Require profiling libraries only when they are strictly necessary

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## 1.0.3 [compare][compare_v1_0_2_and_master]
 
+- Require profiling libraries only when they are strictly necessary by [@gonzedge][github_user_gonzedge]
 - Add `#compress` method to public API by [@gonzedge][github_user_gonzedge]
 - Refactor trie integration tests by [@gonzedge][github_user_gonzedge]
 - Refactor serializer tests by [@gonzedge][github_user_gonzedge]

tasks/performance.rb

@@ -1,9 +1,4 @@
 require 'fileutils'
-require 'benchmark'
-require 'ruby-prof'
-require 'memory_profiler'
-require 'benchmark/ips'
-require 'flamegraph'
 
 %w{
   configuration directory report task
@@ -12,6 +7,8 @@
 end
 
 task :performance, [:type, :method] => 'performance:directory' do |t, args|
+  require 'benchmark/ips'
+
   configuration = Performance::Configuration.new
   task = Performance::Task.new configuration
   task.run args

tasks/performance/reporters/benchmark.rb

@@ -25,6 +25,7 @@ def do_report iterations, params
       def measure iterations, param
         result = nil
 
+        require 'benchmark'
         measure = ::Benchmark.measure do
           iterations.times do
             result = yield param

tasks/performance/reporters/call_tree_profile.rb

@@ -10,6 +10,7 @@ def initialize dirname
       def do_report iterations, params
         FileUtils.mkdir_p dirpath
 
+        require 'ruby-prof'
         result = RubyProf.profile merge_fibers: true do
           params.each do |param|
             iterations.times do

tasks/performance/reporters/flamegraph.rb

@@ -10,6 +10,7 @@ def initialize filename
       def do_report iterations, params
         FileUtils.mkdir_p dirpath
 
+        require 'flamegraph'
         result = ::Flamegraph.generate filepath do
           params.each do |param|
             iterations.times do

tasks/performance/reporters/memory_profile.rb

@@ -10,6 +10,7 @@ def initialize filename
       def do_report iterations, params
         FileUtils.mkdir_p dirpath
 
+        require 'memory_profiler'
         result = MemoryProfiler.report allow_files: 'lib/rambling/trie', ignore_files: 'lib/rambling/trie/tasks' do
           with_gc_stats "performing #{filename}" do
             params.each do |param|