gistfile1.txt

#!/usr/bin/env ruby
# encoding: utf-8
# frozen_string_literal: true

require 'benchmark'
require 'pg'

conn = PG.connect host: '127.0.0.1', dbname: 'dbname', user: 'root', password: 'root'
# conn = PG.connect host: '127.0.0.1', dbname: 'dbname', user: 'postgres', password: 'postgres', port: 12548 # container

values = []
query = 'SELECT * FROM users LIMIT 1000'

measure = Benchmark.measure do
  conn.exec(query).each do |row|
    values << row
  end
end

puts "'#{query}' => #{measure}", values.map(&:to_json).join(' ')[0..800]