Micro Performance Improvements (Short Version)

Small Ruby and Rails code improvements you can do to have high performance in your application.

Transcript

1. Micro Performance Improvements RailsConf, April 2017
2. Ernesto Tagwerker @etagwerker Founder & Software Developer at Ombu Labs
3. Best Practices 3
4. https://github.com/bbatsov/ruby-style-guide
5. https://speakerdeck.com/sferik/writing-fast-ruby
6. Bad Code vs. Good Code 6
7. # Bad HOUR_6 = Time.parse("2000-01-01 06:00:00 UTC") # Good HOUR_6 = Time.at(946685160).utc
8. $ bundle exec ruby benchmarks/time/parse_vs_at.rb Ruby version: 2.3.3 Warming up -------------------------------------- Time.parse 3.287k i/100ms Time.at 66.086k i/100ms Calculating ------------------------------------- Time.parse 34.052k (± 3.2%) i/s - 170.924k in 5.024737s Time.at 842.576k (± 2.2%) i/s - 4.230M in 5.022207s Comparison: Time.at: 842576.2 i/s Time.parse: 34051.9 i/s - 24.74x slower
9. # OK phone = Hash.new(number: number) phone[:number] # Better Phone = Struct.new(:number) phone = Phone.new(number) phone.number
10. $ bundle exec ruby benchmarks/struct_vs_hash.rb Ruby version: 2.3.3 Warming up -------------------------------------- struct 22.148k i/100ms hash 4.688k i/100ms Calculating ------------------------------------- struct 240.460k (± 2.7%) i/s - 1.218M in 5.069592s hash 47.926k (± 3.9%) i/s - 243.776k in 5.094413s Comparison: struct: 240459.9 i/s hash: 47926.1 i/s - 5.02x slower
11. # Bad Post.select(:id).map(&:id) # Good Post.pluck(:id)
12. $ bundle exec rake benches:pluck_vs_map Ruby version: 2.3.3 Warming up -------------------------------------- map(&:id) 11.000 i/100ms pluck(:id) 80.000 i/100ms Calculating ------------------------------------- map(&:id) 124.205 (±11.3%) i/s - 616.000 in 5.026999s pluck(:id) 807.127 (± 2.0%) i/s - 4.080k in 5.057062s Comparison: pluck(:id): 807.1 i/s map(&:id): 124.2 i/s - 6.50x slower
13. https://github.com/ombulabs/benches/ 13
14. Resources 14
15. 15 https://speakerdeck.com/etagwerker/micro- performance-improvements https://github.com/evanphx/benchmark-ips https://github.com/evanphx/benchmark.fyi
16. Thank you! @etagwerker 16