Created
October 8, 2010 14:55
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$:.unshift("/Users/miloops/Workspace/github/miloops/rails/activerecord/lib") | |
$:.unshift("/Users/miloops/Workspace/github/swistak/weakling/lib") | |
$:.unshift("/Users/miloops/Workspace/github/railsarel/lib") | |
require 'active_record' | |
ActiveRecord::Base.establish_connection( | |
:adapter => "sqlite3", | |
:database => ":memory:" | |
) | |
ActiveRecord::Schema.define do | |
create_table :accounts do |t| | |
t.string :email | |
t.timestamps | |
end | |
create_table :posts do |t| | |
t.string :title | |
t.text :body | |
t.integer :account_id | |
t.timestamps | |
end | |
create_table :comments do |t| | |
t.string :body | |
t.integer :post_id | |
t.timestamps | |
end | |
end | |
class Post < ActiveRecord::Base | |
belongs_to :account | |
has_many :comments | |
end | |
class Account < ActiveRecord::Base | |
has_many :posts | |
end | |
class Comment < ActiveRecord::Base | |
belongs_to :post | |
end | |
def instances(&block) | |
GC.enable_stats | |
GC.clear_stats | |
block.call | |
warmup_objs = GC.num_allocations | |
warmup_bytes = GC.allocated_size | |
GC.clear_stats | |
block.call | |
puts "=" * 50 | |
puts "ActiveRecord::IdentityMap.enabled: #{ActiveRecord::IdentityMap.enabled}" | |
puts "Objects:" | |
puts "Warmup: #{warmup_objs} allocations | #{warmup_bytes} bytes" | |
puts "Actual: #{GC.num_allocations} allocations | #{GC.allocated_size} bytes" | |
end | |
Account.destroy_all | |
a = Account.create(:email => 'miloops@example.com') | |
50.times do |i| | |
c = a.posts.create!(:title => "test", :body => "Loldel") | |
10.times do | |
c.comments.create!(:body => ("lol! " * 10)) | |
end | |
end | |
instances do | |
ActiveRecord::IdentityMap.enabled = false | |
Account.first.posts.each do |post| | |
post.account.email | |
post.comments.each do |comment| | |
comment.post.account.email | |
end | |
end | |
end | |
instances do | |
ActiveRecord::IdentityMap.enabled = true | |
Account.first.posts.each do |post| | |
post.account.email | |
post.comments.each do |comment| | |
comment.post.account.email | |
end | |
end | |
end | |
Post.belongs_to :account, :inverse_of => :posts | |
Post.has_many :comments, :inverse_of => :post | |
Comment.belongs_to :post, :inverse_of => :comments | |
Account.has_many :posts, :inverse_of => :account | |
instances do | |
ActiveRecord::IdentityMap.enabled = false | |
Account.first.posts.each do |post| | |
post.account.email | |
post.comments.each do |comment| | |
comment.post.account.email | |
end | |
end | |
end |
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-- create_table(:accounts) | |
-> 0.0247s | |
-- create_table(:posts) | |
-> 0.0008s | |
-- create_table(:comments) | |
-> 0.0006s | |
================================================== | |
ActiveRecord::IdentityMap.enabled: false | |
Objects: | |
Warmup: 555446 allocations | 20109069 bytes | |
Actual: 554746 allocations | 20045261 bytes | |
================================================== | |
ActiveRecord::IdentityMap.enabled: true | |
Objects: | |
Warmup: 118945 allocations | 3723192 bytes | |
Actual: 17924 allocations | 238183 bytes | |
================================================== | |
ActiveRecord::IdentityMap.enabled: false | |
Objects: | |
Warmup: 109178 allocations | 3464231 bytes | |
Actual: 97896 allocations | 3039749 bytes |
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