Concurrent languages are Functional by Francesco Cesarini

© 1999-2017 Erlang Solutions Ltd

Concurrent Languages areFunctional

Francesco Cesarini Founder & Technical Director @ Erlang Solutions

@FrancescoC [email protected]

© 1999-2017 Erlang Solutions Ltd 2 Source: Warner Bros


Two ways to do concurrency

3

Mutable State Immutable State

Msg


© 1999-2017 Erlang Solutions Ltd 4


Y = X2-1

Immutability


Mutability

X = X2-1


Mutability

X = X2-1


Corrupt StateWith Mutability






LocalityWith Mutability

Bangalore, India

London, UK


ConnectivityWith Mutability

12

Bangalore, India

London, UK


Corrupt StateWith Immutability






LocalityWith Immutability

Bangalore, India

London, UK


ConnectivityWith Immutability

Bangalore, India

London, UK


Shared Memory

18

No Shared Memory

Msg


Two ways to do concurrency



Source: Serious Eats


Distribution


Lambdas & Closures double([H|T]) -> [H*2|double(T)]; double([]) -> [].

bump([H|T]) -> [H+1 | bump(T)]; bump([]) -> [].

map(Fun, [H|T]) -> [Fun(H)|map(Fun,T)]; map(_Fun, []) -> [].

double(L) -> map(fun(X)-> X*2 end,L). bump(L) -> map(fun(X)-> X+1 end,L).


Parallella Board Dual core ARM processor + Epiphany 16/64 core co-processor, FPGA

Raspberry Pi 2 Quad core ARM processor, GPU


From Embedded Devices…

© 1999-2017 Erlang Solutions Ltd © 1999-2017 Erlang Solutions Ltd 24

●  93 petaflops/s (November 2016)

●  40,960 Nodes, each with 2 Ivy Bridge multicores and 3 Xeon Phis

●  3,120,000 x86 cores in total

Sunway TaihuLight

Chinese National University of Defence Technology

To the Fastest Computer in the World!



Concurrency + Distribution

Immutability Concurrency Distribution




Multi-core Parallelism




Multi-core Parallelism

Scalability

Reliability


Distribution

Bangalore, India

London, UK


Distribution

Bangalore, India

London, UK


Distribution

Synchronous Asynchronous

At the Most Once Exactly Once At Least Once

Sequential Parallel



“Programming consists of overcoming two things: accidental difficulties, things which are difficult because you happen to be using inadequate programming tools, and things which are actually difficult, which no programming tool or language is going to solve.”

- Joel Spolsky

Questions?


Francesco Cesarini Founder & Technical Director @ Erlang Solutions

@FrancescoC [email protected]

Date post:	29-Jan-2018
Category:	Software
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Concurrent languages are Functional by Francesco Cesarini

Software