RubyConfTH conference notes

By Selena Small & Michael Milewski

December 15, 2022

RubyConfTH

2 years in the making since 2019 RubyConfTH

Day 1 Friday 9th December

https://rubyconfth.com/schedule/#day-1

Keynote: A Beginner’s Guide to Puma Internals (Slides) Nate is a Rails performance expert. He’s the author of several books, and he also maintains the Puma web server project. Nate Berkopec @nateberkopec

OSS - Rails to get best review of your code
lazyness - get others to do the work for me
maintainers - “build an army of nerds”
most people here have NOT contributed to OSS
hump for most is they are intimidated
Overview of project goals and approaches
- details HTTP & TCP
- Puma allows Rack Apps to run
- Puma is the interface between Rack and Socekt data stream
- Pre-foring - fors child processes
- The threadpool - is the special sauce of Puma over competitors
- main thing to allow GVL (Global VM Lock) & wait for I/O
- Reactor in Ruby 3
- more throughput for similar memory resources - this is the difference from servers like Unicorn - this is the reason to use Puma, if this is your usecase use Puma
- Unicorn needs buffering as has no reactor and use nginx or apache
- CLOC - count lines of project
- use own mini_ssl - originally for performand, plan is to get rid of it, still uses OpenSSL under the covers
- uses parser from Mongrel
- Ragel parser lib
- Java/C code in /ext - this is where most OSS help is needed
- IO.select is used to accept connections on Socket - you can see what it does, “it’s in the name”
- brew intall ragel, simple to get up and running
- tags to get started with
  - contrib-wated - great first thing
  - needs-repro - reproducible bug
  - docs - can do “non code contributions”
  - PR review comments on any PR
  - bug-fix
  - finally features
  - Good OSS strategy
- - wroking with ruby core?? can? Rack speck Sockets
- Chris Seeaton memorial
  - plain language academic
  - infinite patience
  - mission to make languages fast

A Rails performance guidebook: from 0 to 1B requests/day Cristian is a software engineer in love with Ruby. He has been working with Rails since the release of Rails 3, more than 10 years ago. Currently, he leads performance optimization efforts at Zendesk as a Group Tech Lead. Cristian Planas @crplanas

talk on scaling zendesk
gems like Devise give you everything Authentication - a fress lunc
unfrotunately ActiveScale does not exist
scaling is hard - problem left for the developer

2x number of zendesk tikcets as people on earth
3TB for tickets, biggest table 60 TB
use monitoring (important) and error budgets - often for latency and uptime
DB query performance
- db indexes
- sharding
- anti pattern greedy select - fetch all by default
caching - write cache & DB together
tech that tempts us to misuse them - we should learn
cold storate
- create escalator object
- move to cheaper storage

Hanami 2: New Framework, New You Tim is a core team member of Hanami, dry-rb and rom-rb, and a Principal Engineer at Buildkite. He’s been writing Ruby for over 20 years and still loves it! He works to bring the joy of Ruby to the experience of writing real, maintainable apps of all shapes and sizes. Tim Riley @timriley

good intro to getting started with hanami

Megaruby - mruby/c on Sega Mega Drive Yuji is a software developer based in Adelaide, South Australia. He is originally from Tokyo, Japan. He used to be a Windows desktop application developer until he discovered Ruby. Yuji Yokoo @yujiyokoo

a great demo of what can be done. SOunds like a lot of mruby needs to be cut down to make this work. There are other projects out there like esp32 ruby etc. Finally a game of wordle

Roasting the Duck - A talk about Ruby and types Paolo Perrotta is the author of “Metaprogramming Ruby” and “Programming Machine Learning”. He’s been coding for most of his life, ranging from embedded to enterprise software, computer games, and web apps. He lives in Bologna, Italy. Paolo Perrotta @nusco

overview of how to use RBS files to add typing in ruby 3.1

Scaling Ruby with JRuby (Slides) Charles works on JRuby and JVM language technologies at Red Hat. Charles Oliver Nutter @headius

State of the union of how jRuby is going - it’s fast and good for applications where it can warm up

10x your teamwork through pair programming Michael is a developer keen on the people side of things. He loves pairing, and in particular with people new to writing software. He especially likes driving software out with tests and directing the evolution of the design. In his spare time he is busy camping with his 4 kids. Michael Milewski @saramic Selena is a full-stack lead engineer at Fresho in Melbourne Australia who is particularly passionate about TDD. As a self-taught coder with a background in management, she is well-equipped to mentor others. In her spare time, she is a nak muay ying, a professional kickboxer. Selena Small @selenasmall88

That’s us

Why I choose Phoenix Elixir developer, former Ruby dev for over a decade. Freelancer, streaming at https://www.twitch.tv/Elixir_Bytes. Podcasting about freelancing for software devs at https://dreamclients.io Aaron Cruz @mraaroncruz

overview

Keynote: The Ecstatic Organisation Siddharth is the CTO of InVideo. He has been a Ruby developer for fifteen years and has also been an investment banker and musician. Siddharth Sharma @svs

be ecstatic in what you do

Offical RubyConfTH Party

Hallway track RubyConfTH

1 people to ruby conf th with matz head cutout

Day 2 Saturday 10th December

https://rubyconfth.com/schedule/#day-2

Keynote: Ruby & JVM: A (JRuby) Love Story Yarden is a Software Engineer at Rookout, where you can find her in the office jumping between 6 different programming languages a day. She loves learning about new technology, creating iOS apps and making everything she can automated. Yarden Laifenfeld @YardenLaif

non breaking breakpoints
Rookout - lilve debugger - https://www.rookout.com/
force_ruby_platform true
supports Java & Ruby
Rookout is a gem
```
gem install rookout
```
TracePoints - is a ruby API for debugging
Jruby behind in TracePoints API
cannot specifiy line
use JavaAgent instrumentationAPI instead

On making your Rails App more transparent Stephan is working as a Software Developer at NEW WORK SE! When not working he’s traveling with his family, hiking or sailing. Stephan Eberle @stephaneberle

transparent rails
Open telemetry
- look at network
- latency over time
- based on Google Daper paper
logs are without context
Open Telementry
- trace spans
  - a unit of work
- also metrics
- statsd used for metrics or prometeous
Jaeger UI to connect a UI
instances inside DataDog and Sentry
are similar
zipkin
Jager UI
sentry - can it read this
use with multi services
talk to lots of external providers
can instruemnt a rails monolith app
it might be already in DataDog
OpenTelementry on github

GitOps: The Single source of truth Audy’s background is as a backend developer, then he’s focused on SysAdmin/DevOps for the last 8 years. The guy who gets excited when talking about cloud technology and container orchestration! Thatthep Vorrasing @amaudy

CI/CD in gitlab
github actions are similar but enterprisy and cost
Jenkins and Bitbucket are also competitors
kubeseal - see Mgmt
hashi corp valut

Dealing With A Project’s Complexity In A Changing Environment Anita is a self-learner who entered the Ruby world in 2013 as a backend developer. Since then, she has started a master’s degree in psychology. Initially a hobby, with time, psychology turned into a valuable experience that helped her transition to a managerial path in IT. Anita Jaszewska @anita_jaszewska

dealing with issues
5 states we go through and how we deal with it
Tips
- “I” statement of feeling
- ask questions
- focus on risks & solutions

Dissecting Rails - a different approach to learning Rails Ratnadeep (rtdp), is a software craftsman, an entrepreneur and work with Ruby for the past 13 years. He runs a Rails consulting company BetaCraft Technologies. Earlier he was a digital nomad and changed his location every few weeks, coding Ruby and exploring places. Ratnadeep Deshmane @rtdp

Ruby-vernat translated ruby
RTDP - digital nomad
Rails vs Ruby
learn the parts
- rake
- rack
- ActiveSupport
- hash_with_indifferent_access gotchas
- ActiveRecord
- ActiveModel
- ActiveMailer - running as standalone mailer
- ActiveJob
- others are too intertwind depnedencies on the rest of rails to run individually: ActionCable, ActionVeiew, ActionController - these are better run inside rails
- DSLs in rails/ruby - RSpec, Routes
- Routes: sinatroa/hanami/Roda better for
- templates: ERB
- dissecting-rails book/site

Roda: Simplicity, Reliability, Extensibility, Performance (Slides) Jeremy Evans is a Ruby committer who focuses on fixing bugs in Ruby. He the lead developer of the Sequel database library, the Roda web toolkit, the Rodauth authentication framework, and many other Ruby libraries. He is the author of “Polished Ruby Programming”. Jeremy Evans @jeremyevans0

Roda - routing tree pattern matcing
actions driving routing makes it simpler, can also run any code in the middle
2xfaster and 1/3lessmemory as prod re-write of rails
Killer feature for auth
frozen application
anti_pollution of namesapce and methods
100% line and branch coveraate
CSRF is better
lot’s of plugins and they are all better

Take away: Definitely worth a try. Certainly seems like this is a viable option for projects that need most of the power of rails but in a different lighterweight framework. Would be nice to play with the routing ideas as well as check out some of the alternative plugins like Shine?

Processing data: Ruby or SQL? (Slides) Nerd, cyclist, and blogger. Jônatas is a pair programming evangelist, Vim editor user and enthusiast. Jônatas Paganini @jonatasdp

mostly sat and listend to this one. certainly seems like I would want to re-run some of my experiments on this

Refactoring for Rails - using deodorant to prevent code smells and a shower from time to time to eliminate the most persistent ones (Slides) Rodrigo works with development since 1997, have worked with many languages and platforms before falling in love with Ruby and now has the objective to help developers to use the best tools for each job so they can solve hard problems, with less bugs and have more free time. Rodrigo Urubatan Ferreira Jardim @urubatan

missed this one but got an image

and the binary on the 💩 above …

[
  0b01100011, 0b01101111,
  0b01100100, 0b01100101,
  0b00100000, 0b01110011,
  0b01101101, 0b01100101,
  0b01101100, 0b01101100,
].map(&:chr).join

"code smell"

Keynote: YJIT’s Three Languages: the Fun of Code that Writes Code Noah spent many years charting exactly how fast Ruby is for various tasks, and continues this work at speed.yjit.org. On the YJIT team, he bothers younger, more vigorous programmers with questions like, “would you say five warmup iterations are enough if we set this parameter?” Noah Gibbs @codefolio

amazing work on an improved Just In Time optimiser

needs some warm up time
as an example of concatinationg strings, a 30th « 6(int) would break the optimiastion as would different string encoding
BootSnap preparse bytecode to disk

resources link https://codefol.io/speaking/rubyconfth2022/

also some recent benchmarks https://speed.yjit.org/

attempted with

cat a.rb

  ary = ""
  10_000_000.times do
    ("a".."z").each do |letter|
      ary << letter
    end
  end

ruby --yjit a.rb  21.36s user 0.27s system 98% cpu 21.922 total
ruby --yjit a.rb  21.78s user 0.29s system 98% cpu 22.376 total
ruby --yjit a.rb  21.42s user 0.30s system 98% cpu 22.022 total

ruby a.rb         21.36s user 0.28s system 98% cpu 21.942 total
ruby a.rb         21.37s user 0.29s system 98% cpu 21.953 total

the wrap

Hallway track RubyConfTH