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path: root/actionpack/lib/action_dispatch/journey/nodes/node.rb
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* drop array allocations when building pathsAaron Patterson2015-08-181-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ```ruby require 'action_pack' require 'action_dispatch' require 'benchmark/ips' route_set = ActionDispatch::Routing::RouteSet.new routes = ActionDispatch::Routing::Mapper.new route_set ObjectSpace::AllocationTracer.setup(%i{path line type}) result = ObjectSpace::AllocationTracer.trace do 500.times do routes.resources :foo end end sorted = ObjectSpace::AllocationTracer.allocated_count_table.sort_by(&:last) sorted.each do |k,v| next if v == 0 p k => v end __END__ Before: {:T_SYMBOL=>11} {:T_REGEXP=>17} {:T_STRUCT=>6500} {:T_MATCH=>12004} {:T_OBJECT=>99009} {:T_DATA=>100088} {:T_HASH=>122015} {:T_STRING=>159637} {:T_IMEMO=>363134} {:T_ARRAY=>433056} After: {:T_SYMBOL=>11} {:T_REGEXP=>17} {:T_STRUCT=>6500} {:T_MATCH=>12004} {:T_OBJECT=>91009} {:T_DATA=>100088} {:T_HASH=>114013} {:T_STRING=>159637} {:T_ARRAY=>321056} {:T_IMEMO=>351133} ```
* drop string allocations for each resourceAaron Patterson2015-08-181-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Eagerly calculate and cache the name of Symbol objects in the path AST. This drops about 26 string allocations per resource: ```ruby require 'action_pack' require 'action_dispatch' require 'benchmark/ips' route_set = ActionDispatch::Routing::RouteSet.new routes = ActionDispatch::Routing::Mapper.new route_set ObjectSpace::AllocationTracer.setup(%i{path line type}) result = ObjectSpace::AllocationTracer.trace do 500.times do routes.resources :foo end end sorted = ObjectSpace::AllocationTracer.allocated_count_table.sort_by(&:last) sorted.each do |k,v| next if v == 0 p k => v end __END__ Before: {:T_SYMBOL=>11} {:T_REGEXP=>17} {:T_STRUCT=>6500} {:T_MATCH=>12004} {:T_OBJECT=>99009} {:T_DATA=>116084} {:T_HASH=>122015} {:T_STRING=>172647} {:T_IMEMO=>371132} {:T_ARRAY=>433056} After: {:T_SYMBOL=>11} {:T_REGEXP=>17} {:T_STRUCT=>6500} {:T_MATCH=>12004} {:T_OBJECT=>99009} {:T_DATA=>100088} {:T_HASH=>122015} {:T_STRING=>159637} {:T_IMEMO=>363134} {:T_ARRAY=>433056} ```
* drop object allocation during routes setupAaron Patterson2015-08-171-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit introduces a functional Path AST visitor and implements `each` on the AST in terms of the functional visitor. The functional visitor doesn't maintain state, so we only need to allocate one of them. Given this benchmark route file: ```ruby require 'action_pack' require 'action_dispatch' route_set = ActionDispatch::Routing::RouteSet.new routes = ActionDispatch::Routing::Mapper.new route_set ObjectSpace::AllocationTracer.setup(%i{path line type}) result = ObjectSpace::AllocationTracer.trace do 500.times{|i| routes.resource :omglol } end result.find_all { |k,v| k.first =~ /git\/rails/ }.sort_by { |k,v| v.first }.each { |k,v| p k => v } ``` node.rb line 17 was in our top 3 allocation spot: ``` {["/Users/aaron/git/rails/actionpack/lib/action_dispatch/journey/nodes/node.rb", 17, :T_OBJECT]=>[31526, 0, 28329, 0, 2, 1123160]} {["/Users/aaron/git/rails/actionpack/lib/action_dispatch/routing/mapper.rb", 2080, :T_IMEMO]=>[34002, 0, 30563, 0, 2, 1211480]} {["/Users/aaron/git/rails/actionpack/lib/action_dispatch/routing/mapper.rb", 2071, :T_IMEMO]=>[121934, 1, 109608, 0, 7, 4344400]} ``` This commit eliminates allocations at that place.
* avoid is_a? checksAaron Patterson2015-08-171-0/+2
| | | | add another predicate method so we can avoid is_a checks
* use predicate methods to avoid is_a? checksAaron Patterson2015-08-171-0/+2
| | | | | we may want to change the name of the class at some point, so it's better to use a predicate
* Freeze string literals when not mutated.schneems2015-07-191-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I wrote a utility that helps find areas where you could optimize your program using a frozen string instead of a string literal, it's called [let_it_go](https://github.com/schneems/let_it_go). After going through the output and adding `.freeze` I was able to eliminate the creation of 1,114 string objects on EVERY request to [codetriage](codetriage.com). How does this impact execution? To look at memory: ```ruby require 'get_process_mem' mem = GetProcessMem.new GC.start GC.disable 1_114.times { " " } before = mem.mb after = mem.mb GC.enable puts "Diff: #{after - before} mb" ``` Creating 1,114 string objects results in `Diff: 0.03125 mb` of RAM allocated on every request. Or 1mb every 32 requests. To look at raw speed: ```ruby require 'benchmark/ips' number_of_objects_reduced = 1_114 Benchmark.ips do |x| x.report("freeze") { number_of_objects_reduced.times { " ".freeze } } x.report("no-freeze") { number_of_objects_reduced.times { " " } } end ``` We get the results ``` Calculating ------------------------------------- freeze 1.428k i/100ms no-freeze 609.000 i/100ms ------------------------------------------------- freeze 14.363k (± 8.5%) i/s - 71.400k no-freeze 6.084k (± 8.1%) i/s - 30.450k ``` Now we can do some maths: ```ruby ips = 6_226k # iterations / 1 second call_time_before = 1.0 / ips # seconds per iteration ips = 15_254 # iterations / 1 second call_time_after = 1.0 / ips # seconds per iteration diff = call_time_before - call_time_after number_of_objects_reduced * diff * 100 # => 0.4530373333993266 miliseconds saved per request ``` So we're shaving off 1 second of execution time for every 220 requests. Is this going to be an insane speed boost to any Rails app: nope. Should we merge it: yep. p.s. If you know of a method call that doesn't modify a string input such as [String#gsub](https://github.com/schneems/let_it_go/blob/b0e2da69f0cca87ab581022baa43291cdf48638c/lib/let_it_go/core_ext/string.rb#L37) please [give me a pull request to the appropriate file](https://github.com/schneems/let_it_go/blob/b0e2da69f0cca87ab581022baa43291cdf48638c/lib/let_it_go/core_ext/string.rb#L37), or open an issue in LetItGo so we can track and freeze more strings. Keep those strings Frozen ![](https://www.dropbox.com/s/z4dj9fdsv213r4v/let-it-go.gif?dl=1)
* use a parser to extract the group parts from the pathAaron Patterson2014-05-291-0/+4
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* update AD::Journey to follow Rails coding conventionsFrancesco Rodriguez2012-12-201-5/+5
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* :nodoc: Journey because is not part of the public API [ci skip]Francesco Rodriguez2012-12-191-12/+12
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* Integrate Journey into Action DispatchAndrew White2012-12-191-0/+124
Move the Journey code underneath the ActionDispatch namespace so that we don't pollute the global namespace with names that may be used for models. Fixes rails/journey#49.