画像100%リサイズを mini_magick と convert で比較

bench.rb

require 'benchmark'
require 'mini_magick'
require 'open3'

n = 100

Benchmark.bm(22) do |x|
  x.report("mini_magic") do
    n.times do
      blob = File.open('sample.jpg')
      image = MiniMagick::Image.read(blob)
      image.resize "100%"
    end
  end

  x.report("convert") do
    n.times do
      Open3.popen3('convert -resize 100% sample.jpg -') do |stdin, stdout, stderr, wait_thr|
        stdin.close
        output = stdout.read
      end
    end
  end
end

result

$ ruby bench-image-resize.rb
                             user     system      total        real
mini_magic               0.090000   0.190000   2.300000 (  3.258090)
convert                  0.040000   0.090000   1.560000 (  1.922639)