatch systems Throughput  maximize jobs per hour Turnaround time  minimize time bet/ submission and termination CPU utilization  keep the CPU busy all time Interactive systems Response time  respond to requests quickly Proportionality  meet users expectations Real-time system Meeting deadlines  avoid losing data Predictability  avoid quality degradation in multimedia systems WgW  hF>Scheduling in batch systems  First-Come First-Served Simplest, easy to implement, non-preemptive Problem: 1 CPU-bound process (burst of 1 sec.) Many I/O-bound ones (needing to read 1000 records to complete) Each I/O-bound process reads one block per sec! P66  TLScheduling in batch systems Shortest-Job First Assumption  total time needed is known Provably optimal First job finishes at time a Second job at time a + b Mean turnaround time (4a + 3 b + 2c + d)/4 A preemptive variation  Shortest Remaining Time (or SRPT)ZZ9ZgZ=Z9g= G?First-come first-served'Order of arrival: P1 , P2 , P3 Gantt Chart for schedule Waiting times: P1 = 0; P2 = 24; P3 = 27 Average waiting time: (0 + 24 + 27)/3 = 17 Order of arrival: P2 , P3 , P1 Gantt chart for schedule is Waiting times: P1 = 6; P2 = 0; P3 = 3 Average waiting time: (6 + 0 + 3)/3 = 3 S[   0     ,H@ SJF and SRTSJF Non-preemptive  avg. waiting time = (0 + 6 + 3 + 7)/4 = 4 SRT Preemptive  avg. waiting time = (9 + 1 + 0 +2)/4 = 3 .|{ IAMultilevel scheduling  JBRound-robin schedulingSimple, fair, easy to implement, & widely-used Each process gets a fix quantum When process quantum expires, if running preempt CPU With n processes & quantum q, each one gets 1/n of the CPU time, no-one waits more than (n-1) q Length of quantum Too short  low CPU efficiency Too long  low response time Commonly ~ 20-50 msec. TG:*SKC Example of RRQuantum = 20  LDPriority scheduling2Each process has a priority number CPU allocated to process with highest priority Problem: starvation  low priority processes may never execute Solution: Aging ! increases priority Use maximum quantum Variation  priority classes Priority scheduling among classes RR within class /3Q @) 3MEMultiple (feedback) queues6Partition ready queue, each with = or != algorithm Example CTSS 7094 had only space for 1 process in memory Context switch = swap Goals: low context switching cost & good response time Priority classes: class i gets 2i quantas (i: 0 & ) If process uses all its quanta ! move to next lower queue What about process with long start but interactive after that? Carriage-return hit ! promote process to top class J@,5@, b D   Zb3bNFSome other algorithmsShortest process next  estimate with path history a Ti + (1  a) Ti+1 a controls the  weight of history Guaranteed scheduling - e.g. proportional to # processes Priority = amount used / amount promised Lower ration ! higher priority Lottery scheduling  simple & predictable Each process gets lottery tickets for resources (CPU time) Scheduling  lottery, i.e. randomly pick a ticket Priority  more tickets means higher chance Processes may exchange tickets Fair-Share scheduling  schedule aware of ownership Owners get a % of CPU, processes are picked to enforce it &4P>P9PHP*PPPYP4    !96  b*  X$$$$OGReal-time schedulingDifferent categories Hard RT  no on time ~ not at all Soft RT  important to meet guarantees but not critical Schedulable real-time system m periodic events event i occurs within period Pi and requires Ci seconds Then the load can only be handled if ZJ&0     %    PHThread schedulingNow add threads  user or kernel level? 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T3f3f___PPT10i.q0:>+D=' = @B +  <(  ~  s * Q0   ~  s *TJ{0  H  0޽h ? !P3fPP3y___PPT10Y+D=' = @B +  T<(  T~ T s * 0   ~ T s *p{0  H T 0޽h ? !P3fPP3y___PPT10Y+D=' = @B +   <(  ~  s *0   ~  s *Ў{0  H  0޽h ? ̙33y___PPT10Y+D=' = @B +<  c[ \(  \~ \ s *;0  ; ~ \ s *{0 ; t  H > \ #"& >c  \ # lp1? >X  Ic @` \ # lw1? X  I3 @` \ # lP1?X > Id @` \ # lЉ1? X  I4 @`  \ # l}1? >  Ib @`  \ # ls1?   I2 @`  \ # lx1? >  Ia @`  \ # l1?   I1 @`  \ # l1?H >  S Finish time   @` \ # l1? H   MJob # @`B \ T1 ? H >H B \ T1 ? >B \ T1 ? H  B \ T1 ?>H >~B \ N1 ?H ~B \ N1 ? > ~B \ N1 ? > ~B \ N1 ? > ~B \ N1 ? X >X 8  (n \0 8c B \ ZDԔ?   \  `x1?0 (n KBiggest contributor 2c H \ 0޽h ? ̙33y___PPT10Y+D=' = @B +%  $$066 [$(   ~   s *(҂0   ~   s *D{0   F LS     W,x   H?     N ?S   TP16( 2    N ? S  TP26( 2    N ?S   TP36( 2 ~B   ND?  ~B   ND?  ~B   ND? ~B   ND?@ @ ~B   ND? ~B   ND?@ @    N< ?`   :24( 2   N  ?    :27( 2   N( ?   :30( 2   N ?L )  90( 2v   # #""P   3 r 1?0 K3 @`   3 r( 1?0 LP3 @`   3 r+ 1?00 K3 @`   3 rD& 1?00 LP2 @`   3 r= 1?0P0 L24 @`   3 r 1?P00 LP1 @`   3 rN 1?0P V Burst Time   @`   3 rW 1?0P SProcess @`B    `o?B    `o?PB    `o?PB   Z1?0B    `o?P0B !   `o?P0B "   `o?0B #   `o?0B $   `o?B %   `o?B &   `o?0 F -\K  '  F 6/ 8 x ( B H?r ) B N\ ?6 \  TP16( 2  * B N?. H   0޽h ? ̙33y___PPT10Y+D=' = @B +HC  oBgB@bb$A(  $ $ s *<{0  &  $ s 0e0e 0   zF N1(  $ x $B H?   $B N ?Yw  TP16( 2  $B Nh ?I  w  TP36( 2  $B Nx ?  w  TP26( 2 ~B  $B ND? % ~B  $B ND? % ~B  $B ND?  ~B  $B ND?`  ` ~B  $B ND?` ` % ~B $B ND?pN p  $B N ? &  97( 2 $B N ? &  93( 2 $B N@t ? 1&  :16( 2 $B N ?N 6&  90( 2 $B Nl ?Yw  TP46( 2 ~B $B ND?  ~B $B ND?N  ~B $B ND?`N ` ~B $B ND?PN P ~B $B ND?N  ~B $B ND?N  ~B $B ND? %  $B N, ? (  98( 2~B $B ND?p N p ~B $B ND?0 N 0 ~B $B ND? N ~B $B ND? %   $B N ? (  :12( 2~B !$B ND?pN p ~B "$B ND?0N 0 ~B #$B ND?N  z   $$# #"& G %$ 3 rP 1?R` M5.0 @` &$ 3 r 1?`R M4.0 @` '$ 3 r 1?` M2.0 @` ($ 3 r 1?` M0.0 @` )$ 3 r 1?` SArrival @` *$ 3 r 1?`R K4 @` +$ 3 rD  1? R LP4 @` ,$ 3 r 1?`R K1 @` -$ 3 r! 1? R LP3 @` .$ 3 r* 1?` K4 @` /$ 3 r` 1?  LP2 @` 0$ 3 r< 1?` K7 @` 1$ 3 rlE 1?  LP1 @` 2$ 3 rtG 1?` V Burst Time   @` 3$ 3 rW 1?  SProcess @`B 4$  `o? B 5$  `o? B 6$  `o?  B 7$  `o?B 8$  `o?B 9$  `o?  B :$  `o?B ;$  `o?  B <$  `o?B =$  `o?  B >$  `o?B ?$  `o?F M, v  @$  $ x A$B H?E p  B$B N\ ?/   TP16( 2  C$B NTb ?/ K  TP36( 2  D$B Ng ?/   TP26( 2 ~B E$B ND?d dL ~B F$B ND? U ~B G$B ND? E ~B H$B ND?@< @| ~B I$B ND?` ` U  J$B N\m ? t  94( 2 K$B Nq ? t  92( 2 L$B N0t ? 'F  :11( 2 M$B Ny ?M >L  90( 2 N$B Nw ? ,  TP46( 2 ~B O$B ND? E ~B P$B ND?~  ~B Q$B ND?`~ ` ~B R$B ND? U  S$B N ? v  95( 2~B T$B ND?p ~ p  ~B U$B ND?0 ~ 0  ~B V$B ND? ~  ~B W$B ND? U  X$B N\ ? t  97( 2~B Y$B ND?p~ p ~B Z$B ND?0~ 0 ~B [$B ND?~  ~B \$B ND? < | ~B ]$B ND?p< p|  ^$B N ?.  TP26( 2  _$B N ?. *  TP16( 2 ~B `$B ND?~   a$B N ? D  :16( 2B b$ # lDV?D HD H $ 0޽h ? ̙33y___PPT10Y+D=' = @B +   ;3P ((  (~ ( s *40   J ( C "A 2-40)  ( # l 1? ` =  C(Job Scheduler) 2  ( # l 1? e1Select a ready process and allocate the CPU to it2 22  ( # l 1?  f2These two determine the degree of multiprogramming3 23 B ( 3 rD8c? ` P B ( C xZD8c?   (  ` 1? `  =(1) 2c  (  `0;1?   =(2) 2c  (  `8|;1?r ~P =(3) 2cH ( 0޽h ? ̙33y___PPT10Y+D=' = @B +  `,<(  ,~ , s *0   ~ , s *lp{0  H , 0޽h ? ̙33y___PPT10Y+D=' = @B +h&  %%p220%(  0~ 0 s *0   ~ 0 s * {0  F P %  0 zI N    0 P `  0 N?   RP14   0 Nh?   FP2(   0 N?   FP3(    0 NX?  FP4(    0 N?  FP1(    0 N? @  FP3(    0 N?@ `  FP4(    0 N?`  FP1(   0 N?   FP3(   0 NX?   FP3(   0 N` ?   90( 2 0 N ?/ v  :20( 2 0 N ?|   :37( 2 0 N ? ?  :57( 2 0 N| ?  :77( 2 0 N  ?   :97( 2 0 N  ?  ;117( 2 0 N ?o   ;121( 2 0 N\ ? d  ;134( 2 0 N ?0   ;154( 2 0 N ? %  ;162( 2z f  0# #"&n  0 3 r% 1?f  L24 @` 0 3 rx. 1?  LP4 @` 0 3 r|7 1?f L68 @` 0 3 r) 1? LP3 @`  0 3 rI 1?f L17 @` !0 3 rLR 1? LP2 @` "0 3 rZ 1?4f L53 @` #0 3 r$d 1?4 LP1 @` $0 3 r,f 1?f4 T Burst Time   @` %0 3 rHv 1?4 QProcess @`B &0  `o?B '0  `o?  B (0  `o?4B )0  `o?ff4B *0  `o?fB +0  `o?4B ,0  `o?f4fB -0  `o?B .0  `o?ffB /0  `o? B 00  `o?ff B 10  `o? f B 20 # lDjJ? A H 0 0޽h ? ̙33y___PPT10Y+D=' = @B +  4<(  4~ 4 s *\0   ~ 4 s * 2{0  H 4 0޽h ? ̙33y___PPT10Y+D=' = @B +  8<(  8~ 8 s *0   ~ 8 s *`{0  H 8 0޽h ? ̙33y___PPT10Y+D=' = @B +  <<(  <~ < s *s20  2 ~ < s *t2{0 2 H < 0޽h ? ̙33y___PPT10Y+D=' = @B +1  XP@(  @~ @ s *t20  2 ~ @ s *H2{0 2  @ ZA, ? ))?"  H @ 0޽h ? ̙33y___PPT10Y+D=' = @B +  D<(  D~ D s *p20  2 ~ D s *02{0 2 H D 0޽h ? ̙33y___PPT10Y+D=' = @B +  H<(  H~ H s *t0  t ~ H s *t{0 t H H 0޽h ? !P3fPP3y___PPT10Y+D=' = @B +xMoSGpv9$ RxXj BTbaH 딧Nb$P/Rg(#UTKSawfw߫=y3;3~Kah@W il6}vs6Fܢ1Hgޭy&[eUJ8|vb\J|uO?7L ]{y#Ziwvg0"Lpc>@]44p쓯ú7zQ[?B4A^^P{('vIv#AD}-  OODUk [~3>?XG,{zPu%I>)eǏwt] PuE~@0GE2dYJi.ep<[ EQ1`ehkpy%u!$&5)n,.wcn5s:? 5TpOh+'0T px    $ 0<D SchedulingFabian E. BustamanteP lecture03BuFabian E. 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BustamanteFabian E. Bustamante  !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~      !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~Root EntrydO)PicturesCurrent UserSummaryInformation($UPowerPoint Document(6DocumentSummaryInformation8