discourse/script/micro_bench.rb

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# frozen_string_literal: true
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require 'benchmark/ips'
require File.expand_path("../../config/environment", __FILE__)
conn = ActiveRecord::Base.connection.raw_connection
Benchmark.ips do |b|
b.report("simple") do
User.first.name
end
b.report("simple with select") do
User.select("name").first.name
end
b.report("pluck with first") do
User.pluck(:name).first
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end
b.report("pluck with limit") do
User.limit(1).pluck(:name).first
end
b.report("pluck with pluck_first") do
User.pluck_first(:name)
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end
b.report("raw") do
conn.exec("SELECT name FROM users LIMIT 1").getvalue(0, 0)
end
end