Adding a performance test for blog display

This way we won't introduce performance bottlenecks there anymore. (ActionItem1617)

Adding a performance test for blog display
This way we won't introduce performance bottlenecks there anymore. (ActionItem1617)
Antonio Terceiro
1 parent 301ce771
Showing 1 changed file with 64 additions and 0 deletions Show diff stats
test/integration/performance_test.rb
@@ -0,0 +1,64 @@
+require "#{File.dirname(__FILE__)}/../test_helper"
+require 'benchmark'
+
+class PerformanceTest < ActionController::IntegrationTest
+
+  all_fixtures
+
+  # Testing blog page display. It should not present a linear increase in time
+  # needed to display a blog page with the increase in number of posts.
+  #
+  # GOOD          BAD
+  #  
+  # ^             ^     /
+  # |             |    /
+  # |   _____     |   /
+  # |  /          |  /
+  # | /           | /
+  # |/            |/
+  # +--------->   +--------->
+  # 0  50  100    0  50  100
+  #
+  should 'not have a linear increase in time to display a blog page' do
+    person = create_profile('clueless')
+
+    # no posts
+    time0 = (Benchmark.measure { get '/clueless/blog' })
+
+    # first 50
+    create_posts(person)
+    time1 = (Benchmark.measure { get '/clueless/blog' })
+
+    # another 50
+    create_posts(person)
+    time2 = (Benchmark.measure { get '/clueless/blog' })
+
+    # should not scale linearly, i.e. the inclination of the first segment must
+    # be a lot higher than the one of the segment segment. To compensate for
+    # small variations due to hardware and/or execution environment, we are
+    # satisfied if the the inclination of the first segment is at least twice
+    # the inclination of the second segment.
+    a1 = (time1.total - time0.total)/50.0
+    a2 = (time2.total - time1.total)/50.0
+    assert a1 > a2*2, "#{a1} should be larger than #{a2} by at least a factor of 2"
+  end
+
+  protected
+
+  def create_profile(name)
+    person = create_user(name).person
+    Blog.create(:name => "Blog", :profile => person)
+    person
+  end
+
+  def create_posts(profile)
+    postnumber = profile.articles.count
+    blog = profile.blog
+    50.times do |i|
+      postnumber += 1
+      TinyMceArticle.create!(:profile => profile, :parent => blog, :name => "post number #{postnumber}")
+    end
+  end
+
+end
+
@@ -0,0 +1,64 @@		@@ -0,0 +1,64 @@
	1	+require "#{File.dirname(__FILE__)}/../test_helper"
	2	+require 'benchmark'
	3	+
	4	+class PerformanceTest < ActionController::IntegrationTest
	5	+
	6	+ all_fixtures
	7	+
	8	+ # Testing blog page display. It should not present a linear increase in time
	9	+ # needed to display a blog page with the increase in number of posts.
	10	+ #
	11	+ # GOOD BAD
	12	+ #
	13	+ # ^ ^ /
	14	+ # \| \| /
	15	+ # \| _____ \| /
	16	+ # \| / \| /
	17	+ # \| / \| /
	18	+ # \|/ \|/
	19	+ # +---------> +--------->
	20	+ # 0 50 100 0 50 100
	21	+ #
	22	+ should 'not have a linear increase in time to display a blog page' do
	23	+ person = create_profile('clueless')
	24	+
	25	+ # no posts
	26	+ time0 = (Benchmark.measure { get '/clueless/blog' })
	27	+
	28	+ # first 50
	29	+ create_posts(person)
	30	+ time1 = (Benchmark.measure { get '/clueless/blog' })
	31	+
	32	+ # another 50
	33	+ create_posts(person)
	34	+ time2 = (Benchmark.measure { get '/clueless/blog' })
	35	+
	36	+ # should not scale linearly, i.e. the inclination of the first segment must
	37	+ # be a lot higher than the one of the segment segment. To compensate for
	38	+ # small variations due to hardware and/or execution environment, we are
	39	+ # satisfied if the the inclination of the first segment is at least twice
	40	+ # the inclination of the second segment.
	41	+ a1 = (time1.total - time0.total)/50.0
	42	+ a2 = (time2.total - time1.total)/50.0
	43	+ assert a1 > a2*2, "#{a1} should be larger than #{a2} by at least a factor of 2"
	44	+ end
	45	+
	46	+ protected
	47	+
	48	+ def create_profile(name)
	49	+ person = create_user(name).person
	50	+ Blog.create(:name => "Blog", :profile => person)
	51	+ person
	52	+ end
	53	+
	54	+ def create_posts(profile)
	55	+ postnumber = profile.articles.count
	56	+ blog = profile.blog
	57	+ 50.times do \|i\|
	58	+ postnumber += 1
	59	+ TinyMceArticle.create!(:profile => profile, :parent => blog, :name => "post number #{postnumber}")
	60	+ end
	61	+ end
	62	+
	63	+end
	64	+