From 6b6ca767352711d4ce1b8c8b743c33d324b0c142 Mon Sep 17 00:00:00 2001
From: Nikita <Nikita>
Date: Sun, 16 Mar 2025 01:30:34 +0300
Subject: [PATCH 1/4] [zero] create core classes and initial measure

---
 .rspec                   |   1 +
 Gemfile                  |  10 +
 Gemfile.lock             |  35 +++
 main.rb                  | 147 ++++++++++++
 measurer.rb              |  10 +
 profiler.rb              |  49 ++++
 profiles/memory_profiler | 506 +++++++++++++++++++++++++++++++++++++++
 profiles/stackprof.dump  | Bin 0 -> 5039 bytes
 spec/main_spec.rb        |  33 +++
 spec/spec_helper.rb      | 105 ++++++++
 task-2.rb                | 179 +-------------
 user.rb                  |   8 +
 12 files changed, 910 insertions(+), 173 deletions(-)
 create mode 100644 .rspec
 create mode 100644 Gemfile
 create mode 100644 Gemfile.lock
 create mode 100644 main.rb
 create mode 100644 measurer.rb
 create mode 100644 profiler.rb
 create mode 100644 profiles/memory_profiler
 create mode 100644 profiles/stackprof.dump
 create mode 100644 spec/main_spec.rb
 create mode 100644 spec/spec_helper.rb
 create mode 100644 user.rb

diff --git a/.rspec b/.rspec
new file mode 100644
index 00000000..c99d2e73
--- /dev/null
+++ b/.rspec
@@ -0,0 +1 @@
+--require spec_helper
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 00000000..ba961d0a
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+ 
+
+gem 'stackprof'
+gem 'ruby-prof'
+gem 'memory_profiler'
+gem 'rspec'
+gem 'byebug'
diff --git a/Gemfile.lock b/Gemfile.lock
new file mode 100644
index 00000000..293b5584
--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,35 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    byebug (11.1.3)
+    diff-lcs (1.6.0)
+    memory_profiler (1.1.0)
+    rspec (3.13.0)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.3)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.3)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.2)
+    ruby-prof (1.7.1)
+    stackprof (0.2.27)
+
+PLATFORMS
+  ruby
+  x86_64-linux
+
+DEPENDENCIES
+  byebug
+  memory_profiler
+  rspec
+  ruby-prof
+  stackprof
+
+BUNDLED WITH
+   2.5.18
diff --git a/main.rb b/main.rb
new file mode 100644
index 00000000..f9bd3354
--- /dev/null
+++ b/main.rb
@@ -0,0 +1,147 @@
+class Main
+  PARTIAL_VOLUME_FILE_NAME = "dataN.txt"
+
+  def initialize(options: {})
+    @source_file_name = options[:source_file_name] || 'data_large.txt'
+    @count_lines = options[:count_lines]
+    @is_print_memory_usage = options[:is_print_memory_usage] || false
+  end
+
+  def call = work
+
+  private
+
+  attr_reader :source_file_name, :count_lines, :is_print_memory_usage
+
+  def work
+    `head -n #{count_lines} #{source_file_name} > #{PARTIAL_VOLUME_FILE_NAME}` if count_lines
+    file_lines = File.read(count_lines ? PARTIAL_VOLUME_FILE_NAME : source_file_name).split("\n")
+
+    users = []
+    sessions = []
+  
+    file_lines.each do |line|
+      cols = line.split(',')
+      users = users + [parse_user(line)] if cols[0] == 'user'
+      sessions = sessions + [parse_session(line)] if cols[0] == 'session'
+    end
+  
+    # Отчёт в json
+    #   - Сколько всего юзеров +
+    #   - Сколько всего уникальных браузеров +
+    #   - Сколько всего сессий +
+    #   - Перечислить уникальные браузеры в алфавитном порядке через запятую и капсом +
+    #
+    #   - По каждому пользователю
+    #     - сколько всего сессий +
+    #     - сколько всего времени +
+    #     - самая длинная сессия +
+    #     - браузеры через запятую +
+    #     - Хоть раз использовал IE? +
+    #     - Всегда использовал только Хром? +
+    #     - даты сессий в порядке убывания через запятую +
+  
+    report = {}
+  
+    report[:totalUsers] = users.count
+  
+    # Подсчёт количества уникальных браузеров
+    uniqueBrowsers = []
+    sessions.each do |session|
+      browser = session['browser']
+      uniqueBrowsers += [browser] if uniqueBrowsers.all? { |b| b != browser }
+    end
+  
+    report['uniqueBrowsersCount'] = uniqueBrowsers.count
+  
+    report['totalSessions'] = sessions.count
+  
+    report['allBrowsers'] =
+      sessions
+        .map { |s| s['browser'] }
+        .map { |b| b.upcase }
+        .sort
+        .uniq
+        .join(',')
+  
+    # Статистика по пользователям
+    users_objects = []
+  
+    users.each do |user|
+      attributes = user
+      user_sessions = sessions.select { |session| session['user_id'] == user['id'] }
+      user_object = User.new(attributes: attributes, sessions: user_sessions)
+      users_objects = users_objects + [user_object]
+    end
+  
+    report['usersStats'] = {}
+  
+    # Собираем количество сессий по пользователям
+    collect_stats_from_users(report, users_objects) do |user|
+      { 'sessionsCount' => user.sessions.count }
+    end
+  
+    # Собираем количество времени по пользователям
+    collect_stats_from_users(report, users_objects) do |user|
+      { 'totalTime' => user.sessions.map {|s| s['time']}.map {|t| t.to_i}.sum.to_s + ' min.' }
+    end
+  
+    # Выбираем самую длинную сессию пользователя
+    collect_stats_from_users(report, users_objects) do |user|
+      { 'longestSession' => user.sessions.map {|s| s['time']}.map {|t| t.to_i}.max.to_s + ' min.' }
+    end
+  
+    # Браузеры пользователя через запятую
+    collect_stats_from_users(report, users_objects) do |user|
+      { 'browsers' => user.sessions.map {|s| s['browser']}.map {|b| b.upcase}.sort.join(', ') }
+    end
+  
+    # Хоть раз использовал IE?
+    collect_stats_from_users(report, users_objects) do |user|
+      { 'usedIE' => user.sessions.map{|s| s['browser']}.any? { |b| b.upcase =~ /INTERNET EXPLORER/ } }
+    end
+  
+    # Всегда использовал только Chrome?
+    collect_stats_from_users(report, users_objects) do |user|
+      { 'alwaysUsedChrome' => user.sessions.map{|s| s['browser']}.all? { |b| b.upcase =~ /CHROME/ } }
+    end
+  
+    # Даты сессий через запятую в обратном порядке в формате iso8601
+    collect_stats_from_users(report, users_objects) do |user|
+      { 'dates' => user.sessions.map{|s| s['date']}.map {|d| Date.parse(d)}.sort.reverse.map { |d| d.iso8601 } }
+    end
+  
+    File.write('result.json', "#{report.to_json}\n")
+
+    puts "MEMORY USAGE: #{(`ps -o rss= -p #{Process.pid}`.to_i / 1024)} MB" if is_print_memory_usage
+  end
+
+  def parse_user(user)
+    fields = user.split(',')
+    parsed_result = {
+      'id' => fields[1],
+      'first_name' => fields[2],
+      'last_name' => fields[3],
+      'age' => fields[4],
+    }
+  end
+  
+  def parse_session(session)
+    fields = session.split(',')
+    parsed_result = {
+      'user_id' => fields[1],
+      'session_id' => fields[2],
+      'browser' => fields[3],
+      'time' => fields[4],
+      'date' => fields[5],
+    }
+  end
+  
+  def collect_stats_from_users(report, users_objects, &block)
+    users_objects.each do |user|
+      user_key = "#{user.attributes['first_name']}" + ' ' + "#{user.attributes['last_name']}"
+      report['usersStats'][user_key] ||= {}
+      report['usersStats'][user_key] = report['usersStats'][user_key].merge(block.call(user))
+    end
+  end
+end
diff --git a/measurer.rb b/measurer.rb
new file mode 100644
index 00000000..8de867b0
--- /dev/null
+++ b/measurer.rb
@@ -0,0 +1,10 @@
+require_relative 'main'
+
+class Measurer
+  def call
+    Main.new(options: { count_lines: 15_000, is_print_memory_usage: true }).call
+  end
+end
+
+# Zero iteration:
+# 15_000 lines: 103 MB
diff --git a/profiler.rb b/profiler.rb
new file mode 100644
index 00000000..0099c34c
--- /dev/null
+++ b/profiler.rb
@@ -0,0 +1,49 @@
+require 'memory_profiler'
+require 'stackprof'
+require 'ruby-prof'
+
+require_relative 'main'
+
+class Profiler
+  def initialize(count_lines:)
+    @count_lines = count_lines
+  end
+
+  def call
+    profile_by_memory_profiler
+    profile_memory_by_ruby_prof
+    profile_allocations_by_ruby_prof
+    profile_allocations_by_stack_prof
+  end
+
+  private
+
+  attr_reader :count_lines
+
+  def profile_by_memory_profiler
+    report = MemoryProfiler.report { action }
+    report.pretty_print(to_file: './profiles/memory_profiler')
+  end
+
+  def profile_memory_by_ruby_prof
+    RubyProf.measure_mode = RubyProf::MEMORY
+    result = RubyProf.profile { action }
+    printer = RubyProf::CallTreePrinter.new(result)
+    printer.print(:path => ".", :profile => "profiles/ruby_prof_memory_profile")
+  end
+
+  def profile_allocations_by_ruby_prof
+    RubyProf.measure_mode = RubyProf::ALLOCATIONS
+    result = RubyProf.profile { action }
+    printer = RubyProf::CallTreePrinter.new(result)
+    printer.print(:path => ".", :profile => "profiles/ruby_prof_allocations_profile")
+  end
+
+  def profile_allocations_by_stack_prof
+    StackProf.run(mode: :object, out: 'profiles/stackprof.dump') do
+      action
+    end
+  end
+
+  def action = Main.new(options: { count_lines: }).call
+end
diff --git a/profiles/memory_profiler b/profiles/memory_profiler
new file mode 100644
index 00000000..b22436b2
--- /dev/null
+++ b/profiles/memory_profiler
@@ -0,0 +1,506 @@
+Total allocated: 3791101592 bytes (1471886 objects)
+Total retained:  4249 bytes (9 objects)
+
+allocated memory by gem
+-----------------------------------
+3791101592  other
+
+allocated memory by file
+-----------------------------------
+3791101032  /home/nikita/rails_optimization/task_2/main.rb
+       560  /home/nikita/rails_optimization/task_2/profiler.rb
+
+allocated memory by location
+-----------------------------------
+2585606480  /home/nikita/rails_optimization/task_2/main.rb:26
+ 933571968  /home/nikita/rails_optimization/task_2/main.rb:72
+  85937936  /home/nikita/rails_optimization/task_2/main.rb:25
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+   2063760  /home/nikita/rails_optimization/task_2/main.rb:86
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+    183152  /home/nikita/rails_optimization/task_2/main.rb:52
+      2645  /home/nikita/rails_optimization/task_2/main.rb:65
+      1640  /home/nikita/rails_optimization/task_2/main.rb:64
+       728  /home/nikita/rails_optimization/task_2/main.rb:17
+       560  /home/nikita/rails_optimization/task_2/profiler.rb:48
+       160  /home/nikita/rails_optimization/task_2/main.rb:44
+        40  /home/nikita/rails_optimization/task_2/main.rb:20
+        40  /home/nikita/rails_optimization/task_2/main.rb:21
+        40  /home/nikita/rails_optimization/task_2/main.rb:49
+        40  /home/nikita/rails_optimization/task_2/main.rb:5
+        40  /home/nikita/rails_optimization/task_2/main.rb:68
+
+allocated memory by class
+-----------------------------------
+3706736736  Array
+  47273903  String
+  21586016  Hash
+  13478424  MatchData
+   1829376  Date
+    183680  User
+      8688  File
+      3609  Regexp
+       560  Proc
+       248  IO
+       120  JSON::Ext::Generator::State
+        80  Main
+        80  Process::Status
+        72  Thread::Mutex
+
+allocated objects by gem
+-----------------------------------
+   1471886  other
+
+allocated objects by file
+-----------------------------------
+   1471882  /home/nikita/rails_optimization/task_2/main.rb
+         4  /home/nikita/rails_optimization/task_2/profiler.rb
+
+allocated objects by location
+-----------------------------------
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+         1  /home/nikita/rails_optimization/task_2/main.rb:77
+
+allocated objects by class
+-----------------------------------
+   1006313  String
+    206678  Array
+    133479  Hash
+     95399  MatchData
+     25408  Date
+      4592  User
+         7  Proc
+         3  Regexp
+         2  File
+         1  IO
+         1  JSON::Ext::Generator::State
+         1  Main
+         1  Process::Status
+         1  Thread::Mutex
+
+retained memory by gem
+-----------------------------------
+      4249  other
+
+retained memory by file
+-----------------------------------
+      4249  /home/nikita/rails_optimization/task_2/main.rb
+
+retained memory by location
+-----------------------------------
+      4169  /home/nikita/rails_optimization/task_2/main.rb:111
+        80  /home/nikita/rails_optimization/task_2/main.rb:17
+
+retained memory by class
+-----------------------------------
+      3609  Regexp
+       560  String
+        80  Process::Status
+
+retained objects by gem
+-----------------------------------
+         9  other
+
+retained objects by file
+-----------------------------------
+         9  /home/nikita/rails_optimization/task_2/main.rb
+
+retained objects by location
+-----------------------------------
+         8  /home/nikita/rails_optimization/task_2/main.rb:111
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+
+retained objects by class
+-----------------------------------
+         5  String
+         3  Regexp
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+
+
+Allocated String Report
+-----------------------------------
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+
+Retained String Report
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diff --git a/spec/main_spec.rb b/spec/main_spec.rb
new file mode 100644
index 00000000..46e6232d
--- /dev/null
+++ b/spec/main_spec.rb
@@ -0,0 +1,33 @@
+require_relative "spec_helper"
+
+describe Main do
+  before do
+    File.write('result.json', '')
+    File.write('data.txt',
+'user,0,Leida,Cira,0
+session,0,0,Safari 29,87,2016-10-23
+session,0,1,Firefox 12,118,2017-02-27
+session,0,2,Internet Explorer 28,31,2017-03-28
+session,0,3,Internet Explorer 28,109,2016-09-15
+session,0,4,Safari 39,104,2017-09-27
+session,0,5,Internet Explorer 35,6,2016-09-01
+user,1,Palmer,Katrina,65
+session,1,0,Safari 17,12,2016-10-21
+session,1,1,Firefox 32,3,2016-12-20
+session,1,2,Chrome 6,59,2016-11-11
+session,1,3,Internet Explorer 10,28,2017-04-29
+session,1,4,Chrome 13,116,2016-12-28
+user,2,Gregory,Santos,86
+session,2,0,Chrome 35,6,2018-09-21
+session,2,1,Safari 49,85,2017-05-22
+session,2,2,Firefox 47,17,2018-02-02
+session,2,3,Chrome 20,84,2016-11-25
+')
+  end
+
+  it "записывает в файл корректный результат" do
+    Main.new(options: { source_file_name: "data.txt" }).call
+    expected_result = '{"totalUsers":3,"uniqueBrowsersCount":14,"totalSessions":15,"allBrowsers":"CHROME 13,CHROME 20,CHROME 35,CHROME 6,FIREFOX 12,FIREFOX 32,FIREFOX 47,INTERNET EXPLORER 10,INTERNET EXPLORER 28,INTERNET EXPLORER 35,SAFARI 17,SAFARI 29,SAFARI 39,SAFARI 49","usersStats":{"Leida Cira":{"sessionsCount":6,"totalTime":"455 min.","longestSession":"118 min.","browsers":"FIREFOX 12, INTERNET EXPLORER 28, INTERNET EXPLORER 28, INTERNET EXPLORER 35, SAFARI 29, SAFARI 39","usedIE":true,"alwaysUsedChrome":false,"dates":["2017-09-27","2017-03-28","2017-02-27","2016-10-23","2016-09-15","2016-09-01"]},"Palmer Katrina":{"sessionsCount":5,"totalTime":"218 min.","longestSession":"116 min.","browsers":"CHROME 13, CHROME 6, FIREFOX 32, INTERNET EXPLORER 10, SAFARI 17","usedIE":true,"alwaysUsedChrome":false,"dates":["2017-04-29","2016-12-28","2016-12-20","2016-11-11","2016-10-21"]},"Gregory Santos":{"sessionsCount":4,"totalTime":"192 min.","longestSession":"85 min.","browsers":"CHROME 20, CHROME 35, FIREFOX 47, SAFARI 49","usedIE":false,"alwaysUsedChrome":false,"dates":["2018-09-21","2018-02-02","2017-05-22","2016-11-25"]}}}' + "\n"
+    expect(File.read('result.json')).to eq(expected_result)
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 00000000..8dad3d3b
--- /dev/null
+++ b/spec/spec_helper.rb
@@ -0,0 +1,105 @@
+# This file was generated by the `rspec --init` command. Conventionally, all
+# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
+# The generated `.rspec` file contains `--require spec_helper` which will cause
+# this file to always be loaded, without a need to explicitly require it in any
+# files.
+#
+# Given that it is always loaded, you are encouraged to keep this file as
+# light-weight as possible. Requiring heavyweight dependencies from this file
+# will add to the boot time of your test suite on EVERY test run, even for an
+# individual file that may not need all of that loaded. Instead, consider making
+# a separate helper file that requires the additional dependencies and performs
+# the additional setup, and require it from the spec files that actually need
+# it.
+#
+# See https://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+
+require 'json'
+require 'byebug'
+require 'date'
+require_relative "../user"
+require_relative "../main"
+
+RSpec.configure do |config|
+  # rspec-expectations config goes here. You can use an alternate
+  # assertion/expectation library such as wrong or the stdlib/minitest
+  # assertions if you prefer.
+  config.expect_with :rspec do |expectations|
+    # This option will default to `true` in RSpec 4. It makes the `description`
+    # and `failure_message` of custom matchers include text for helper methods
+    # defined using `chain`, e.g.:
+    #     be_bigger_than(2).and_smaller_than(4).description
+    #     # => "be bigger than 2 and smaller than 4"
+    # ...rather than:
+    #     # => "be bigger than 2"
+    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
+  end
+
+  # rspec-mocks config goes here. You can use an alternate test double
+  # library (such as bogus or mocha) by changing the `mock_with` option here.
+  config.mock_with :rspec do |mocks|
+    # Prevents you from mocking or stubbing a method that does not exist on
+    # a real object. This is generally recommended, and will default to
+    # `true` in RSpec 4.
+    mocks.verify_partial_doubles = true
+  end
+
+  # This option will default to `:apply_to_host_groups` in RSpec 4 (and will
+  # have no way to turn it off -- the option exists only for backwards
+  # compatibility in RSpec 3). It causes shared context metadata to be
+  # inherited by the metadata hash of host groups and examples, rather than
+  # triggering implicit auto-inclusion in groups with matching metadata.
+  config.shared_context_metadata_behavior = :apply_to_host_groups
+
+# The settings below are suggested to provide a good initial experience
+# with RSpec, but feel free to customize to your heart's content.
+=begin
+  # This allows you to limit a spec run to individual examples or groups
+  # you care about by tagging them with `:focus` metadata. When nothing
+  # is tagged with `:focus`, all examples get run. RSpec also provides
+  # aliases for `it`, `describe`, and `context` that include `:focus`
+  # metadata: `fit`, `fdescribe` and `fcontext`, respectively.
+  config.filter_run_when_matching :focus
+
+  # Allows RSpec to persist some state between runs in order to support
+  # the `--only-failures` and `--next-failure` CLI options. We recommend
+  # you configure your source control system to ignore this file.
+  config.example_status_persistence_file_path = "spec/examples.txt"
+
+  # Limits the available syntax to the non-monkey patched syntax that is
+  # recommended. For more details, see:
+  # https://rspec.info/features/3-12/rspec-core/configuration/zero-monkey-patching-mode/
+  config.disable_monkey_patching!
+
+  # This setting enables warnings. It's recommended, but in some cases may
+  # be too noisy due to issues in dependencies.
+  config.warnings = true
+
+  # Many RSpec users commonly either run the entire suite or an individual
+  # file, and it's useful to allow more verbose output when running an
+  # individual spec file.
+  if config.files_to_run.one?
+    # Use the documentation formatter for detailed output,
+    # unless a formatter has already been configured
+    # (e.g. via a command-line flag).
+    config.default_formatter = "doc"
+  end
+
+  # Print the 10 slowest examples and example groups at the
+  # end of the spec run, to help surface which specs are running
+  # particularly slow.
+  config.profile_examples = 10
+
+  # Run specs in random order to surface order dependencies. If you find an
+  # order dependency and want to debug it, you can fix the order by providing
+  # the seed, which is printed after each run.
+  #     --seed 1234
+  config.order = :random
+
+  # Seed global randomization in this process using the `--seed` CLI option.
+  # Setting this allows you to use `--seed` to deterministically reproduce
+  # test failures related to randomization by passing the same `--seed` value
+  # as the one that triggered the failure.
+  Kernel.srand config.seed
+=end
+end
diff --git a/task-2.rb b/task-2.rb
index 34e09a3c..dff0b927 100644
--- a/task-2.rb
+++ b/task-2.rb
@@ -1,177 +1,10 @@
 # Deoptimized version of homework task
 
 require 'json'
-require 'pry'
+require 'byebug'
 require 'date'
-require 'minitest/autorun'
-
-class User
-  attr_reader :attributes, :sessions
-
-  def initialize(attributes:, sessions:)
-    @attributes = attributes
-    @sessions = sessions
-  end
-end
-
-def parse_user(user)
-  fields = user.split(',')
-  parsed_result = {
-    'id' => fields[1],
-    'first_name' => fields[2],
-    'last_name' => fields[3],
-    'age' => fields[4],
-  }
-end
-
-def parse_session(session)
-  fields = session.split(',')
-  parsed_result = {
-    'user_id' => fields[1],
-    'session_id' => fields[2],
-    'browser' => fields[3],
-    'time' => fields[4],
-    'date' => fields[5],
-  }
-end
-
-def collect_stats_from_users(report, users_objects, &block)
-  users_objects.each do |user|
-    user_key = "#{user.attributes['first_name']}" + ' ' + "#{user.attributes['last_name']}"
-    report['usersStats'][user_key] ||= {}
-    report['usersStats'][user_key] = report['usersStats'][user_key].merge(block.call(user))
-  end
-end
-
-def work
-  file_lines = File.read('data.txt').split("\n")
-
-  users = []
-  sessions = []
-
-  file_lines.each do |line|
-    cols = line.split(',')
-    users = users + [parse_user(line)] if cols[0] == 'user'
-    sessions = sessions + [parse_session(line)] if cols[0] == 'session'
-  end
-
-  # Отчёт в json
-  #   - Сколько всего юзеров +
-  #   - Сколько всего уникальных браузеров +
-  #   - Сколько всего сессий +
-  #   - Перечислить уникальные браузеры в алфавитном порядке через запятую и капсом +
-  #
-  #   - По каждому пользователю
-  #     - сколько всего сессий +
-  #     - сколько всего времени +
-  #     - самая длинная сессия +
-  #     - браузеры через запятую +
-  #     - Хоть раз использовал IE? +
-  #     - Всегда использовал только Хром? +
-  #     - даты сессий в порядке убывания через запятую +
-
-  report = {}
-
-  report[:totalUsers] = users.count
-
-  # Подсчёт количества уникальных браузеров
-  uniqueBrowsers = []
-  sessions.each do |session|
-    browser = session['browser']
-    uniqueBrowsers += [browser] if uniqueBrowsers.all? { |b| b != browser }
-  end
-
-  report['uniqueBrowsersCount'] = uniqueBrowsers.count
-
-  report['totalSessions'] = sessions.count
-
-  report['allBrowsers'] =
-    sessions
-      .map { |s| s['browser'] }
-      .map { |b| b.upcase }
-      .sort
-      .uniq
-      .join(',')
-
-  # Статистика по пользователям
-  users_objects = []
-
-  users.each do |user|
-    attributes = user
-    user_sessions = sessions.select { |session| session['user_id'] == user['id'] }
-    user_object = User.new(attributes: attributes, sessions: user_sessions)
-    users_objects = users_objects + [user_object]
-  end
-
-  report['usersStats'] = {}
-
-  # Собираем количество сессий по пользователям
-  collect_stats_from_users(report, users_objects) do |user|
-    { 'sessionsCount' => user.sessions.count }
-  end
-
-  # Собираем количество времени по пользователям
-  collect_stats_from_users(report, users_objects) do |user|
-    { 'totalTime' => user.sessions.map {|s| s['time']}.map {|t| t.to_i}.sum.to_s + ' min.' }
-  end
-
-  # Выбираем самую длинную сессию пользователя
-  collect_stats_from_users(report, users_objects) do |user|
-    { 'longestSession' => user.sessions.map {|s| s['time']}.map {|t| t.to_i}.max.to_s + ' min.' }
-  end
-
-  # Браузеры пользователя через запятую
-  collect_stats_from_users(report, users_objects) do |user|
-    { 'browsers' => user.sessions.map {|s| s['browser']}.map {|b| b.upcase}.sort.join(', ') }
-  end
-
-  # Хоть раз использовал IE?
-  collect_stats_from_users(report, users_objects) do |user|
-    { 'usedIE' => user.sessions.map{|s| s['browser']}.any? { |b| b.upcase =~ /INTERNET EXPLORER/ } }
-  end
-
-  # Всегда использовал только Chrome?
-  collect_stats_from_users(report, users_objects) do |user|
-    { 'alwaysUsedChrome' => user.sessions.map{|s| s['browser']}.all? { |b| b.upcase =~ /CHROME/ } }
-  end
-
-  # Даты сессий через запятую в обратном порядке в формате iso8601
-  collect_stats_from_users(report, users_objects) do |user|
-    { 'dates' => user.sessions.map{|s| s['date']}.map {|d| Date.parse(d)}.sort.reverse.map { |d| d.iso8601 } }
-  end
-
-  File.write('result.json', "#{report.to_json}\n")
-  puts "MEMORY USAGE: %d MB" % (`ps -o rss= -p #{Process.pid}`.to_i / 1024)
-end
-
-class TestMe < Minitest::Test
-  def setup
-    File.write('result.json', '')
-    File.write('data.txt',
-'user,0,Leida,Cira,0
-session,0,0,Safari 29,87,2016-10-23
-session,0,1,Firefox 12,118,2017-02-27
-session,0,2,Internet Explorer 28,31,2017-03-28
-session,0,3,Internet Explorer 28,109,2016-09-15
-session,0,4,Safari 39,104,2017-09-27
-session,0,5,Internet Explorer 35,6,2016-09-01
-user,1,Palmer,Katrina,65
-session,1,0,Safari 17,12,2016-10-21
-session,1,1,Firefox 32,3,2016-12-20
-session,1,2,Chrome 6,59,2016-11-11
-session,1,3,Internet Explorer 10,28,2017-04-29
-session,1,4,Chrome 13,116,2016-12-28
-user,2,Gregory,Santos,86
-session,2,0,Chrome 35,6,2018-09-21
-session,2,1,Safari 49,85,2017-05-22
-session,2,2,Firefox 47,17,2018-02-02
-session,2,3,Chrome 20,84,2016-11-25
-')
-  end
-
-  def test_result
-    work
-    expected_result = JSON.parse('{"totalUsers":3,"uniqueBrowsersCount":14,"totalSessions":15,"allBrowsers":"CHROME 13,CHROME 20,CHROME 35,CHROME 6,FIREFOX 12,FIREFOX 32,FIREFOX 47,INTERNET EXPLORER 10,INTERNET EXPLORER 28,INTERNET EXPLORER 35,SAFARI 17,SAFARI 29,SAFARI 39,SAFARI 49","usersStats":{"Leida Cira":{"sessionsCount":6,"totalTime":"455 min.","longestSession":"118 min.","browsers":"FIREFOX 12, INTERNET EXPLORER 28, INTERNET EXPLORER 28, INTERNET EXPLORER 35, SAFARI 29, SAFARI 39","usedIE":true,"alwaysUsedChrome":false,"dates":["2017-09-27","2017-03-28","2017-02-27","2016-10-23","2016-09-15","2016-09-01"]},"Palmer Katrina":{"sessionsCount":5,"totalTime":"218 min.","longestSession":"116 min.","browsers":"CHROME 13, CHROME 6, FIREFOX 32, INTERNET EXPLORER 10, SAFARI 17","usedIE":true,"alwaysUsedChrome":false,"dates":["2017-04-29","2016-12-28","2016-12-20","2016-11-11","2016-10-21"]},"Gregory Santos":{"sessionsCount":4,"totalTime":"192 min.","longestSession":"85 min.","browsers":"CHROME 20, CHROME 35, FIREFOX 47, SAFARI 49","usedIE":false,"alwaysUsedChrome":false,"dates":["2018-09-21","2018-02-02","2017-05-22","2016-11-25"]}}}')
-    assert_equal expected_result, JSON.parse(File.read('result.json'))
-  end
-end
+require 'benchmark'
+require_relative 'user'
+require_relative 'measurer'
+require_relative 'profiler'
+require_relative 'main'
diff --git a/user.rb b/user.rb
new file mode 100644
index 00000000..c0a90d89
--- /dev/null
+++ b/user.rb
@@ -0,0 +1,8 @@
+class User
+  attr_reader :attributes, :sessions
+
+  def initialize(attributes:, sessions:)
+    @attributes = attributes
+    @sessions = sessions
+  end
+end

From 420ecf8cc4ceeb3cf50e4312f113ec443129cf6a Mon Sep 17 00:00:00 2001
From: Nikita <Nikita>
Date: Sun, 16 Mar 2025 11:24:53 +0300
Subject: [PATCH 2/4] [Zero Iteration] add control measuring thread in measurer

---
 main.rb     |  2 --
 measurer.rb | 24 ++++++++++++++++++++++--
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/main.rb b/main.rb
index f9bd3354..c74e162e 100644
--- a/main.rb
+++ b/main.rb
@@ -112,8 +112,6 @@ def work
     end
   
     File.write('result.json', "#{report.to_json}\n")
-
-    puts "MEMORY USAGE: #{(`ps -o rss= -p #{Process.pid}`.to_i / 1024)} MB" if is_print_memory_usage
   end
 
   def parse_user(user)
diff --git a/measurer.rb b/measurer.rb
index 8de867b0..beae5245 100644
--- a/measurer.rb
+++ b/measurer.rb
@@ -1,8 +1,28 @@
 require_relative 'main'
 
 class Measurer
-  def call
-    Main.new(options: { count_lines: 15_000, is_print_memory_usage: true }).call
+  MEMORY_USAGE_LIMIT_MB = 70
+  CHECK_USAGE_INTERVAL_SEC = 1
+
+  def initialize(count_lines)
+    @count_lines = count_lines
+  end
+
+  def call = [memory_measurer_thread, work_thread].map(&:join)
+
+  private
+
+  attr_reader :count_lines
+
+  def work_thread = Thread.new { Main.new(options: { count_lines: }).call }
+
+  def memory_measurer_thread = Thread.new do
+    sleep CHECK_USAGE_INTERVAL_SEC
+    current_memory_usage_mb = `ps -o rss= -p #{Process.pid}`.to_i / 1024
+    if current_memory_usage_mb > MEMORY_USAGE_LIMIT_MB
+      puts "MEMORY USAGE: #{current_memory_usage_mb} MB, BUT LIMIT: #{MEMORY_USAGE_LIMIT_MB}"
+      exit
+    end
   end
 end
 

From aeb309256c293ae583fafe91b7dee9d0b424a586 Mon Sep 17 00:00:00 2001
From: Nikita <Nikita>
Date: Sun, 16 Mar 2025 11:31:53 +0300
Subject: [PATCH 3/4] [First] optimizing users and sessions collecting

---
 main.rb     | 4 ++--
 measurer.rb | 8 +++++---
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/main.rb b/main.rb
index c74e162e..104ed6f1 100644
--- a/main.rb
+++ b/main.rb
@@ -22,8 +22,8 @@ def work
   
     file_lines.each do |line|
       cols = line.split(',')
-      users = users + [parse_user(line)] if cols[0] == 'user'
-      sessions = sessions + [parse_session(line)] if cols[0] == 'session'
+      users << parse_user(line) if cols[0] == 'user'
+      sessions << parse_session(line) if cols[0] == 'session'
     end
   
     # Отчёт в json
diff --git a/measurer.rb b/measurer.rb
index beae5245..36a2384d 100644
--- a/measurer.rb
+++ b/measurer.rb
@@ -4,7 +4,7 @@ class Measurer
   MEMORY_USAGE_LIMIT_MB = 70
   CHECK_USAGE_INTERVAL_SEC = 1
 
-  def initialize(count_lines)
+  def initialize(count_lines: nil)
     @count_lines = count_lines
   end
 
@@ -20,11 +20,13 @@ def memory_measurer_thread = Thread.new do
     sleep CHECK_USAGE_INTERVAL_SEC
     current_memory_usage_mb = `ps -o rss= -p #{Process.pid}`.to_i / 1024
     if current_memory_usage_mb > MEMORY_USAGE_LIMIT_MB
-      puts "MEMORY USAGE: #{current_memory_usage_mb} MB, BUT LIMIT: #{MEMORY_USAGE_LIMIT_MB}"
+      puts "MEMORY USAGE: #{current_memory_usage_mb} MB, BUT LIMIT: #{MEMORY_USAGE_LIMIT_MB}. TERMINATING."
       exit
+    else
+      puts "MEMORY USAGE: #{current_memory_usage_mb} MB"
     end
   end
 end
 
 # Zero iteration:
-# 15_000 lines: 103 MB
+# 15_000 lines: 57 MB (optimizing users and sessions collecting)

From 69fa2257a3990d5832d1c6d99c653ed26fccd3f7 Mon Sep 17 00:00:00 2001
From: Nikita <Nikita>
Date: Sun, 16 Mar 2025 16:39:46 +0300
Subject: [PATCH 4/4] [Second] report generation on fly

---
 Gemfile                  |   1 +
 Gemfile.lock             |   9 +
 README.md                |   8 +-
 case-study-template.md   |  38 ++-
 main.rb                  | 195 +++++++---------
 measurer.rb              |  20 +-
 profiles/memory_profiler | 489 +++++----------------------------------
 profiles/stackprof.dump  | Bin 5039 -> 3176 bytes
 spec/main_spec.rb        |   2 +-
 spec/performance_spec.rb |   8 +
 10 files changed, 196 insertions(+), 574 deletions(-)
 create mode 100644 spec/performance_spec.rb

diff --git a/Gemfile b/Gemfile
index ba961d0a..2be733cc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,3 +8,4 @@ gem 'ruby-prof'
 gem 'memory_profiler'
 gem 'rspec'
 gem 'byebug'
+gem 'rspec-benchmark'
\ No newline at end of file
diff --git a/Gemfile.lock b/Gemfile.lock
index 293b5584..c73aac59 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,6 +1,9 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    benchmark-malloc (0.2.0)
+    benchmark-perf (0.6.0)
+    benchmark-trend (0.4.0)
     byebug (11.1.3)
     diff-lcs (1.6.0)
     memory_profiler (1.1.0)
@@ -8,6 +11,11 @@ GEM
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
       rspec-mocks (~> 3.13.0)
+    rspec-benchmark (0.6.0)
+      benchmark-malloc (~> 0.2)
+      benchmark-perf (~> 0.6)
+      benchmark-trend (~> 0.4)
+      rspec (>= 3.0)
     rspec-core (3.13.3)
       rspec-support (~> 3.13.0)
     rspec-expectations (3.13.3)
@@ -28,6 +36,7 @@ DEPENDENCIES
   byebug
   memory_profiler
   rspec
+  rspec-benchmark
   ruby-prof
   stackprof
 
diff --git a/README.md b/README.md
index 934cd8a2..56923c7a 100644
--- a/README.md
+++ b/README.md
@@ -46,10 +46,10 @@ puts "MEMORY USAGE: %d MB" % (`ps -o rss= -p #{Process.pid}`.to_i / 1024)"
 - файл `case-study.md` с описанием проделанной оптимизации;
 
 ## Checklist
-- [ ] Потренироваться с `memory_profiler`
-- [ ] Потренироваться с `ruby-prof` в режиме `CallTree` c визуализацией в `QCachegrind`;
-- [ ] Потренироваться с `stackprof` + `CLI` и `Speedscope`
-- [ ] Потренироваться со вторым тредом для мониторинга памяти
+- [x] Потренироваться с `memory_profiler`
+- [x] Потренироваться с `ruby-prof` в режиме `CallTree` c визуализацией в `QCachegrind`;
+- [x] Потренироваться с `stackprof` + `CLI` и `Speedscope`
+- [x] Потренироваться со вторым тредом для мониторинга памяти
 
 ## Формат шагов case-study
 Каждый шаг оптимизации в `case-study` должен содержать четыре составляющих:
diff --git a/case-study-template.md b/case-study-template.md
index c3279664..08487d99 100644
--- a/case-study-template.md
+++ b/case-study-template.md
@@ -12,44 +12,38 @@
 Я решил исправить эту проблему, оптимизировав эту программу.
 
 ## Формирование метрики
-Для того, чтобы понимать, дают ли мои изменения положительный эффект на быстродействие программы я придумал использовать такую метрику: *тут ваша метрика*
+Для того, чтобы понимать, дают ли мои изменения положительный эффект на быстродействие программы я придумал использовать такую метрику: количество потребляемой памяти процессом
 
 ## Гарантия корректности работы оптимизированной программы
 Программа поставлялась с тестом. Выполнение этого теста в фидбек-лупе позволяет не допустить изменения логики программы при оптимизации.
 
 ## Feedback-Loop
-Для того, чтобы иметь возможность быстро проверять гипотезы я выстроил эффективный `feedback-loop`, который позволил мне получать обратную связь по эффективности сделанных изменений за *время, которое у вас получилось*
+Для того, чтобы иметь возможность быстро проверять гипотезы я выстроил эффективный `feedback-loop`, который позволил мне получать обратную связь по эффективности сделанных изменений за несколько секунд (запуск measurer -> запуск profiler -> анализ)
 
-Вот как я построил `feedback_loop`: *как вы построили feedback_loop*
+Вот как я построил `feedback_loop`:
+  - Вынес вычисление метрики в Measurer, в котором запускаются 2 потока - один выполняет бизнес логику, а второй выступает предохранителем при использовании процессом памяти - больше заданного лимита
+  - Вынес профилирование в Profiler
 
 ## Вникаем в детали системы, чтобы найти главные точки роста
-Для того, чтобы найти "точки роста" для оптимизации я воспользовался *инструментами, которыми вы воспользовались*
+Для того, чтобы найти "точки роста" для оптимизации я воспользовался memory_profiler, ruby-prof, stackprof
 
 Вот какие проблемы удалось найти и решить
 
 ### Ваша находка №1
-- какой отчёт показал главную точку роста
-- как вы решили её оптимизировать
-- как изменилась метрика
-- как изменился отчёт профилировщика
+- Одну из главных точек роста я выявил в отчёте memory_profile - модификация массива не in_place
+- Убрал лишние аллокации
+- Метрика изменилась, но не сильно с 80 МБ до 57 для 15_000 строк 
+- Количество общих аллокаций по Array стало меньше, но не сильно
 
 ### Ваша находка №2
-- какой отчёт показал главную точку роста
-- как вы решили её оптимизировать
-- как изменилась метрика
-- как изменился отчёт профилировщика
-
-### Ваша находка №X
-- какой отчёт показал главную точку роста
-- как вы решили её оптимизировать
-- как изменилась метрика
-- как изменился отчёт профилировщика
+- Понял (по подсказке + отчёту memory_profiler), что для значительного буста по памяти необходимо составлять отчёт на лету, без хранения сессий и пользователей, то есть в каждый момент времени будет обрабатываться только один пользователь.
+- Добавил составление отчёта на лету при чтении каждой строки
+- Метрика изменилась с 57 для 15_000 МБ до 38 для полного объёма 
+- Значительно уменьшилось количество общий аллокаций по Array и другим классам
 
 ## Результаты
 В результате проделанной оптимизации наконец удалось обработать файл с данными.
-Удалось улучшить метрику системы с *того, что у вас было в начале, до того, что получилось в конце* и уложиться в заданный бюджет.
-
-*Какими ещё результами можете поделиться*
+Удалось улучшить метрику системы с 15_000 lines: 57 MB, до полной обработки: 38 MB и уложиться в заданный бюджет.
 
 ## Защита от регрессии производительности
-Для защиты от потери достигнутого прогресса при дальнейших изменениях программы *о performance-тестах, которые вы написали*
+Для защиты от потери достигнутого прогресса при дальнейших изменениях программы были добавлены тесты, проверяющие корректность бизнес-логики и укладывание в заданные лимиты
\ No newline at end of file
diff --git a/main.rb b/main.rb
index 104ed6f1..a9f5c3ac 100644
--- a/main.rb
+++ b/main.rb
@@ -4,142 +4,111 @@ class Main
   def initialize(options: {})
     @source_file_name = options[:source_file_name] || 'data_large.txt'
     @count_lines = options[:count_lines]
-    @is_print_memory_usage = options[:is_print_memory_usage] || false
+    @current_user = nil
+    @current_stat = nil
   end
 
   def call = work
 
   private
 
-  attr_reader :source_file_name, :count_lines, :is_print_memory_usage
+  attr_reader :source_file_name, :count_lines
 
   def work
     `head -n #{count_lines} #{source_file_name} > #{PARTIAL_VOLUME_FILE_NAME}` if count_lines
-    file_lines = File.read(count_lines ? PARTIAL_VOLUME_FILE_NAME : source_file_name).split("\n")
-
-    users = []
-    sessions = []
-  
-    file_lines.each do |line|
-      cols = line.split(',')
-      users << parse_user(line) if cols[0] == 'user'
-      sessions << parse_session(line) if cols[0] == 'session'
-    end
-  
-    # Отчёт в json
-    #   - Сколько всего юзеров +
-    #   - Сколько всего уникальных браузеров +
-    #   - Сколько всего сессий +
-    #   - Перечислить уникальные браузеры в алфавитном порядке через запятую и капсом +
-    #
-    #   - По каждому пользователю
-    #     - сколько всего сессий +
-    #     - сколько всего времени +
-    #     - самая длинная сессия +
-    #     - браузеры через запятую +
-    #     - Хоть раз использовал IE? +
-    #     - Всегда использовал только Хром? +
-    #     - даты сессий в порядке убывания через запятую +
-  
+    
     report = {}
-  
-    report[:totalUsers] = users.count
-  
-    # Подсчёт количества уникальных браузеров
-    uniqueBrowsers = []
-    sessions.each do |session|
-      browser = session['browser']
-      uniqueBrowsers += [browser] if uniqueBrowsers.all? { |b| b != browser }
-    end
-  
-    report['uniqueBrowsersCount'] = uniqueBrowsers.count
-  
-    report['totalSessions'] = sessions.count
-  
-    report['allBrowsers'] =
-      sessions
-        .map { |s| s['browser'] }
-        .map { |b| b.upcase }
-        .sort
-        .uniq
-        .join(',')
-  
-    # Статистика по пользователям
-    users_objects = []
-  
-    users.each do |user|
-      attributes = user
-      user_sessions = sessions.select { |session| session['user_id'] == user['id'] }
-      user_object = User.new(attributes: attributes, sessions: user_sessions)
-      users_objects = users_objects + [user_object]
-    end
-  
-    report['usersStats'] = {}
-  
-    # Собираем количество сессий по пользователям
-    collect_stats_from_users(report, users_objects) do |user|
-      { 'sessionsCount' => user.sessions.count }
-    end
-  
-    # Собираем количество времени по пользователям
-    collect_stats_from_users(report, users_objects) do |user|
-      { 'totalTime' => user.sessions.map {|s| s['time']}.map {|t| t.to_i}.sum.to_s + ' min.' }
-    end
-  
-    # Выбираем самую длинную сессию пользователя
-    collect_stats_from_users(report, users_objects) do |user|
-      { 'longestSession' => user.sessions.map {|s| s['time']}.map {|t| t.to_i}.max.to_s + ' min.' }
-    end
-  
-    # Браузеры пользователя через запятую
-    collect_stats_from_users(report, users_objects) do |user|
-      { 'browsers' => user.sessions.map {|s| s['browser']}.map {|b| b.upcase}.sort.join(', ') }
-    end
-  
-    # Хоть раз использовал IE?
-    collect_stats_from_users(report, users_objects) do |user|
-      { 'usedIE' => user.sessions.map{|s| s['browser']}.any? { |b| b.upcase =~ /INTERNET EXPLORER/ } }
-    end
-  
-    # Всегда использовал только Chrome?
-    collect_stats_from_users(report, users_objects) do |user|
-      { 'alwaysUsedChrome' => user.sessions.map{|s| s['browser']}.all? { |b| b.upcase =~ /CHROME/ } }
-    end
-  
-    # Даты сессий через запятую в обратном порядке в формате iso8601
-    collect_stats_from_users(report, users_objects) do |user|
-      { 'dates' => user.sessions.map{|s| s['date']}.map {|d| Date.parse(d)}.sort.reverse.map { |d| d.iso8601 } }
+    sessions_count = 0
+    users_count = 0
+    uniq_browsers = Set.new
+
+    File.open('result.json', 'w') do |result_file|
+      result_file.write('{"usersStats":{')
+
+      File.foreach(count_lines ? PARTIAL_VOLUME_FILE_NAME : source_file_name).each do |line|
+        fields = line.split(',')
+        case fields[0]
+        when 'session'
+          session = parse_session(fields)
+          sessions_count += 1
+          uniq_browsers.add(session['browser'])
+          @current_stat = build_current_stat(@current_user, session)
+        when 'user'
+          write_user_stat(result_file)
+          @current_user = parse_user(fields)
+          @current_stat = build_initial_stat
+          users_count += 1
+        end
+      end
+
+      write_user_stat(result_file, with_delimeter: false)
+
+      result_file.write("},\"totalUsers\":#{users_count},\"uniqueBrowsersCount\":#{uniq_browsers.count},\"totalSessions\":#{sessions_count},\"allBrowsers\":\"#{uniq_browsers.sort.join(',')}\"}\n")
     end
-  
-    File.write('result.json', "#{report.to_json}\n")
   end
 
-  def parse_user(user)
-    fields = user.split(',')
-    parsed_result = {
+  def write_user_stat(file, with_delimeter: true)
+    return unless @current_user
+
+    file.write("\"#{@current_user['key']}\":#{build_final_stat.to_json}")
+    file.write(",") if with_delimeter
+
+    @current_user = nil
+  end
+
+  def build_final_stat
+    {
+      'sessionsCount' => @current_stat['sessionsCount'],
+      'totalTime' => "#{@current_stat['totalTime']} min.",
+      'longestSession' => "#{@current_stat['longestSession']} min.",
+      'browsers' => @current_stat['browsers'].sort.join(', '),
+      'usedIE' => @current_stat['usedIE'],
+      'alwaysUsedChrome' => @current_stat['alwaysUsedChrome'],
+      'dates' => @current_stat['dates'].sort.reverse
+    }
+  end
+
+  def build_current_stat(user, session)
+    {
+      'sessionsCount' => @current_stat['sessionsCount'] + 1,
+      'totalTime' => @current_stat['totalTime'] + session['time'].to_i,
+      'longestSession' => @current_stat['longestSession'] > session['time'] ? @current_stat['longestSession'] : session['time'],
+      'browsers' => @current_stat['browsers'] << session['browser'],
+      'usedIE' => @current_stat['usedIE'] ? true : !!(session['browser'] =~ /INTERNET EXPLORER/),
+      'alwaysUsedChrome' => @current_stat['alwaysUsedChrome'] ? !!(session['browser'].upcase =~ /CHROME/) : false,
+      'dates' => @current_stat['dates'] << Date.strptime(session['date'], '%Y-%m-%d').iso8601
+    }
+  end
+
+  def build_initial_stat
+    {
+      'sessionsCount' => 0,
+      'totalTime' => 0,
+      'longestSession' => 0,
+      'browsers' => [],
+      'usedIE' => false,
+      'alwaysUsedChrome' => true,
+      'dates' => []
+    }
+  end
+
+  def parse_user(fields)
+    {
       'id' => fields[1],
       'first_name' => fields[2],
       'last_name' => fields[3],
       'age' => fields[4],
+      'key' => "#{fields[2]} #{fields[3]}"
     }
   end
   
-  def parse_session(session)
-    fields = session.split(',')
-    parsed_result = {
+  def parse_session(fields)
+    {
       'user_id' => fields[1],
       'session_id' => fields[2],
-      'browser' => fields[3],
-      'time' => fields[4],
+      'browser' => fields[3].upcase,
+      'time' => fields[4].to_i,
       'date' => fields[5],
     }
   end
-  
-  def collect_stats_from_users(report, users_objects, &block)
-    users_objects.each do |user|
-      user_key = "#{user.attributes['first_name']}" + ' ' + "#{user.attributes['last_name']}"
-      report['usersStats'][user_key] ||= {}
-      report['usersStats'][user_key] = report['usersStats'][user_key].merge(block.call(user))
-    end
-  end
 end
diff --git a/measurer.rb b/measurer.rb
index 36a2384d..514d6053 100644
--- a/measurer.rb
+++ b/measurer.rb
@@ -14,19 +14,23 @@ def call = [memory_measurer_thread, work_thread].map(&:join)
 
   attr_reader :count_lines
 
-  def work_thread = Thread.new { Main.new(options: { count_lines: }).call }
+  def work_thread = @work_thread ||= Thread.new { Main.new(options: { count_lines: }).call }
 
   def memory_measurer_thread = Thread.new do
-    sleep CHECK_USAGE_INTERVAL_SEC
-    current_memory_usage_mb = `ps -o rss= -p #{Process.pid}`.to_i / 1024
-    if current_memory_usage_mb > MEMORY_USAGE_LIMIT_MB
-      puts "MEMORY USAGE: #{current_memory_usage_mb} MB, BUT LIMIT: #{MEMORY_USAGE_LIMIT_MB}. TERMINATING."
-      exit
-    else
-      puts "MEMORY USAGE: #{current_memory_usage_mb} MB"
+    while work_thread.alive?
+      sleep CHECK_USAGE_INTERVAL_SEC
+      current_memory_usage_mb = `ps -o rss= -p #{Process.pid}`.to_i / 1024
+      if current_memory_usage_mb > MEMORY_USAGE_LIMIT_MB
+        puts "MEMORY USAGE: #{current_memory_usage_mb} MB, BUT LIMIT: #{MEMORY_USAGE_LIMIT_MB}. TERMINATING."
+        exit
+      else
+        puts "MEMORY USAGE: #{current_memory_usage_mb} MB"
+      end
     end
   end
 end
 
 # Zero iteration:
 # 15_000 lines: 57 MB (optimizing users and sessions collecting)
+# First iteration:
+# full: 38 MB (10 sec) (optimizing file stream processing)
\ No newline at end of file
diff --git a/profiles/memory_profiler b/profiles/memory_profiler
index b22436b2..7e7cfdce 100644
--- a/profiles/memory_profiler
+++ b/profiles/memory_profiler
@@ -1,506 +1,143 @@
-Total allocated: 3791101592 bytes (1471886 objects)
-Total retained:  4249 bytes (9 objects)
+Total allocated: 19320 bytes (29 objects)
+Total retained:  80 bytes (1 objects)
 
 allocated memory by gem
 -----------------------------------
-3791101592  other
+     19160  other
+       160  set
 
 allocated memory by file
 -----------------------------------
-3791101032  /home/nikita/rails_optimization/task_2/main.rb
+     18600  /home/nikita/rails_optimization/task_2/main.rb
        560  /home/nikita/rails_optimization/task_2/profiler.rb
+       160  /usr/share/rvm/rubies/ruby-3.3.0/lib/ruby/3.3.0/set.rb
 
 allocated memory by location
 -----------------------------------
-2585606480  /home/nikita/rails_optimization/task_2/main.rb:26
- 933571968  /home/nikita/rails_optimization/task_2/main.rb:72
-  85937936  /home/nikita/rails_optimization/task_2/main.rb:25
-  84737936  /home/nikita/rails_optimization/task_2/main.rb:74
-  29275553  /home/nikita/rails_optimization/task_2/main.rb:111
-  14467200  /home/nikita/rails_optimization/task_2/main.rb:24
-  12446720  /home/nikita/rails_optimization/task_2/main.rb:130
-   6559560  /home/nikita/rails_optimization/task_2/main.rb:142
-   5143600  /home/nikita/rails_optimization/task_2/main.rb:144
-   4351680  /home/nikita/rails_optimization/task_2/main.rb:96
-   4065280  /home/nikita/rails_optimization/task_2/main.rb:131
-   3882366  /home/nikita/rails_optimization/task_2/main.rb:18
-   3623624  /home/nikita/rails_optimization/task_2/main.rb:101
-   2731036  /home/nikita/rails_optimization/task_2/main.rb:114
-   2197240  /home/nikita/rails_optimization/task_2/main.rb:106
-   2063760  /home/nikita/rails_optimization/task_2/main.rb:86
-   2063760  /home/nikita/rails_optimization/task_2/main.rb:91
-   2020480  /home/nikita/rails_optimization/task_2/main.rb:120
-   1653120  /home/nikita/rails_optimization/task_2/main.rb:73
-   1470504  /home/nikita/rails_optimization/task_2/main.rb:62
-    937080  /home/nikita/rails_optimization/task_2/main.rb:143
-    734720  /home/nikita/rails_optimization/task_2/main.rb:121
-    734720  /home/nikita/rails_optimization/task_2/main.rb:81
-    229536  /home/nikita/rails_optimization/task_2/main.rb:77
-    203344  /home/nikita/rails_optimization/task_2/main.rb:63
-    203304  /home/nikita/rails_optimization/task_2/main.rb:61
-    183152  /home/nikita/rails_optimization/task_2/main.rb:52
-      2645  /home/nikita/rails_optimization/task_2/main.rb:65
-      1640  /home/nikita/rails_optimization/task_2/main.rb:64
-       728  /home/nikita/rails_optimization/task_2/main.rb:17
+      8680  /home/nikita/rails_optimization/task_2/main.rb:28
+      8560  /home/nikita/rails_optimization/task_2/main.rb:25
+       728  /home/nikita/rails_optimization/task_2/main.rb:18
        560  /home/nikita/rails_optimization/task_2/profiler.rb:48
-       160  /home/nikita/rails_optimization/task_2/main.rb:44
-        40  /home/nikita/rails_optimization/task_2/main.rb:20
-        40  /home/nikita/rails_optimization/task_2/main.rb:21
-        40  /home/nikita/rails_optimization/task_2/main.rb:49
+       280  /home/nikita/rails_optimization/task_2/main.rb:46
+       160  /home/nikita/rails_optimization/task_2/main.rb:20
+       160  /usr/share/rvm/rubies/ruby-3.3.0/lib/ruby/3.3.0/set.rb:244
+       112  /home/nikita/rails_optimization/task_2/main.rb:26
+        40  /home/nikita/rails_optimization/task_2/main.rb:23
         40  /home/nikita/rails_optimization/task_2/main.rb:5
-        40  /home/nikita/rails_optimization/task_2/main.rb:68
 
 allocated memory by class
 -----------------------------------
-3706736736  Array
-  47273903  String
-  21586016  Hash
-  13478424  MatchData
-   1829376  Date
-    183680  User
-      8688  File
-      3609  Regexp
-       560  Proc
+     16880  File
+       960  Hash
+       720  String
        248  IO
-       120  JSON::Ext::Generator::State
+       160  Enumerator
+        80  Array
         80  Main
         80  Process::Status
         72  Thread::Mutex
+        40  Set
 
 allocated objects by gem
 -----------------------------------
-   1471886  other
+        28  other
+         1  set
 
 allocated objects by file
 -----------------------------------
-   1471882  /home/nikita/rails_optimization/task_2/main.rb
+        24  /home/nikita/rails_optimization/task_2/main.rb
          4  /home/nikita/rails_optimization/task_2/profiler.rb
+         1  /usr/share/rvm/rubies/ruby-3.3.0/lib/ruby/3.3.0/set.rb
 
 allocated objects by location
 -----------------------------------
-    387380  /home/nikita/rails_optimization/task_2/main.rb:111
-    235408  /home/nikita/rails_optimization/task_2/main.rb:24
-    203264  /home/nikita/rails_optimization/task_2/main.rb:130
-    160720  /home/nikita/rails_optimization/task_2/main.rb:142
-     80816  /home/nikita/rails_optimization/task_2/main.rb:26
-     57062  /home/nikita/rails_optimization/task_2/main.rb:96
-     39184  /home/nikita/rails_optimization/task_2/main.rb:25
-     38868  /home/nikita/rails_optimization/task_2/main.rb:101
-     32151  /home/nikita/rails_optimization/task_2/main.rb:144
-     32144  /home/nikita/rails_optimization/task_2/main.rb:120
-     30005  /home/nikita/rails_optimization/task_2/main.rb:18
-     27552  /home/nikita/rails_optimization/task_2/main.rb:86
-     27552  /home/nikita/rails_optimization/task_2/main.rb:91
-     25409  /home/nikita/rails_optimization/task_2/main.rb:62
-     25408  /home/nikita/rails_optimization/task_2/main.rb:131
-     22611  /home/nikita/rails_optimization/task_2/main.rb:106
-     13776  /home/nikita/rails_optimization/task_2/main.rb:73
-      9184  /home/nikita/rails_optimization/task_2/main.rb:143
-      9184  /home/nikita/rails_optimization/task_2/main.rb:74
-      4592  /home/nikita/rails_optimization/task_2/main.rb:121
-      4592  /home/nikita/rails_optimization/task_2/main.rb:72
-      4592  /home/nikita/rails_optimization/task_2/main.rb:81
-       400  /home/nikita/rails_optimization/task_2/main.rb:52
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-
-
-Retained String Report
------------------------------------
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-         1  "((?<!\\d)\\d+\\s*(?:(?::\\s*\\d+(?:\\s*:\\s*\\d+(?:[,.]\\d*)?)?|h(?:\\s*\\d+m?(?:\\s*\\d+s?)?)?)(?:\\s*[ap](?:m\\b|\\.m\\.))?|[ap](?:m\\b|\\.m\\.)))(?:\\s*((?:gmt|utc?)?[-+]\\d+(?:[,.:]\\d+(?::\\d+)?)?|(?-i:[[:alpha:].\\s]+)("
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-         1  "_comp"
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+         1  "},\"totalUsers\":0,\"uniqueBrowsersCount\":0,\"totalSessions\":0,\"allBrowsers\":\"\"}\n"
+         1  /home/nikita/rails_optimization/task_2/main.rb:46
 
diff --git a/profiles/stackprof.dump b/profiles/stackprof.dump
index 447022e8b8c0571cdb08ffb51537139f22f0690d..3a3afcfa0d0f688769d68b47ddad492bdcd0d9d3 100644
GIT binary patch
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diff --git a/spec/main_spec.rb b/spec/main_spec.rb
index 46e6232d..92c6f6c3 100644
--- a/spec/main_spec.rb
+++ b/spec/main_spec.rb
@@ -27,7 +27,7 @@
 
   it "записывает в файл корректный результат" do
     Main.new(options: { source_file_name: "data.txt" }).call
-    expected_result = '{"totalUsers":3,"uniqueBrowsersCount":14,"totalSessions":15,"allBrowsers":"CHROME 13,CHROME 20,CHROME 35,CHROME 6,FIREFOX 12,FIREFOX 32,FIREFOX 47,INTERNET EXPLORER 10,INTERNET EXPLORER 28,INTERNET EXPLORER 35,SAFARI 17,SAFARI 29,SAFARI 39,SAFARI 49","usersStats":{"Leida Cira":{"sessionsCount":6,"totalTime":"455 min.","longestSession":"118 min.","browsers":"FIREFOX 12, INTERNET EXPLORER 28, INTERNET EXPLORER 28, INTERNET EXPLORER 35, SAFARI 29, SAFARI 39","usedIE":true,"alwaysUsedChrome":false,"dates":["2017-09-27","2017-03-28","2017-02-27","2016-10-23","2016-09-15","2016-09-01"]},"Palmer Katrina":{"sessionsCount":5,"totalTime":"218 min.","longestSession":"116 min.","browsers":"CHROME 13, CHROME 6, FIREFOX 32, INTERNET EXPLORER 10, SAFARI 17","usedIE":true,"alwaysUsedChrome":false,"dates":["2017-04-29","2016-12-28","2016-12-20","2016-11-11","2016-10-21"]},"Gregory Santos":{"sessionsCount":4,"totalTime":"192 min.","longestSession":"85 min.","browsers":"CHROME 20, CHROME 35, FIREFOX 47, SAFARI 49","usedIE":false,"alwaysUsedChrome":false,"dates":["2018-09-21","2018-02-02","2017-05-22","2016-11-25"]}}}' + "\n"
+    expected_result = '{"usersStats":{"Leida Cira":{"sessionsCount":6,"totalTime":"455 min.","longestSession":"118 min.","browsers":"FIREFOX 12, INTERNET EXPLORER 28, INTERNET EXPLORER 28, INTERNET EXPLORER 35, SAFARI 29, SAFARI 39","usedIE":true,"alwaysUsedChrome":false,"dates":["2017-09-27","2017-03-28","2017-02-27","2016-10-23","2016-09-15","2016-09-01"]},"Palmer Katrina":{"sessionsCount":5,"totalTime":"218 min.","longestSession":"116 min.","browsers":"CHROME 13, CHROME 6, FIREFOX 32, INTERNET EXPLORER 10, SAFARI 17","usedIE":true,"alwaysUsedChrome":false,"dates":["2017-04-29","2016-12-28","2016-12-20","2016-11-11","2016-10-21"]},"Gregory Santos":{"sessionsCount":4,"totalTime":"192 min.","longestSession":"85 min.","browsers":"CHROME 20, CHROME 35, FIREFOX 47, SAFARI 49","usedIE":false,"alwaysUsedChrome":false,"dates":["2018-09-21","2018-02-02","2017-05-22","2016-11-25"]}},"totalUsers":3,"uniqueBrowsersCount":14,"totalSessions":15,"allBrowsers":"CHROME 13,CHROME 20,CHROME 35,CHROME 6,FIREFOX 12,FIREFOX 32,FIREFOX 47,INTERNET EXPLORER 10,INTERNET EXPLORER 28,INTERNET EXPLORER 35,SAFARI 17,SAFARI 29,SAFARI 39,SAFARI 49"}' + "\n"
     expect(File.read('result.json')).to eq(expected_result)
   end
 end
diff --git a/spec/performance_spec.rb b/spec/performance_spec.rb
new file mode 100644
index 00000000..36d7d44e
--- /dev/null
+++ b/spec/performance_spec.rb
@@ -0,0 +1,8 @@
+require_relative "spec_helper"
+
+describe Main do
+  it "использование памяти не превышает заданный лимит" do
+    described_class.new.call
+    expect((`ps -o rss= -p #{Process.pid}`.to_i / 1024)).to be < 70
+  end
+end