bench_strftime.rb

# frozen_string_literal: true

require 'benchmark/ips'
require 'logger'

puts RUBY_DESCRIPTION

logger = Logger.new("/dev/null")

time = Time.now

Benchmark.ips do |x|
  x.config(:time => 30, :warmup => 30)

  x.report('Time.now.strftime("%Y-%m-%dT%H:%M:%S.%6N")') do
    time.strftime("%Y-%m-%dT%H:%M:%S.%6N")
  end

  x.report('Time.now.strftime("%Y-%m-%d")') do
    time.strftime("%Y-%m-%d")
  end

  x.report('Time.now.strftime("%Y-%m-%d %H:%M:%S")') do
    time.strftime("%Y-%m-%d %H:%M:%S")
  end
  
  x.report('Time.now.strftime("%a, %d %b %Y %H:%M:%S.%9N")') do
    time.strftime("%a, %d %b %Y %H:%M:%S.%9N");
  end
  
  x.report('Logger#add') do
    logger.add(Logger::DEBUG, "benchmark a logger")
  end

  x.report('Logger#info') do
    logger.info("literally just something")
  end
end

results.md

JRuby 9.3.1.0

jruby 9.3.1.0 (2.6.8) 2021-10-13 2e01e7199d OpenJDK 64-Bit Server VM 25.242-b08 on 1.8.0_242-b08 +jit [linux-x86_64]
Warming up --------------------------------------
Time.now.strftime("%Y-%m-%dT%H:%M:%S.%6N")
                        38.882k i/100ms
Time.now.strftime("%Y-%m-%d")
                        60.857k i/100ms
Time.now.strftime("%Y-%m-%d %H:%M:%S")
                        39.331k i/100ms
Time.now.strftime("%a, %d %b %Y %H:%M:%S.%9N")
                        30.769k i/100ms
          Logger#add    15.644k i/100ms
         Logger#info    15.224k i/100ms
Calculating -------------------------------------
Time.now.strftime("%Y-%m-%dT%H:%M:%S.%6N")
                        358.261k (± 1.8%) i/s -     10.770M in  30.072651s
Time.now.strftime("%Y-%m-%d")
                        691.334k (± 2.1%) i/s -     20.752M in  30.031624s
Time.now.strftime("%Y-%m-%d %H:%M:%S")
                        430.898k (± 1.9%) i/s -     12.940M in  30.040652s
Time.now.strftime("%a, %d %b %Y %H:%M:%S.%9N")
                        328.948k (± 1.9%) i/s -      9.877M in  30.037065s
          Logger#add    164.153k (± 2.2%) i/s -      4.928M in  30.036509s
         Logger#info    157.895k (± 2.2%) i/s -      4.735M in  30.002263s

JRuby 9.3.2.0

jruby 9.3.2.0 (2.6.8) 2021-12-01 0b8223f905 OpenJDK 64-Bit Server VM 25.242-b08 on 1.8.0_242-b08 +jit [linux-x86_64]
Warming up --------------------------------------
Time.now.strftime("%Y-%m-%dT%H:%M:%S.%6N")
                       141.610k i/100ms
Time.now.strftime("%Y-%m-%d")
                       233.302k i/100ms
Time.now.strftime("%Y-%m-%d %H:%M:%S")
                       140.383k i/100ms
Time.now.strftime("%a, %d %b %Y %H:%M:%S.%9N")
                        94.912k i/100ms
          Logger#add    27.087k i/100ms
         Logger#info    25.980k i/100ms
Calculating -------------------------------------
Time.now.strftime("%Y-%m-%dT%H:%M:%S.%6N")
                          1.461M (± 2.2%) i/s -     43.899M in  30.065549s
Time.now.strftime("%Y-%m-%d")
                          4.023M (± 4.3%) i/s -    120.384M in  30.046343s
Time.now.strftime("%Y-%m-%d %H:%M:%S")
                          1.966M (± 2.4%) i/s -     58.961M in  30.011980s
Time.now.strftime("%a, %d %b %Y %H:%M:%S.%9N")
                          1.141M (± 2.1%) i/s -     34.263M in  30.046221s
          Logger#add    304.209k (± 2.5%) i/s -      9.128M in  30.028443s
         Logger#info    290.198k (± 2.0%) i/s -      8.703M in  30.004074s

C Ruby 2.6

ruby 2.6.7p197 (2021-04-05 revision 67941) [x86_64-linux]
Warming up --------------------------------------
Time.now.strftime("%Y-%m-%dT%H:%M:%S.%6N")
                        96.305k i/100ms
Time.now.strftime("%Y-%m-%d")
                       146.544k i/100ms
Time.now.strftime("%Y-%m-%d %H:%M:%S")
                        90.765k i/100ms
Time.now.strftime("%a, %d %b %Y %H:%M:%S.%9N")
                        68.983k i/100ms
          Logger#add    15.632k i/100ms
         Logger#info    15.251k i/100ms
Calculating -------------------------------------
Time.now.strftime("%Y-%m-%dT%H:%M:%S.%6N")
                        793.944k (± 2.7%) i/s -     23.884M in  30.105671s
Time.now.strftime("%Y-%m-%d")
                          1.465M (± 1.6%) i/s -     43.963M in  30.017596s
Time.now.strftime("%Y-%m-%d %H:%M:%S")
                        896.960k (± 2.6%) i/s -     26.957M in  30.074496s
Time.now.strftime("%a, %d %b %Y %H:%M:%S.%9N")
                        688.440k (± 1.8%) i/s -     20.695M in  30.070479s
          Logger#add    156.492k (± 1.6%) i/s -      4.705M in  30.074582s
         Logger#info    151.569k (± 2.5%) i/s -      4.545M in  30.005755s

C Ruby 3.0

Note: logger optimizes away doing anything with /dev/null.

ruby 3.0.3p157 (2021-11-24 revision 3fb7d2cadc) [x86_64-linux]
Warming up --------------------------------------
Time.now.strftime("%Y-%m-%dT%H:%M:%S.%6N")
                        90.836k i/100ms
Time.now.strftime("%Y-%m-%d")
                       137.387k i/100ms
Time.now.strftime("%Y-%m-%d %H:%M:%S")
                        84.030k i/100ms
Time.now.strftime("%a, %d %b %Y %H:%M:%S.%9N")
                        66.937k i/100ms
          Logger#add     1.175M i/100ms
         Logger#info   785.475k i/100ms
Calculating -------------------------------------
Time.now.strftime("%Y-%m-%dT%H:%M:%S.%6N")
                        754.689k (± 0.9%) i/s -     22.709M in  30.093185s
Time.now.strftime("%Y-%m-%d")
                          1.367M (± 1.7%) i/s -     41.079M in  30.065341s
Time.now.strftime("%Y-%m-%d %H:%M:%S")
                        847.641k (± 1.4%) i/s -     25.461M in  30.043280s
Time.now.strftime("%a, %d %b %Y %H:%M:%S.%9N")
                        671.847k (± 1.2%) i/s -     20.215M in  30.093076s
          Logger#add     11.754M (± 1.9%) i/s -    353.639M in  30.098646s
         Logger#info      7.744M (± 3.1%) i/s -    232.501M in  30.052223s