Benchmark for minor_schema_migration_refactor pull request: https://github.com/rails/rails/pull/10766

schema_performance.rb

require File.expand_path('../../../load_paths', __FILE__)
require "active_record"
require 'benchmark/ips'

TIME    = (ENV['BENCHMARK_TIME'] || 20).to_i
RECORDS = (ENV['BENCHMARK_RECORDS'] || TIME*1000).to_i

conn = { :adapter => 'sqlite3', :database => ':memory:' }

ActiveRecord::Base.establish_connection(conn)

Benchmark.ips(TIME) do |x|
  x.report("SchemaMigration#create_and_drop_table") do
    ActiveRecord::SchemaMigration.create_table
    ActiveRecord::SchemaMigration.drop_table
  end
end