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7/23/2019 KTMT&HĐH.pptx
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KIẾN TRÚC MÁY
TÍNH& HỆ ĐIỀU HÀNH
Computer Architecture& Operating Systems
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7/23/2019 KTMT&HĐH.pptx
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7/23/2019 KTMT&HĐH.pptx
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th`ng sang thJc hiGn hLm DE lF li gi hGth`ng nIm trong thLnh ph<n hG iHu hLnh.
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7/23/2019 KTMT&HĐH.pptx
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7/23/2019 KTMT&HĐH.pptx
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7/23/2019 KTMT&HĐH.pptx
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nhiHu tiQn tr\nh cf thd tồn ti (L thJc hiGn c„ng mVt lRc., thut a chZ[ng tr\nh cf nhiHu Zu idm%7 Cho phŒp sE ng C;: hiGu u7 ĐBp ?ng t`t h[n y>u c<u tnh toBn cPa ngZi
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7/23/2019 KTMT&HĐH.pptx
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Đxu iq c} ph~# ph ? T„y thuVc (Lo (iGc hG iHu hLnh cf thd thJc hiGn iHu VMhi mVt tiQn tr\nh ang sE ng C;: hay Mhkng ta phnUiGt iHu V Mhkng phn ph`i li ]nonpreempti(e^ (L iHuV cf phn ph`i li ]preempti(e^.
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7 ĐiHu V cf phn ph`i li lL Midu iHu V trong f hG iHuhLnh cf thd sE ng c[ chQ ng‘t d thu hồi C;: cPa mVtti;n tr\nh ang trong trng thBi chy t?c lL tiQn tr\nhang sE ng C;: d thJc hiGn lGnh cPa m\nh. 6Wi MiduiHu V nLy hG iHu hLnh cf thd phn ph`i li C;: mVtcBch chP Vng Mhkng c<n ch cho tWi Mhi tiQn tr\nh angchy MQt thRc ho~c chuydn sang trng thBi ch bi.
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7/23/2019 KTMT&HĐH.pptx
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7/23/2019 KTMT&HĐH.pptx
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7/23/2019 KTMT&HĐH.pptx
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‰C‰S nhZng cf thd c[ chQ phn ph`i li UIngcBch sE ng ng‘t cPa ồng hồ. 5G th`ng nhngh‹a nh@ng Mhong thi gian nh‡ gi lL lZbngtE thi gian ]time uantum^ hay lBt c‘t thi gian]time slice^ cf V Li t (Li mili giy tWi (Li trKmmili giy t„y (Lo cju h\nh c thd. TiQn tr\nh sXl<n lZbt Zbc cjp C;: trong nh@ng Mhong thigian nhZ (y trZWc Mhi U ng‘t (L C;: Zbc cjpcho tiQn tr\nh MhBc. Sau y lL minh ha cho
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Thi gian ch bi trung U\nh ]# › # ›!^)=.c/ Đxu iq lu ty# t"# tr#h#8€# #htho phŒp gim thi gian ch bi trung U\nh lLiHu V Zu ti>n tiQn tr\nh ng‘n nhjt trZWc]Shortest ;rocess ‰irst • S;‰^ hay cn gi là ckng (iGc ng‘n nhjt trZWc ]Shortest œoU ‰ist^tiQn tr\nh ng‘n nhjt tiQp theo ]Shortest ;rocessNeDt^. hn trong hLng bi tiQn tr\nh cf chu M†sE ng C;: tiQp theo ng‘n nhjt d phn ph`iC;:. N;u cf nhiHu tiQn tr\nh (Wi chu M† C;: tiQptheo UIng nhau tiQn tr\nh ?ng trZWc sX Zbc
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iHu V Zu ti>n thi gian cn li ng‘n nhjt cf thi gianch bi trung U\nh nh‡ nhZng i h‡i hG iHu hLnh phiJ oBn Zbc V Li chu M† sE ng C;: cPa tiQn tr\nh.So (Wi iHu V uay (ng (iGc chuydn i tiQn tr\nhiễn ra t h[n (L o (y Mhkng t`n nhiHu thi gianchuydn i ng@ cnh.
7/23/2019 KTMT&HĐH.pptx
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c„ng y>u c<u mVt tLi nguy>n tLi nguy>n f ch cfthd phc ( mVt tiQn tr\nh ti mi thi idm. ĐdtrBnh mu thun phdi loi tr tZ[ng h t?c lL mUo rIng nQu mVt tiQn tr\nh ang sE ng tLinguy>n th\ cBc tiQn tr\nh MhBc Mhkng Zbc sE ngtLi nguy>n f. TLi nguy>n nhZ (y Zbc gi lL tLinguy>n gang ]critical resource^. Đon m{ tiQn tr\nhtrong f ch?a thao tBc truy cp tLi nguy>n nguyhidm Zbc gi lL on g}ng ]critical section^. 3>u c<u
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7/23/2019 KTMT&HĐH.pptx
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7/23/2019 KTMT&HĐH.pptx
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7/23/2019 KTMT&HĐH.pptx
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7/23/2019 KTMT&HĐH.pptx
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