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