test.rb

require "pg"
require "benchmark"
require "active_record"

ActiveRecord::Base.establish_connection(
  adapter: "postgresql",
  database: "crystal_orm_test",
  username: "postgres",
  host: "localhost"
)

class User < ActiveRecord::Base
end

  def simple_insert(idx)
    u = User.new
    u.name = "RubyGuy #{idx}"
    u.orm = "activerecord"
    u.idx = idx
    u.save
  end

  def simple_select(idx)
    User.where(orm: "activerecord").order(id: :asc).map(&:name)
  end

  def simple_update(idx_value)
    u = User.where(orm: "activerecord", idx: idx_value).first
    u.name = "Ruby Guy#{idx_value}"
    u.save
  end

Benchmark.bm do |x|
  x.report("activerecord simple_insert") do
    1000.times do |i|
      simple_insert(i)
    end
  end
end
Benchmark.bm do |x|
  x.report("activerecord simple_select") do
    1000.times do |i|
      simple_select(i)
    end
  end
end
Benchmark.bm do |x|
  x.report("activerecord simple_update") do
    1000.times do |i|
      simple_update(i)
    end
  end
end