*Rani of Hearts-Reena Kapoor Paristan#54*AkhiyonPeTeriHuaDilYehFida - Page 2

Masooma Bukhari

@MasoomaBukhari

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Posted: 5 years ago

wese hi hm dono busy thay kam ana hua 😛

but still... i went to hostel AFTER that AT started 😲

*shooks head*

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Masooma Bukhari

@MasoomaBukhari

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Posted: 5 years ago

chalo khayr.. parhne ka time hogya he 😆

see u 🤗

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Masooma Bukhari

@MasoomaBukhari

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Posted: 5 years ago

did i post OS type definitions on AT too or was it jst buzzy's inbox 🤔

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Masooma Bukhari

@MasoomaBukhari

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Posted: 5 years ago

monolithic

carries all functionality

modular

carries minimum functionality and structure

micro kernel

:/ same as modular likha hua net pe :S

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Masooma Bukhari

@MasoomaBukhari

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Posted: 5 years ago

context switching

switching PCBs of processes

direct costs: # of cycles for store/load instructions

indirect costs: cold cache/ cache misses

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Masooma Bukhari

@MasoomaBukhari

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Posted: 5 years ago

message passing types

pipes: do it character by character

message queues: do it packet wise

message passing is form of communication between processes.. 🤔

IPC? o_O

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Masooma Bukhari

@MasoomaBukhari

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Posted: 5 years ago

data structure used by kernel

circular doubly linked list -> task list -> struct task_struct 😡

system calls happen in process ka kernel stack 😲

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Masooma Bukhari

@MasoomaBukhari

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Posted: 5 years ago

user kernel thread relationship

many to one -> ek kernel pe many threads..

adv portable

disadv ek thread i/o pe block ho to os sara process hi block kr deta he mtlb baki threads b

insights b ni hoti kernel ko apps ki

one to one -> ek kernel pe ek thread

adv ek thread block hoga to baki threads ni honge bcz kernels hi diff. hen

threads kernel ko visible hote he to sync issue ni hota

dis adv not portable

threads ko hr operation k liye os paas jana prta

many to many -> sucks 😆 no one uses it .. too complex

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Masooma Bukhari

@MasoomaBukhari

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Posted: 5 years ago

ok i cant find my pen so gonna solve it here lol

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Masooma Bukhari

@MasoomaBukhari

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+ 4

Posted: 5 years ago

threads: 6

boss worker processes in 120 ms

pipeline - each stage processes in 20 ms

how long will it take both for 10 orders?

-

boss worker = time_finish_1order * (num of orders / num of threads)

pipeline = time_finish_1order + (remaining orders * time_finish_lastOrder)

BW = 120 * (10/6) = 120 * 2 = 240 ms

Pipeline:

time_finish_1order = 6 * 20 = 120 ms

remaining orders * time_finish_last order = 9 * 20 = 180

pipeline = 120 + 180 = 300 ms

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