Baruco 2014—

You should have been there

David Vrensk2014-09-18

Jeremy Walker

• Avoid the monorail

• Huge gem files, collisions

• Pubsub! (gem install propono)

• AWS sns sqs

• Bit.ly/baruco14

Matz: mRuby• New devices. Small, but strong CPUs,

much memory.

• Cruby not good for embedded. Too big. Too much posix.

• Jruby too much Java. JavaME is not enough java.

• Japanese gov grant 2009-2011

Matz...

• Copied lua api

• Incremental generational GC.

• C99

• MRI 1.9-compatible syntax-wise

• Sinatic—Sinatra clone

• Micro satellites! Mruby in space!

Piotr Szotkowski: Standard library

• Struct

• Yaml/store

• Heredocs in method calls

• Webrick

• Gserver (TCP)

• Enumerable#flat_map

• abbrev

• module_function

• Enum.combination

• DRb

• Ipaddr

• Rinda!

Piotr Szotkowski...

• Benchmark

• Why is stdlib Integer#prime? slower than a naive implementation?

• Read enumerable.rb, and again.

• End of line (stdlib blog posts)

Pat Shaughnessy: active record

• Generating SQL

• Executing SQL

• The b-tree algorithm

• Arel. E.F. Codd. AST. Visitor pattern.

• Lehman & Yao: efficient b-trees

• Dive deep, have fun.

Emily Stolfo: backwards compatible APIs

• Innovation and stability are at odds in the ruby community

• Reactions to breakage:

• not part of the official API

• my bad, sorry

• yank, re-release

Emily Stolfo...

• Configurability and stability are at odds

• Api wrapper vs native api

• Do 3 things:

• simple api

• clear communication

• semver

Emily Stolfo...

• Changelogs! www.keepachangelog.com

• Be nice. Tell ppl you don't support 1.8.7 even if 1.8.7 isn't supported in itself.

• Ppl avoid semver because it's holding them back. Innovation is more important to rubyists.

José Tomas Albornoz: Twitch plays Pokemon• Java robot lib to send keystrokes. Latency.

• tom7.org/mario

• Writing a new emulator. Mimey.

• Commit and learn. Conference-driven development!

• Irresponsible ruby: Too clever or interesting to deploy on your day job.

• Learned how computers work.

Leon Gersing: Keep software weird

• Meaning is derived through experience

Ryan Levick: Type safety in ruby

• Types are better than tests because math

• Compiler less likely to be buggy than your tests

• Save your tests for business logic

Lightning talks• Yorick Petersén

• Oga - new XML parser, made to be enjoyable

• Tom Stuart (not evil)

• Burrows-wheeler transform

• Philip Nash

• My code is more popular than me

• Chuck Norris bot, Vin Diesel bot

Brian Shirai: Types as premature optimisation

• Static types. We don't need them. And we're not good at them.

• Making a sandwich: What would be a purely functional recipe to make a sandwich?

Brian Shirai...

• We learn not from own failure, not from success of others, but from failure of others.

• Card trick: We're bad at types.

Brian Shirai...

• The power of interoperability: why objects are inevitable

• Messages are the core of objects.

• Let functions have types. We can handle that.

Erik Michaels-Ober: Writing fast Ruby

• Don Knuth: a 12% improvement, easily obtainable, should be done based on experience from other engineering disciplines. (December 1974)

sferik...

• Levels: design, source, build, compile, runtime

• Algos, fast ruby, build flags, all but MRI, GC malloc limit

sferik...

• Knuth again: programmers are bad at guessing what's slow.

• Benchmark

• Benchmark/ips runs a certain time instead of n iterations

sferik...

• Activesupport symbol-to-proc was slower than blocks so rails stopped using it internally. SymToProc in ruby is faster than blocks.

• Flat_map 4.5x faster than map+flatten but rubinius implemented it as map+flatten.

Jason R Clark: Spelunking in ruby

• Collecting tricks and tools

• JasonRClark.com/debug

Evan Phoenix: Services, services,

• What is micro service?

• Single data type.

• Or a single operation.

• Or logical group (email).

Evan Phoenix...

• Benefits:

• the "don't break my shit" rule.

• Separate velocity vectors.

• You can't break encapsulation on someone else's machine.

• Plenty of pitfalls

Evan Phoenix...

• Shared Model Pain. Don't share AR code between projects.

Evan Phoenix...

• Now deployment becomes a mess. Use one solution for all. Force them to use the same solution.

• Config needs to be centralised. Stop using .yml, move to env vars. 12factor rules.

Evan Phoenix...

• Do a fire drill once a month. Pretend. Check things. There will be many places to check. Practice.

• Expect failure. Gracefully degrade. Use back pressure: returning errors better than crashing.

Evan Phoenix...

• How and what. Don't argue over how x talks to y. One convention for all.

• ... But what about synchronous/asynchronous?

• How? RPC, REST, or message passing

Evan Phoenix...

• Enables multi-lang. But every new language needs the same tools as the others: logging, etc.

• Build that part first, or you won't have it when you need it.

Evan Phoenix...

• Break up when you reach the Human Cognitive Mass threshold.

• Every sufficiently complex problem domain will hit the HCM threshold.

• Team HCM is smaller than individual HCM. Because communication.

Evan Phoenix...

• Services should be the right size for your team.

• Tooling matters

• Sacred cows make the best hamburgers says Evan Phoenix.

Tom Stuart: Refactoring ruby with monads

• Book: understanding computation

• Gh/tomstuart/monads

Matt Aimonetti: Go auth urself

• story time

Evil Tom Stuart: Smalltalk, lisp, shell

• opinion time

Julian Cheal: Dancing with robots

• show time

Will watch again

• Leon Gersing

• Evan Phoenix

• (good) Tom Stuart

All of them• JEREMY WALKER—Avoid the

monorail• YUKIHIRO MATSUMOTO—mruby:

AltRuby• PIOTR SZOTKOWSKI—Standard

Library, Uncommon Uses• PAT SHAUGHNESSY—Twenty

Thousand Leagues Under ActiveRecord

• EMILY STOLFO—Release Responsibly

• JOSÉ TOMÁS ALBORNOZ—How I built my own Twitch-Plays-Pokémon

• LEON GERSING—Keep Software Weird

• RYAN LEVICK—A Dangerous Game: Safety in Ruby

• BRIAN SHIRAI—Types As Premature Optimization

• ERIK MICHAELS-OBER—Writing fast Ruby

• JASON R. CLARK—Spelunking in Ruby

• EVAN PHOENIX—Services, Services, Everywhere!

• TOM STUART—Refactoring Ruby with Monads

• MATT AIMONETTI—Go Auth Urself• EVIL TOM STUART—Smalltalk, Lisp,

Bash: Three Interesting Languages• JULIAN CHEAL—Dancing with

Robots

Retrospective

• Format (facts + opinions)

• Content

• facts

• opinions

• Level?

• Too long? Too short?

Thank you!David Vrensk

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