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Saves about 6 MB, about 40% faster.
**strip_heredoc.rb**
```ruby
require "active_support/core_ext/object/try"
require "get_process_mem"
class String
def strip_heredoc
indent = scan(/^[ \t]*(?=\S)/).min.try(:size) || 0
gsub(/^[ \t]{#{indent}}/, '')
end
end
if ENV["MEASURE_MEMORY"] == "yes"
mem = GetProcessMem.new
GC.start
GC.disable
10000.times do
<<-MSG.strip_heredoc
xhr and xml_http_request methods are deprecated in favor of
`get :index, xhr: true` and `post :create, xhr: true`
MSG
end
before = mem.mb
after = mem.mb
GC.enable
puts "Before: #{before} MiB"
puts "After: #{after} MiB"
puts "Diff: #{after - before} MiB"
end
```
**patched_strip_heredoc.rb**
```ruby
require "active_support/core_ext/object/try"
require "get_process_mem"
class String
def patched_strip_heredoc
gsub(/^#{scan(/^[ \t]*(?=\S)/).min}/, "".freeze)
end
end
if ENV["MEASURE_MEMORY"] == "yes"
mem = GetProcessMem.new
GC.start
GC.disable
10000.times do
<<-MSG.patched_strip_heredoc
xhr and xml_http_request methods are deprecated in favor of
`get :index, xhr: true` and `post :create, xhr: true`
MSG
end
before = mem.mb
after = mem.mb
GC.enable
puts "Before: #{before} MiB"
puts "After: #{after} MiB"
puts "Diff: #{after - before} MiB"
end
```
**Before**
```
$ MEASURE_MEMORY=yes ruby strip_heredoc.rb
Before: 44.73828125 MiB
After: 44.7734375 MiB
Diff: 0.03515625 MiB
```
**After**
```
$ MEASURE_MEMORY=yes ruby patched_strip_heredoc.rb
Before: 37.9765625 MiB
After: 38.015625 MiB
Diff: 0.0390625 MiB
```
`44.7734375 - 38.015625 = 6.75`
=> **Saves about 6.75 MiB**
**benchmark.rb**
```ruby
require "benchmark/ips"
require_relative "./strip_heredoc"
require_relative "./patched_strip_heredoc"
def original
<<-MSG.strip_heredoc
xhr and xml_http_request methods are deprecated in favor of
`get :index, xhr: true` and `post :create, xhr: true`
MSG
end
def patched
<<-MSG.patched_strip_heredoc
xhr and xml_http_request methods are deprecated in favor of
`get :index, xhr: true` and `post :create, xhr: true`
MSG
end
Benchmark.ips do |x|
x.report("original") { original }
x.report(" patched") { patched }
x.compare!
end
```
```
$ ruby -v benchmark.rb
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
Calculating -------------------------------------
original 5.652k i/100ms
patched 6.477k i/100ms
-------------------------------------------------
original 54.076k (± 5.7%) i/s - 271.296k
patched 74.557k (± 6.2%) i/s - 375.666k
Comparison:
patched: 74557.0 i/s
original: 54076.4 i/s - 1.38x slower
```
=> **About 38% faster**
1. Clone rails project `git clone git@github.com:rails/rails.git`
2. Apply this patch to
`activesupport/lib/active_support/core_ext/string/strip.rb`
3. `cd activesupport`
4. run `rake`
5. And tests passed:
```
➜ activesupport $ rake
/Users/Juan/.rubies/ruby-2.2.2/bin/ruby -w -I"lib:test"
"/Users/Juan/.rubies/ruby-2.2.2/lib/ruby/2.2.0/rake/rake_test_loader.rb"
"test/**/*_test.rb"
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......................................................................S.
SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
Finished in 15.343004s, 214.2344 runs/s, 24902.4898 assertions/s.
3287 runs, 382079 assertions, 0 failures, 0 errors, 48 skips
You have skipped tests. Run with --verbose for details.
```
|
