9. 2. Bulej

[mathemage]

Pokud jste si dneska nesedli do sudych lavic kvuli rozestupu, tak mate automaticky minus 10 bodu, tak bacha na to

Quiz:
-algoritmus ma v programu vliv na... (pocet vstupne/vystupnich operaci)
-bankeruv algoritmus (dynamicke vyhybani se splneni vsech Coffmanovych podminek najednou)
-Mooruv zakon (~exponencialni rust integrace tranzistoru v case) - to znamena neco jako " #tranzistoru se kazdym rokem zdvojnasobi"
-pagefault = (~neexistence mapovani z virt. do fyz. adresy)
-jak lze snizit compulsory/cold miss (nelze pomoci strukturalnich uprav cache)

-monitor = (datova struktura s internim zamkem pro vzajemne vylouceni a operaci wait, ktera volajici proces uspi a uvolni zamek, ktery drzel)
-starvation, cesky vyhladoveni = (~proces ceka prilis dlouho na prostredek)
-datovy hazard = (~instrukce vyzaduje k vypoctu data, ktera jeste nejsou k dispozici)
-TLB = (asociativni cache pro urychleni prekladu z virtualni adresy na fyzickou)
-Programmed I/O prenos... (vykazuje nizsi latenci (oproti DMA) pri malych prenosech (radove Byty) )

Melo by to byt spravne (mel jsem 10 z 10 bodu, tak by tam nemela byt zadna chybka

[mathemage]

2. cast:

1) superskalarni procesor s dynamickym planovanim? Motivace, princip funkce, z ceho se sklada? Jaky muze mit problemy a jak resit?

2) K cemu, proc a jak se pouziva strankovani? K cemu a jak se pouziva TLB? Jak souvisi s context switch?
+nejaky to pocitanicko, abychom nemeli nahodou moc volnyho casu
52 b VA, 32 KiB stranka, asi 48 b FA -> popsat (s obr.) jak tam bude strankovani...mne vyslo (nerucim za to), 4-urovn. str. (1+12+12+12=VPN), offset 15 b
dale (asi k vyse nalezenemu strankovani, nebylo to tam vyslovne napsany) #pagefaultu u 4B instrukce presunu 131200 KiB dat - ted jsem si uvedomil, ze jsem tam udelal hroznou ptakovinu : 131200:32 = 400 zapomnel jsem dopsat 1 uprostred

3) rozdil mezi procesy a vlakny z pohledu OS, jak s tim souvisi context switching, co musi pro to podporovat OS a HW

4) co je to sbernice, obecny prubeh, vymyslet si priklad nejakeho konkr. prubehu, synchronni a asynchronni (rozdil), co a k cemu je arbitrace - jak uskutecneno (popsat konkr. mechanismus)

Je to hodne jen nacrtek, co bylo za otazky - jsem furt vyrizenej z ty 2ky, co jsem z toho dostal (skoda, ze tu misto smiley nejde dat buley) - ale az dostanu nascanovanou opravenou pisemku, tak to zadani vic "zkraslim"

[kralik]

-algoritmus ovlivnuje v programu... (pocet vstupne/vystupnich operaci)

Jseš si jistej, že toto je dobře?
Taky tam totiž byla možnost "počet instrukcí k vykonání" (nebo tak nějak), kterou jsem dal já a přijde mi správná. Co má algoritmus společnýho s I/O operacemi?

Mimochodem, zadání "algoritmus ovlivnuje v programu ..." je dvouznačné: není jasný, co je větný podmět a co předmět

[mathemage]

-algoritmus ovlivnuje v programu... (pocet vstupne/vystupnich operaci)

Jseš si jistej, že toto je dobře?
Taky tam totiž byla možnost "počet instrukcí k vykonání" (nebo tak nějak), kterou jsem dal já a přijde mi správná. Co má algoritmus společnýho s I/O operacemi?

No, ono totiz jsou ruzny verze otazek s ruznymi moznostmi a ruznymi spravnymi moznostmi. Bulej ma ve slidech

Algoritmus -> Počet příkazů ve zdrojovém textu a počet V/V operací

viz http://d3s.mff.cuni.cz/teaching/princip ... 2-uvod.pdf slide #7

Takze spravne jsou obe moznosti, jenom ja jsem mel v moznostech jen 1 z nich

[mathemage]

Jo, a takovej prikladek, kde tahle zavislost je krasne videt:

SelectSort = cteni/zapisu
QuickSort = cteni/zapisu

[kralik]

Jo, a takovej prikladek, kde tahle zavislost je krasne videt:

SelectSort = cteni/zapisu
QuickSort = cteni/zapisu

To jsou ale přístupy do paměti. Ne I/O.
Ale jako jinak jo, chápu co se tím myslí.

[mathemage]

Jo, a takovej prikladek, kde tahle zavislost je krasne videt:

SelectSort = cteni/zapisu
QuickSort = cteni/zapisu

To jsou ale přístupy do paměti. Ne I/O.
Ale jako jinak jo, chápu co se tím myslí.

Ale tak muze se to cist a zapisovat do souboru, coz uz jsou vstupni/vystupni operace...

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