gistfile1.txt

# Trying to replicate performance issues with DM 1.0
# DM 0.10.2 -> 1.230000   0.110000   1.340000 (  2.535200)
# DM 1.0.2  -> 3.080000   0.190000   3.270000 (  4.842546)
#
require 'rubygems'
require 'dm-core'
require 'dm-migrations'
require 'dm-migrations/migration_runner'
require 'dm-timestamps'
require 'benchmark'

#DataMapper::Logger.new($stdout, :debug)
DataMapper.setup(:default, 'postgres://localhost/dm_perf_test') # createdb test

class Course
  include DataMapper::Resource

  property :id, Serial
  property :name, String

  has n, :exams
end

class Exam
  include DataMapper::Resource
  property :id, Serial
  property :course_id, Serial

  belongs_to :course
end



DataMapper::MigrationRunner.migration( 1, :create_courses ) do
  up do
    create_table :courses do
      column :id,   Integer, :serial => true
      column :name, String, :size => 50
    end

    create_index(:courses, :id)

    create_table :exams do
      column :id,   Integer, :serial => true
      column :course_id,   Integer
    end
    create_index(:exams, :id)
    create_index(:exams, :course_id)
  end
  down do
    drop_table :exams
    drop_table :courses
  end
end

DataMapper::MigrationRunner.migrate_up!

timing = Benchmark.measure do 
  1000.times do |i|
    course = Course.create(:name =>"Ruby #{i}")
    Exam.create(:course => course)
  end
end

puts timing