Add AllocationTracer for create action.

Author: tgxworld

test/integration/documents_allocations_create_test.rb

@@ -0,0 +1,29 @@
+require 'test_helper'
+require 'objspace'
+
+class DocumentsIntegrationTest < ActionDispatch::IntegrationTest
+  test "create" do
+    post '/documents', params: { document: { title: "New things", content: "Doing them" } }
+
+    document = Document.last
+    assert_equal 'New things', document.title
+    assert_equal 'Doing them', document.content
+  end
+end
+
+ObjectSpace.trace_object_allocations do
+  3000.times do
+    Minitest.run_one_method(DocumentsIntegrationTest, 'test_create')
+  end
+end
+
+__END__
+ObjectSpace::AllocationTracer.setup(%i{path line type})
+result = ObjectSpace::AllocationTracer.trace do
+  3000.times do
+    Minitest.run_one_method(DocumentsIntegrationTest, 'test_create')
+  end
+end
+result.sort_by { |info, counts| counts.first }.reverse.first(5).each do |r|
+  p r
+end