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This PR adds the allocations to the instrumentation for template and
partial rendering.
Before:
```
Rendering posts/new.html.erb within layouts/application
Rendered posts/_form.html.erb (9.7ms)
Rendered posts/new.html.erb within layouts/application (10.9ms)
Completed 200 OK in 902ms (Views: 890.8ms | ActiveRecord: 0.8ms)
```
After:
```
Rendering posts/new.html.erb within layouts/application
Rendered posts/_form.html.erb (Duration: 7.1ms | Allocations: 6004)
Rendered posts/new.html.erb within layouts/application (Duration: 8.3ms | Allocations: 6654)
Completed 200 OK in 858ms (Views: 848.4ms | ActiveRecord: 0.4ms | Allocations: 1539564)
```
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In Ruby 2.3 or later, `String#+@` is available and `+@` is faster than `dup`.
```ruby
# frozen_string_literal: true
require "bundler/inline"
gemfile(true) do
source "https://rubygems.org"
gem "benchmark-ips"
end
Benchmark.ips do |x|
x.report('+@') { +"" }
x.report('dup') { "".dup }
x.compare!
end
```
```
$ ruby -v benchmark.rb
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
Warming up --------------------------------------
+@ 282.289k i/100ms
dup 187.638k i/100ms
Calculating -------------------------------------
+@ 6.775M (± 3.6%) i/s - 33.875M in 5.006253s
dup 3.320M (± 2.2%) i/s - 16.700M in 5.032125s
Comparison:
+@: 6775299.3 i/s
dup: 3320400.7 i/s - 2.04x slower
```
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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Enforce frozen string in Rubocop
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Plus a couple of related ActionPack patches.
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st0012/fix-partial-cache-logging
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Implement naive partial caching mechanism.
Add test for LogSubscriber
Use ActionView::Base#log_payload to store log_subscriber's payload, so we can pass cache result into it.
Fixed tests
Remove useless settings
Check if #log_payload exists before calling it. Because other classes also includes CacheHelper but don't have is attribute
Use @log_payload_for_partial_reder instead of #log_payload to carry ActionView's payload.
Update test's hash syntax
Add configuration to enable/disable fragment caching logging
Remove unless test and add new test to ensure cache info won't effect next rendering's log
Move :enable_fragment_cache_logging config from ActionView to ActionPack
Apply new config to tests
Update actionview's changelog
Update configuration guide
Improve actionview's changelog
Refactor PartialRenderer#render and log tests
Mute subscriber's log instead of disabling instrumentation.
Fix typo, remove useless comment and use new hash syntax
Improve actionpack's log_subscriber test
Fix rebase mistake
Apply new config to all caching intstrument actions
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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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We don't need to instrument another event as
`ActiveSupport::LogSubscriber` already tracks when the instrumentation
starts.
Close #23717
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we have started to render something, at the very beginning.
This helps to easily identify queries from controller vs views
Fixes #23710
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Augments the collection caching with some instrumentation that's logged.
For collections that have been cached like:
```ruby
<%= render partial: 'notifications/notification', collection: @notifications, cached: true %>
```
We'll output a line showing how many cache hits we had when rendering it:
```
Rendered collection of notifications/_notification.html.erb [0 / 100 cache hits] (3396.5ms)
```
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The Logger by default includes a guard which checks for the
logging level. By removing the custom logging guards, we can decouple
the logging guard from the logging action to be done.
This also follows the good practice listed on http://guides.rubyonrails.org/debugging_rails_applications.html#impact-of-logs-on-performance.
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Revert "drop one more string allocation"
This reverts commit 4d15661d6c46c86a62ee1fc358f4b3ef9dd9f2ea.
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