Project 2 Soumya Basu Department of Computer Science Cornell - - PowerPoint PPT Presentation

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Project 2 Soumya Basu Department of Computer Science Cornell - - PowerPoint PPT Presentation

Aug 01, 2023 474 likes •1.12k views

Project 2 Soumya Basu Department of Computer Science Cornell University September 18, 2015 Administrivia Administrivia Project 2 is due on September 30 Administrivia Project 2 is due on September 30 Ground Truth First Hint First

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SLIDE 1

Project 2

Soumya Basu Department of Computer Science Cornell University September 18, 2015

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SLIDE 2

Administrivia

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SLIDE 3

Administrivia

  • Project 2 is due on September 30
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SLIDE 4

Administrivia

  • Project 2 is due on September 30
  • Ground Truth
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SLIDE 5

First Hint

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SLIDE 6

Fix Project 1 Bugs!!! First Hint

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SLIDE 7

Purpose

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SLIDE 8

Purpose

  • Made a major assumption in Project 1…
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SLIDE 9

Purpose

  • Made a major assumption in Project 1…
  • Threads behave nicely and give up the CPU
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SLIDE 10

Purpose

  • Made a major assumption in Project 1…
  • Threads behave nicely and give up the CPU
  • Issues?
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SLIDE 11

Purpose

  • Made a major assumption in Project 1…
  • Threads behave nicely and give up the CPU
  • Issues?
  • Selfish Threads
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SLIDE 12

Purpose

  • Made a major assumption in Project 1…
  • Threads behave nicely and give up the CPU
  • Issues?
  • Selfish Threads
  • Potential Security risks
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SLIDE 13

The Three Parts

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SLIDE 14

The Three Parts

  • Specs say 5…
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SLIDE 15

The Three Parts

  • Specs say 5…
  • Start Receiving Clock Interrupts
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SLIDE 16

The Three Parts

  • Specs say 5…
  • Start Receiving Clock Interrupts
  • Add Alarms
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SLIDE 17

The Three Parts

  • Specs say 5…
  • Start Receiving Clock Interrupts
  • Add Alarms
  • Makes Thread Sleeping Possible
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SLIDE 18

The Three Parts

  • Specs say 5…
  • Start Receiving Clock Interrupts
  • Add Alarms
  • Makes Thread Sleeping Possible
  • Why do we care?
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SLIDE 19

The Three Parts

  • Specs say 5…
  • Start Receiving Clock Interrupts
  • Add Alarms
  • Makes Thread Sleeping Possible
  • Why do we care?
  • Multilevel feedback queue scheduler
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SLIDE 20

Receiving Clock Interrupts

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SLIDE 21

Receiving Clock Interrupts

  • KISS: Keep It Simple Student!
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SLIDE 22

Receiving Clock Interrupts

  • KISS: Keep It Simple Student!
  • Difference between:
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SLIDE 23

Receiving Clock Interrupts

  • KISS: Keep It Simple Student!
  • Difference between:
  • Testing/Coding
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SLIDE 24

Receiving Clock Interrupts

  • KISS: Keep It Simple Student!
  • Difference between:
  • Testing/Coding
  • Final Product
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SLIDE 25

Receiving Clock Interrupts

  • KISS: Keep It Simple Student!
  • Difference between:
  • Testing/Coding
  • Final Product
  • Changing Clock Period, Print Statements, etc.
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SLIDE 26

Alarms

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SLIDE 27

Alarms

  • Performance matters!
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SLIDE 28

Alarms

  • Performance matters!
  • How long does it take to find an element in your

Project 1 queue?

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SLIDE 29

Alarms

  • Performance matters!
  • How long does it take to find an element in your

Project 1 queue?

  • Is that good enough?
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SLIDE 30

Scheduling

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SLIDE 31

Scheduling

  • Let’s take stock of where we are…
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SLIDE 32

Scheduling

  • Let’s take stock of where we are…
  • You have an OS
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SLIDE 33

Scheduling

  • Let’s take stock of where we are…
  • You have an OS
  • Many Threads are Running
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SLIDE 34

Scheduling

  • Let’s take stock of where we are…
  • You have an OS
  • Many Threads are Running
  • Now forcing them to give up the CPU
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SLIDE 35

Scheduling

  • Let’s take stock of where we are…
  • You have an OS
  • Many Threads are Running
  • Now forcing them to give up the CPU
  • How do we pick who’s next?
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SLIDE 36

Round Robin

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SLIDE 37

Round Robin

1

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SLIDE 38

Round Robin

1 2

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SLIDE 39

Round Robin

1 2 3

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SLIDE 40

Round Robin

1 2 3 4

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SLIDE 41

Round Robin

1 2 3 4

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SLIDE 42

Round Robin

1 2 3 4

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SLIDE 43

Round Robin

1 2 3 4

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SLIDE 44

Round Robin

1 2 3 4

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SLIDE 45

Round Robin

2 3 4

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SLIDE 46

Round Robin

2 3 4 5

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SLIDE 47

Round Robin

2 3 4 5

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SLIDE 48

Round Robin

2 3 4 5

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SLIDE 49

Multilevel Queue

Highest Lowest

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SLIDE 50

Multilevel Queue

Round Robin Highest Lowest

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SLIDE 51

Multilevel Queue

Round Robin Round Robin Highest Lowest

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SLIDE 52

Multilevel Queue

Round Robin Round Robin Round Robin Highest Lowest

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SLIDE 53

Multilevel Queue

Round Robin Round Robin Round Robin Round Robin Highest Lowest

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SLIDE 54

Multilevel Queue

Round Robin Round Robin Round Robin Round Robin Highest Lowest

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SLIDE 55

Multilevel Queue

Round Robin Round Robin Round Robin Round Robin Highest Lowest

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SLIDE 56

Multilevel Queue

Round Robin Round Robin Round Robin Round Robin Highest Lowest

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SLIDE 57

Multilevel Queue

Round Robin Round Robin Round Robin Round Robin Highest Lowest

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SLIDE 58

GDB (Gnu DeBugger)

Demo

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SLIDE 59

GDB (Gnu DeBugger)

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SLIDE 60

GDB (Gnu DeBugger)

  • Many good guides out there for GDB!
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SLIDE 61

GDB (Gnu DeBugger)

  • Many good guides out there for GDB!
  • Here’s a good one that’s pretty short:
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SLIDE 62

GDB (Gnu DeBugger)

  • Many good guides out there for GDB!
  • Here’s a good one that’s pretty short:
  • http://www.cabrillo.edu/~shodges/cs19/progs/

guide_to_gdb_1.1.pdf

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SLIDE 63

GDB (Gnu DeBugger)

  • Many good guides out there for GDB!
  • Here’s a good one that’s pretty short:
  • http://www.cabrillo.edu/~shodges/cs19/progs/

guide_to_gdb_1.1.pdf

  • You might also need this (Hint hint):
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SLIDE 64

GDB (Gnu DeBugger)

  • Many good guides out there for GDB!
  • Here’s a good one that’s pretty short:
  • http://www.cabrillo.edu/~shodges/cs19/progs/

guide_to_gdb_1.1.pdf

  • You might also need this (Hint hint):
  • https://sourceware.org/gdb/onlinedocs/gdb/

Signals.html