is not a very beautiful code, but it's just an example... # And it kinda works... require 'benchmark/ips' Rails.application.config.after_initialize do Rails.application.extend Module.new { def call(e) super Benchmark.ips do |x| x.report('Rails.application#call') do super end end super end } end
a trend putting so many `.freeze` here and there in the code I thought that made our codebase super ugly. I did no more want to see PRs that adds `.freeze` to String literals in the framework So I proposed the magic comment (ruby 2.3): # frozen-string-literal: true Not mainly in order to improve the speed but in order to stop people's code pollution!
become a little bit faster if you put this to all .rb files in Rails Then we could remove all explicit `.freeze` calls We need to add some `.dup` calls though
= app end def call(env) calls = [] trace = TracePoint.new(:call, :c_call) do |tp| calls << [tp.defined_class, tp.method_id, tp.lineno] end trace.enable ret = @app.call env trace.disable pp calls.group_by(&:itself).map {|k, v| {k => v.length}}.sort_by {|h| -h.values.first} ret end end use MethodCounter
that kinda works... $RACK_BENCH_BEFORE_CALL = $RACK_BENCH_AFTER_CALL = nil module RackBench def call(*) p "#{self.class}: before call" => Time.now - $RACK_BENCH_BEFORE_CALL if $RACK_BENCH_BEFORE_CALL $RACK_BENCH_BEFORE_CALL = Time.now ret = super p "#{self.class}: after call" => Time.now - $RACK_BENCH_AFTER_CALL if $RACK_BENCH_AFTER_CALL $RACK_BENCH_AFTER_CALL = Time.now ret end end Rails.configuration.middleware.each do |m| if m.klass.respond_to? :prepend m.klass.prepend RackBench else m.klass.singleton_class.prepend RackBench end end
it looks up the template And creates another buffer, runs another template compilation & rendering per each partial We don't always need a new context for a partial Simply concatenating templates (just like PHP's include) would be enough in some cases e.g. `<%= render 'footer' %>`
class ERB def call(template) # First, convert to BINARY, so in case the encoding is # wrong, we can still find an encoding tag # (<%# encoding %>) inside the String using a regular # expression template_source = template.source.dup.force_encoding(Encoding::ASCII_8BIT) erb = template_source.gsub(ENCODING_TAG, '') encoding = $2 erb.force_encoding valid_encoding(template.source.dup, encoding) # Always make sure we return a String in the default_internal erb.encode! self.class.erb_implementation.new( erb, :escape => (self.class.escape_whitelist.include? template.type), :trim => (self.class.erb_trim_mode == "-") ).src ennnnnd
given template source .`force_encoding` the source to Binary Extract the magic encoding comment from the template source `.dup` the given template source again `.force_enconding` the template source if a magic comment was found `.force_enconding` the ERB template `.encode!` the ERB template
view file? Who actually puts an encoding magic comment in the view files? We see some test cases concerning Shift JIS encoded templates, but I'm sure nobody does this in Japan
enough, directly compose an SQL statement, just like we were doing in AR1 and 2 If the query is not simple enough, fallback to `super` (AR default behavior) No caching! (because building the whole query is as cheap as computing a cache key)
bit shortened for the presentation slide module Arenai module Base def find(*ids) return super unless ids.length == 1 return super if block_given? || primary_key.nil? || default_scopes.any? || columns_hash.include?(inheritance_column) || ids.first.kind_of?(Array) id = ids.first return super if !((Fixnum === id) || (String === id)) # SELECT "users".* FROM "users" WHERE "users"."id" = $1 [["id", 1]] find_by_sql("SELECT #{quoted_table_name}.* FROM #{quoted_table_name} WHERE #{quoted_table_name}.#{connection.quote_column_name primary_key} = $1", [[columns_hash[primary_key], id]]).first ennnd
attribute in a model instance This brings a flexibility But it's sometimes too much For example, think of a batch system that selects 100,000 records that has 20 columns. That would create 2,000,000 "attribute" Objects I'm thinking of a plugin that can reduce this Object creation somehow
module Rails module Initializable def run_initializers(group=:default, *args) return if instance_variable_defined?(:@ran) initializers.tsort_each do |initializer| + now = Time.now initializer.run(*args) if initializer.belongs_to?(group) + p initializer.name => Time.now - now if Time.now - now > 0.1 end @ran = true end
Bundler class Runtime < Environment def require(*groups) groups.map!(&:to_sym) groups = [:default] if groups.empty? @definition.dependencies.each do |dep| # Skip the dependency if it is not in any of the requested # groups next unless (dep.groups & groups).any? && dep.current_platform? + now = Time.now required_file = nil ... end + p dep.name => Time.now - now ennnnd
Our App Boot (And so I sent dozens of patches) Most of them just didn't use `AS.on_load` properly e.g.) https:/ /github.com/zdennis/ activerecord-import/pull/136
my MBP(SSD) When booting pry, it scans through all the installed gems and tries to require every gem that matches pry-* (see lib/pry/plugins.rb) You do not at all have to require pry-* via Bundler. You might not need them until you boot pry
own path, and its own namespace inside Can’t all these gems be merged into one directory so we could make $LOAD_PATH shorter, then make require faster?
b = tp.binding case tp.event when :call p [tp.lineno, tp.defined_class, b.local_variable_get(:const_name)] when :c_call if b.local_variable_defined?(:const_name) p [tp.lineno, tp.defined_class, b.local_variable_get(:const_name), b.local_variable_get(:full), b.local_variable_get(:path)] else p [tp.lineno, tp.defined_class, b.local_variables] puts caller puts end end end end.enable
database file (AS/ values/unicode_tables.dat), which consumes time and memory I’m not sure if we still need this (doesn’t ruby have this?) I suppose we Japanese don’t use most of the features provided here
possibilities of improvements Everyone, do reveal your hacks! Let there be more alternatives That would bring the missing “Merbism” back to the community
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