discourse/script/measure.rb

127 lines
2.5 KiB
Ruby

# using this script to try figure out why Rails 2 is slower that 1.9
#
require 'objspace'
require 'benchmark'
require 'ruby-prof'
require File.expand_path(File.dirname(__FILE__) + "/../config/environment")
def profile_allocations(name)
GC.disable
initial_size = ObjectSpace.count_objects
yield
changes = ObjectSpace.count_objects
changes.each do |k,v|
changes[k] -= initial_size[k]
end
puts "#{name} changes"
changes.sort{|a,b| b[1] <=> a[1]}.each do |a,b|
next if b <= 0
# 1 extra hash for tracking
puts "#{a} #{a == :T_HASH ? b-1 : b}"
end
GC.enable
end
def profile(name, &block)
puts "Profiling all object allocation for #{name}"
GC.start
GC.disable
items = []
objs = []
ObjectSpace.trace_object_allocations do
block.call
ObjectSpace.each_object do |o|
objs << o
end
objs.each do |o|
g = ObjectSpace.allocation_generation(o)
if g
l = ObjectSpace.allocation_sourceline(o)
f = ObjectSpace.allocation_sourcefile(o)
c = ObjectSpace.allocation_class_path(o)
m = ObjectSpace.allocation_method_id(o)
items << "Allocated #{c} in #{m} #{f}:#{l}"
end
end
end
items.group_by{|x| x}.sort{|a,b| b[1].length <=> a[1].length}.each do |row, group|
puts "#{row} x #{group.length}"
end
GC.enable
profile_allocations(name, &block)
end
# User.limit(10).to_a
# RubyProf.start
# User.limit(10).to_a
# result = RubyProf.stop
# # printer = RubyProf::GraphPrinter.new(result)
# printer = RubyProf::FlatPrinter.new(result)
# printer.print(STDOUT, :min_percent => 2)
#
# exit
#
# # User.limit(10).to_a
# User.limit(10).select(:created_at).to_a
#
# profile("limit 10") do
# User.limit(10).select(:created_at).to_a
# end
#
# exit
# User.limit(10).to_a
# exit
#
User.select('id, 2 bob').first
Benchmark.bmbm do |x|
x.report("find") do
100.times{User.find(1)}
end
x.report("grab 10 users created_at") do
100.times{User.limit(10).select(:created_at).to_a}
end
x.report("grab 10 users id") do
100.times{User.limit(10).select(:id).to_a}
end
x.report("grab 10 users") do
100.times{User.limit(10).to_a}
end
x.report("pg direct grab 10 users") do
100.times do
r = ActiveRecord::Base.connection.raw_connection.async_exec("select * from users limit 10")
r.fields.each_with_index do |f,i|
r.ftype(i)
end
r.each_row do |x|
x
end
end
end
end
# profile("find") do
# User.find(1)
# end
# puts
# profile("where") do
# User.where(id: 1).first
# end