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explicitely.
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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
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Various grammar corrections and wrap to 80 characters.
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LookupContext is class name
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Given the following templates:
mailer/demo.html.erb
mailer/demo.en.html.erb
mailer/demo.pt.html.erb
Before this change for a locale that doesn't have its related file
the `mailer/demo.html.erb` will
be rendered even if `en` is the default locale.
Now `mailer/demo.en.html.erb` has precedence over the file without
locale.
Also, it is possible to give a fallback.
mailer/demo.pt.html.erb
mailer/demo.pt-BR.html.erb
So if the locale is `pt-PT`, `mailer/demo.pt.html.erb` will be
rendered given the right I18n fallback configuration.
Fixes #11884.
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The performance is almost the same with both implementations but this is
clear.
Before this patch:
Calculating -------------------------------------
small erb template 1452 i/100ms
-------------------------------------------------
small erb template 17462.1 (±13.3%) i/s - 85668 in 5.031395s
.Calculating -------------------------------------
small erb template with 1 partial
887 i/100ms
-------------------------------------------------
small erb template with 1 partial
8899.6 (±18.8%) i/s - 42576 in 5.009453s
.Calculating -------------------------------------
small erb template with 2 partials
666 i/100ms
-------------------------------------------------
small erb template with 2 partials
6821.5 (±8.8%) i/s - 33966 in 5.020791s
After the patch:
Calculating -------------------------------------
small erb template 1479 i/100ms
-------------------------------------------------
small erb template 15956.6 (±7.6%) i/s - 79866 in 5.036001s
.Calculating -------------------------------------
small erb template with 1 partial
841 i/100ms
-------------------------------------------------
small erb template with 1 partial
9242.2 (±6.9%) i/s - 46255 in 5.029497s
.Calculating -------------------------------------
small erb template with 2 partials
615 i/100ms
-------------------------------------------------
small erb template with 2 partials
6524.7 (±6.8%) i/s - 32595 in 5.020456s
You can find the benchmark code at
https://gist.github.com/rafaelfranca/dee31120cfdb1ddc3b56
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Using ruby-prof, I noticed that Set#add had the largest 'self time'
percentage (5% of the overall time spent rendering) when
benchmarking the rendering of a small cached ERB template that was 3
lines long. It turns out it was from this line. I don't believe the
Set is necessary, either. Removing this line increases the rendering
ips using Benchmark::ips accordingly.
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Before we had a bug in the resolver cache so the disable_cache were not
working when passing options to find
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finder object
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LookupContext is eagerly loaded, and FallbackFileSystemResolver is
referenced at the class level. Just require the resolver from the
eagerly loaded class rather than jumping through autoload hoops
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By default, variants in the templates will be picked up if a variant is set
and there's a match. The format will be:
app/views/projects/show.html.erb
app/views/projects/show.html+tablet.erb
app/views/projects/show.html+phone.erb
If request.variant = :tablet is set, we'll automatically be rendering the
html+tablet template.
In the controller, we can also tailer to the variants with this syntax:
class ProjectsController < ActionController::Base
def show
respond_to do |format|
format.html do |html|
@stars = @project.stars
html.tablet { @notifications = @project.notifications }
html.phone { @chat_heads = @project.chat_heads }
end
format.js
format.atom
end
end
end
The variant itself is nil by default, but can be set in before filters, like
so:
class ApplicationController < ActionController::Base
before_action do
if request.user_agent =~ /iPad/
request.variant = :tablet
end
end
end
This is modeled loosely on custom mime types, but it's specifically not
intended to be used together. If you're going to make a custom mime type,
you don't need a variant. Variants are for variations on a single mime
types.
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CVE-2013-6414
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