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High-level Concurrency
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Rob Brown
August 20, 2015
Programming
1
60
High-level Concurrency
Learn about how the actor model can hide and manage the complexities of concurrent programs.
Rob Brown
August 20, 2015
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Transcript
High%level)Concurrency ©"Robert"Brown"August"2015"@robby_brown
Overview 1. The&Problems 2. Architecture&Theory 3. Examples 4. Demo ©"Robert"Brown"August"2015"@robby_brown
The$Problems ©"Robert"Brown"August"2015"@robby_brown
Atomicity ©"Robert"Brown"August"2015"@robby_brown
Nondeterminism ©"Robert"Brown"August"2015"@robby_brown
Race%Condi+ons ©"Robert"Brown"August"2015"@robby_brown
Mutual&Exclusion ©"Robert"Brown"August"2015"@robby_brown
Dead%lock ©"Robert"Brown"August"2015"@robby_brown
The$list$goes$on... ©"Robert"Brown"August"2015"@robby_brown
Keeping'track'of'so'much'informa3on'is'hard ©"Robert"Brown"August"2015"@robby_brown
Computers*are*good*at*tracking*lots*of* informa4on ©"Robert"Brown"August"2015"@robby_brown
We#write#code#that#tests#code. We#write#code#that#generates#code. ©"Robert"Brown"August"2015"@robby_brown
Let's&use&a&system&that&lets&the&computer& manage&concurrency ©"Robert"Brown"August"2015"@robby_brown
Architecture)Theory ©"Robert"Brown"August"2015"@robby_brown
Actor&Model ©"Robert"Brown"August"2015"@robby_brown
A"universal"primi.ve"of"concurrent" computa.on. —"Defini(on"of"an"Actor1 1"Wikipedia ©"Robert"Brown"August"2015"@robby_brown
[T]he&problem&with&[OOP]&languages& is&they’ve&got&all&this&implicit& environment&that&they&carry&around& with&them. —"Joe"Armstrong3 3"Coder's"at"Work ©"Robert"Brown"August"2015"@robby_brown
You$wanted$a$banana$but$what$you$ got$was$a$gorilla$holding$the$banana$ and$the$en3re$jungle. —"Joe"Armstrong3 3"Coder's"at"Work ©"Robert"Brown"August"2015"@robby_brown
I'm$sorry$that$I$long$ago$coined$the term$"objects"$for$this$topic$because$ it$gets$many$people$to$focus$on$the lesser$idea. —"Alan"Kay2 2"Squeak"Mailing"List ©"Robert"Brown"August"2015"@robby_brown
The$key$in$making$great$and$ growable$systems$is$much$more$to$ design$how$its$modules$ communicate$rather$than$what$their$ internal$proper7es$and$behaviors$ should$be. —"Alan"Kay2 2"Squeak"Mailing"List ©"Robert"Brown"August"2015"@robby_brown
Protocol'oriented,programming, focuses,on,interac4ons,rather,than, object,hierarchies. See#WWDC#2015#Session#408 ©"Robert"Brown"August"2015"@robby_brown
Actor&Opera+ons4 1. Make'local'decisions 2. Create'other'actors 3. Send/receive'messages 4"Wikipedia ©"Robert"Brown"August"2015"@robby_brown
Warning:(Flow(Charts(Ahead5 5"XKCD"518 ©"Robert"Brown"August"2015"@robby_brown
Typical(Actor(Flow ©"Robert"Brown"August"2015"@robby_brown
Example Your%Code%as%a%Crime%Scene ©"Robert"Brown"August"2015"@robby_brown
Sequen&al)Processing ©"Robert"Brown"August"2015"@robby_brown
©"Robert"Brown"August"2015"@robby_brown
Concurrent)Processing ©"Robert"Brown"August"2015"@robby_brown
©"Robert"Brown"August"2015"@robby_brown
Parallel&Processing ©"Robert"Brown"August"2015"@robby_brown
©"Robert"Brown"August"2015"@robby_brown
©"Robert"Brown"August"2015"@robby_brown
Monad&Binding ©"Robert"Brown"August"2015"@robby_brown
©"Robert"Brown"August"2015"@robby_brown
Two$level(Aggrega-on ©"Robert"Brown"August"2015"@robby_brown
©"Robert"Brown"August"2015"@robby_brown
Interchangable,Parts ©"Robert"Brown"August"2015"@robby_brown
©"Robert"Brown"August"2015"@robby_brown
Other&Examples ©"Robert"Brown"August"2015"@robby_brown
Instagram ©"Robert"Brown"August"2015"@robby_brown
Deckset ©"Robert"Brown"August"2015"@robby_brown
LLVM6 6"LLVM"for"Grad"Students ©"Robert"Brown"August"2015"@robby_brown
Automator ©"Robert"Brown"August"2015"@robby_brown
IFTTT ©"Robert"Brown"August"2015"@robby_brown
Workflow ©"Robert"Brown"August"2015"@robby_brown
Summary 1. The&Problems 2. Architecture&Theory 3. Examples 4. Demo ©"Robert"Brown"August"2015"@robby_brown
One$Final$Thought ©"Robert"Brown"August"2015"@robby_brown
The$Main$Thread$is$a$Singleton! !!"!#!$!% ©"Robert"Brown"August"2015"@robby_brown
Demo ©"Robert"Brown"August"2015"@robby_brown
Ques%ons? ©"Robert"Brown"August"2015"@robby_brown
Resources(to(Learn(More • WWDC%2015%Session%226 • Actor%Model • Communica;ng%Sequen;al%Processes%(CSP) ©"Robert"Brown"August"2015"@robby_brown
In#Depth#Resources • MapReduce • Lambda-Architecture • Reac3ve-Streams • WWDC-2015-Session-408 •
Amdahl's-Law ©"Robert"Brown"August"2015"@robby_brown