Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst...

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Debugging Session Preview Xu Zhao University of Toronto Session: 3:50 pm - 5:10 pm, Tuesday

Transcript of Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst...

Page 1: Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst place. So if you write the code as cleverly as possible, you are, ... I both iOS and

Debugging Session Preview

Xu Zhao

University of Toronto

Session: 3:50 pm - 5:10 pm, Tuesday

Page 2: Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst place. So if you write the code as cleverly as possible, you are, ... I both iOS and

Why Care About Debugging?

I More than 50% of development time are on debugging

I Service down time is critical

Google’s blackout in 2013 caused40% drop in global Internet traffic

Amazon service down on prime day

Page 3: Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst place. So if you write the code as cleverly as possible, you are, ... I both iOS and

Debugging is Hard

Debugging is twice as hard as writing the code in the firstplace. So if you write the code as cleverly as possible, you are,by definition, not smart enough to debug it.

– Brian Kernighan

Page 4: Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst place. So if you write the code as cleverly as possible, you are, ... I both iOS and

Topics of Tomorrow’s Papers

Speedup Failure Resolution

Bug localization Identify the energy hotspot

Performance debugging Cluster-fueled debugger

Page 5: Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst place. So if you write the code as cleverly as possible, you are, ... I both iOS and

I Quick service recovery by reverting the buggy commit

Traditional Debugging

CollectInformation

Understanding FailureFixingBug

DeployFix

Orca

CollectInformation

LocateBuggy

Commit

Revert toPre-bugVersion

Page 6: Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst place. So if you write the code as cleverly as possible, you are, ... I both iOS and

I Quick service recovery by reverting the buggy commit

Traditional Debugging

CollectInformation

Understanding FailureFixingBug

DeployFix

Orca

CollectInformation

LocateBuggy

Commit

Revert toPre-bugVersion

Page 7: Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst place. So if you write the code as cleverly as possible, you are, ... I both iOS and

I Power is the most contraining resource on mobile devicesI both iOS and Android provide following user interfaces

Page 8: Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst place. So if you write the code as cleverly as possible, you are, ... I both iOS and

I Power is the most contraining resource on mobile devicesI Which part of the application is the energy hotspot?

I Breakdown the app into basic execution units calledapplication tasks.

ObservationEnergy consuming pattern can be very different even for similarapplication tasks.

Example: energy consumption breakdown of two IM apps

Other App TasksUI Task

UI Task Other App Tasks

Page 9: Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst place. So if you write the code as cleverly as possible, you are, ... I both iOS and

Key Question

I Where is the bottleneck?

A

B

Disk

f1( )

f2( )

Idle

wait B

wait Disk

Disk write

Page 10: Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst place. So if you write the code as cleverly as possible, you are, ... I both iOS and

Key Question

I Where is the bottleneck?

A

B

Disk

f1( )

f2( )

Idle

wait B

wait Disk

Disk write

On-CPU Analysis: does not reveal the blocking pattern

Page 11: Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst place. So if you write the code as cleverly as possible, you are, ... I both iOS and

Key Question

I Where is the bottleneck?

A

B

Disk

f1( )

f2( )

Idle

wait B

wait Disk

Disk write

Off-CPU Analysis: result could be misleading

Page 12: Debugging Session Preview - USENIX · Debugging is twice as hard as writing the code in the rst place. So if you write the code as cleverly as possible, you are, ... I both iOS and

Key Question

I Where is the bottleneck?

A

B

Disk

f1( )

f2( )

Idle

wait B

wait Disk

Disk write

wPerf: correctly identify bottlenecking wait events

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Highlights

I The best way to understand a failure is to replay it

I First distributed deterministic replay tool

I Debugging distributed systems as easy as GDB

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Conclusion

Attend the 3:50pm session on Tuesday!


Novell Corporate Presentation Template 2007 - blue– debugging resource virtualization (debug regs as well as related MSRs, likewise for various non-debugging MSRs) – up-merges

Novell Corporate Presentation Template 2007 - blue– debugging resource virtualization (debug regs as well as related MSRs, likewise for various non-debugging MSRs) – up-merges

Cleverly compact inkjet printer - Brother

Cleverly compact inkjet printer - Brother

“Debugging is twice as hard as writing the code in the ...

“Debugging is twice as hard as writing the code in the ...

Debugging Linux Applications - UNAMmmc.geofisica.unam.mx/cursos/femp/CyC++/Debugging... · Debugging Debugging is a methodical process of finding and reducing the number of bugs,

Debugging Linux Applications - UNAMmmc.geofisica.unam.mx/cursos/femp/CyC++/Debugging... · Debugging Debugging is a methodical process of finding and reducing the number of bugs,

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A System for Debugging Taxonomies and their Alignmentsbugging the is-a structure of a fundamental kind of ontologies, i.e., taxonomies, as well as the debugging of the mappings between

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Motivation Debugging isunavoidableand a ... and Debugging | Debugging Prof. Dr. Peter Thiemann Universitat Freiburg 09.07.2009 Motivation Debugging isunavoidableand a majoreconomicalfactor

Motivation Debugging isunavoidableand a ... and Debugging | Debugging Prof. Dr. Peter Thiemann Universitat Freiburg 09.07.2009 Motivation Debugging isunavoidableand a majoreconomicalfactor

05 6108 ch03 8/9/04 11:27 AM Page 57 Debugging 3vig.prenhall.com/samplechapter/0672326108.pdf · Debugging 3 “Debugging is twice as hard as writing the code in the first place.

05 6108 ch03 8/9/04 11:27 AM Page 57 Debugging 3vig.prenhall.com/samplechapter/0672326108.pdf · Debugging 3 “Debugging is twice as hard as writing the code in the first place.

Assembly-Level Debugging · 2019. 6. 24. · Assembly-Level Debugging •Known in Visual Studio as Address-Level Debugging, and provide access to: •Memory windows •Disassembly

Assembly-Level Debugging · 2019. 6. 24. · Assembly-Level Debugging •Known in Visual Studio as Address-Level Debugging, and provide access to: •Memory windows •Disassembly

T ODAY ’ S Q UOTE “Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are–by.

T ODAY ’ S Q UOTE “Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are–by.

Eine Kleine Naughtmusik: How Nefarious Nonartists Cleverly Imitate ...

Eine Kleine Naughtmusik: How Nefarious Nonartists Cleverly Imitate ...

Everyone knows that debugging is twice as hard as writing ... · PDF fileEveryone knows that debugging is twice as ... Brian W. Kernighan and P. J. Plauger The Elements of Programming

Everyone knows that debugging is twice as hard as writing ... · PDF fileEveryone knows that debugging is twice as ... Brian W. Kernighan and P. J. Plauger The Elements of Programming

Linux Kernel Debugging - Univerzita Karlova · Linux Kernel Debugging. Advanced Operating Systems 2018/2019 Debugging 2 Agenda – Debugging Scenarios Debugging during individual

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Part 6 - Primezoneprimezone.edu.au/resources/pdf/Cleverly Used Genes Activity.pdf · Evolution and Heredity • Activity 6.4 Cleverly Used Genes e 10 Canola Canola is a member of

Part 6 - Primezoneprimezone.edu.au/resources/pdf/Cleverly Used Genes Activity.pdf · Evolution and Heredity • Activity 6.4 Cleverly Used Genes e 10 Canola Canola is a member of

Cleverly devised tales

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“Debugging is twice as hard as writing the code in the ... · TODAY’S QUOTE “Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code

“Debugging is twice as hard as writing the code in the ... · TODAY’S QUOTE “Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code

arXiv:1902.03520v1 [cs.SE] 10 Feb 2019 · 2019-02-12 · Swarm Debugging: the Collective Intelligence on Interactive Debugging 3 this information as context for their debugging. Thus,

arXiv:1902.03520v1 [cs.SE] 10 Feb 2019 · 2019-02-12 · Swarm Debugging: the Collective Intelligence on Interactive Debugging 3 this information as context for their debugging. Thus,

Malnutrition Prevention Programme Salford Kirstine Farrer Sarah Cleverly.

Malnutrition Prevention Programme Salford Kirstine Farrer Sarah Cleverly.

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Debugging Chapter 23. Outline Overview of Debugging Finding a Defect Fixing a Defect Psychological Considerations in Debugging Debugging Tools—Obvious.

Debugging Chapter 23. Outline Overview of Debugging Finding a Defect Fixing a Defect Psychological Considerations in Debugging Debugging Tools—Obvious.