mruby-redis vs mruby-vedis vs mruby-memcached vs Hash refs: http://blog.matsumoto-r.jp/?p=4071

bench.rb

class SimpleBenchmark
  def initialize width = 0
    @width = width
  end
  def measure label
    start = Time.now
    yield if block_given?
    passed = Time.now - start
    puts "#{make_fixed_label(label)}passed time #{passed} sec"
  end
  def make_fixed_label label
   if @width - label.length > 0
      label + ' ' * (@width - label.length)
    else
      label
    end
  end
end

benchmark = SimpleBenchmark.new 12
r = Redis.new "127.0.0.1", 6379
v = Vedis.new
d = Vedis.new "/tmp/vedis.db"
m = Memcached.new "127.0.0.1:11211"
h = Hash.new

n = 100000

[r, v, d, m, h].each do |kvs|
  benchmark.measure("#{kvs.class}: ") do
    n.times do |t|
      kvs[t.to_s] = t.to_s
      if kvs[t.to_s] != t.to_s
        raise "#{kvs.class}: set/get #{t.to_s} failed"
      end
    end
  end
end

r.close
v.close
d.close
m.close

build_config.rb

MRuby::Build.new do |conf|
  # load specific toolchain settings

  # Gets set by the VS command prompts.
  if ENV['VisualStudioVersion']
    toolchain :visualcpp
  else
    toolchain :gcc
  end

  enable_debug

  conf.gem :github  => 'matsumoto-r/mruby-redis'
  conf.gem :github  => 'matsumoto-r/mruby-vedis'
  conf.gem :github  => 'matsumoto-r/mruby-memcached'
  conf.gembox 'default'
end

result_at_2014_0314_29964cfdac05d558ae699e890d7224d5d04eadb5

$ ./bin/mruby bench.rb 
Redis:      passed time 5.37813999999999 sec
Vedis:      passed time 0.16775399999999 sec
Vedis:      passed time 0.30398399999999 sec
Memcached:  passed time 3.43488299999999 sec
Hash:       passed time 2.25670599999999 sec

result_at_2014_0403_6b6f893773562276438f2071073cf99bb27ccd7d

$ ./bin/mruby bench.rb 
Redis:      passed time 5.1858560 sec
Vedis:      passed time 0.15705299999999 sec
Vedis:      passed time 0.58392599999999 sec
Memcached:  passed time 3.35226299999999 sec
Hash:       passed time 0.52785199999999 sec