Add a CI job to profile memory usage of commit

.travis.yml

@@ -6,18 +6,21 @@ rvm:
   - 2.3
   - 2.4
   - 2.5
+  - &latest_ruby 2.6
   - ruby-head
   - jruby-head
 #  - rbx-2
 
-sudo: false
-
 addons:
   apt:
     packages:
     - libgmp3-dev
 
 matrix:
+  include:
+    - rvm: *latest_ruby
+      script: bundle exec rake memory_profile:run
+      name: Profiling Memory Usage
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head

Gemfile

@@ -8,6 +8,7 @@ gemspec
 group :benchmark, :test do
   gem 'benchmark-ips'
   gem 'memory_profiler'
+  gem 'terminal-table'
 
   install_if -> { RUBY_PLATFORM !~ /mingw|mswin|java/ } do
     gem 'stackprof'

performance/memory_profile.rb

@@ -2,25 +2,61 @@
 
 require 'benchmark/ips'
 require 'memory_profiler'
+require 'terminal-table'
 require_relative 'theme_runner'
 
-def profile(phase, &block)
-  puts
-  puts "#{phase}:"
-  puts
+class Profiler
+  LOG_LABEL   = "Profiling: ".rjust(14).freeze
+  REPORTS_DIR = File.expand_path('.memprof', __dir__).freeze
 
-  report = MemoryProfiler.report(&block)
+  def self.run
+    puts
+    yield new
+  end
 
-  report.pretty_print(
-    color_output: true,
-    scale_bytes: true,
-    detailed_report: true
-  )
+  def initialize
+    @allocated = []
+    @retained  = []
+    @headings  = []
+  end
+
+  def profile(phase, &block)
+    print LOG_LABEL
+    print "#{phase}.. ".ljust(10)
+    report = MemoryProfiler.report(&block)
+    puts 'Done.'
+    @headings  << phase.capitalize
+    @allocated << "#{report.scale_bytes(report.total_allocated_memsize)} (#{report.total_allocated} objects)"
+    @retained  << "#{report.scale_bytes(report.total_retained_memsize)} (#{report.total_retained} objects)"
+
+    return if ENV['CI']
+    require 'fileutils'
+    report_file = File.join(REPORTS_DIR, "#{sanitize(phase)}.txt")
+    FileUtils.mkdir_p(REPORTS_DIR)
+    report.pretty_print(to_file: report_file, scale_bytes: true)
+  end
+
+  def tabulate
+    table = Terminal::Table.new(headings: @headings.unshift('Phase')) do |t|
+      t << @allocated.unshift('Total allocated')
+      t << @retained.unshift('Total retained')
+    end
+
+    puts
+    puts table
+    puts "\nDetailed report(s) saved to #{REPORTS_DIR}/" unless ENV['CI']
+  end
+
+  def sanitize(string)
+    string.downcase.gsub(/[\W]/, '-').squeeze('-')
+  end
 end
 
 Liquid::Template.error_mode = ARGV.first.to_sym if ARGV.first
 
-profiler = ThemeRunner.new
-
-profile("Parsing") { profiler.compile }
-profile("Rendering") { profiler.render }
+runner = ThemeRunner.new
+Profiler.run do |x|
+  x.profile('parse') { runner.compile }
+  x.profile('render') { runner.render }
+  x.tabulate
+end