struct_bench.rb

require 'benchmark/ips'
require 'ostruct'

N = 100
ATTRS = (:aa..:zz).take(N)
HASH = Hash[ATTRS.map { |x| [x, x] }]

CStruct = Struct.new(*ATTRS)

def struct
  CStruct.new(*ATTRS)
end

def ostruct
  OpenStruct.new(HASH)
end

Benchmark.ips do |x|
  x.report('struct')  { struct }
  x.report('ostruct') { ostruct }
  x.compare!
end