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* Fix a few typos
* Remove reference to the old `memcache-client` gem
* Remove the "ActiveSupport::Cache::EhCacheStore" part from the guide as
the gem doesn't seem to be maintained anymore.
* Move the "Custom Cache Stores" part under the "AS::Cache::Store" part
as they are pretty related.
[ci skip]
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Inform user to add styles in correct location in application.css
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Before this patch, using `bin/rails test` with a non existing
file or directory argument would silently swallow the argument and
run the whole test suite.
After the patch the command fails with `cannot load such file --`.
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Add missing assertion for test_route_with_colon_first
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Update Time#advance documentation with examples [ci skip]
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Fix ambiguous argument warning
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encapsulate all arguments
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Use #start_with? and #[] for speed
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While the readability may be slightly worse, the speed improvement is
significant: Twice as fast when there's no leading "/" to remove, and
over 4 times as fast when there is a leading "/".
Benchmark:
require 'benchmark/ips'
def match(controller)
if controller
if m = controller.match(/\A\/(?<controller_without_leading_slash>.*)/)
m[:controller_without_leading_slash]
else
controller
end
end
end
def start_with(controller)
if controller
if controller.start_with?('/'.freeze)
controller[1..-1]
else
controller
end
end
end
Benchmark.ips do |x|
x.report("match") { match("no_leading_slash") }
x.report("start_with") { start_with("no_leading_slash") }
x.compare!
end
Benchmark.ips do |x|
x.report("match") { match("/a_leading_slash") }
x.report("start_with") { start_with("/a_leading_slash") }
x.compare!
end
Result (Ruby 2.2.2):
Calculating -------------------------------------
match 70.324k i/100ms
start_with 111.264k i/100ms
-------------------------------------------------
match 1.468M (± 7.1%) i/s - 7.314M
start_with 3.787M (± 3.5%) i/s - 18.915M
Comparison:
start_with: 3787389.4 i/s
match: 1467636.4 i/s - 2.58x slower
Calculating -------------------------------------
match 36.694k i/100ms
start_with 86.071k i/100ms
-------------------------------------------------
match 532.795k (± 4.7%) i/s - 2.679M
start_with 2.518M (± 5.8%) i/s - 12.566M
Comparison:
start_with: 2518366.8 i/s
match: 532794.5 i/s - 4.73x slower
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Save a string allocation inside loop
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In the `tag_options` method, strings are continuously added to the
`output` string. Previously, we concatenated two strings and added the
generated string to `output`. By adding each of the strings to
`output`, one after the other, we will save the allocation of that
concatenated string.
Benchmark:
require 'benchmark/ips'
sep = " ".freeze
Benchmark.ips do |x|
x.report("string +") {
output = ""
output << sep + "foo"
}
x.report("string <<") {
output = ""
output << sep
output << "foo"
}
x.compare!
end
Results (Ruby 2.2.2):
Calculating -------------------------------------
string + 88.086k i/100ms
string << 94.287k i/100ms
-------------------------------------------------
string + 2.407M (± 5.8%) i/s - 12.068M
string << 2.591M (± 7.0%) i/s - 12.917M
Comparison:
string <<: 2591482.4 i/s
string +: 2406883.7 i/s - 1.08x slower
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correct example of button_tag [ci skip]
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wrapper div has been removed in cbb917455f306cf5818644b162f22be09f77d4b2
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PostgreSQL is strict about the usage of `DISTINCT` and `ORDER BY`, which
one of the tests demonstrated. The order clause is never going to be
relevant in the query we're performing, so let's just remove it
entirely.
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Add #cache_key to ActiveRecord::Relation.
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[ci skip]
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Add descriptions about `ActiveRecord::Base#to_param` to
* `ActionDispatch::Routing::Base#match`
* Overriding Named Route Parameters (guide)
When passes `:param` to route definision, always `to_param` method of
related model is overridden to constructe an URL by passing these
model instance to named_helper.
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This is a follow up to #21008.
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Add documentation to get a running custom base controller [ci skip]
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Fix WARNINGS flag inside guides/Rakefile
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Don't fail when checking dependencies in bin/setup script
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Array#any? is slower and not the inverse of Array#empty?
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```
empty_array = []
small_array = [1] * 30
bigger_array = [1] * 300
Benchmark.ips do |x|
x.report('empty !empty?') { !empty_array.empty? }
x.report('small !empty?') { !small_array.empty? }
x.report('bigger !empty?') { !bigger_array.empty? }
x.report('empty any?') { empty_array.any? }
x.report('small any?') { small_array.any? }
x.report('bigger any?') { bigger_array.any? }
end
```
```
Calculating -------------------------------------
empty !empty? 132.059k i/100ms
small !empty? 133.974k i/100ms
bigger !empty? 133.848k i/100ms
empty any? 106.924k i/100ms
small any? 85.525k i/100ms
bigger any? 86.663k i/100ms
-------------------------------------------------
empty !empty? 8.522M (± 7.9%) i/s - 42.391M
small !empty? 8.501M (± 8.5%) i/s - 42.202M
bigger !empty? 8.434M (± 8.6%) i/s - 41.894M
empty any? 4.161M (± 8.3%) i/s - 20.743M
small any? 2.654M (± 5.2%) i/s - 13.256M
bigger any? 2.642M (± 6.4%) i/s - 13.173M
```
Ref: https://github.com/rails/rails/pull/21057#discussion_r35902468
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Beyond Ludicrous Speed
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It is slightly faster:
```
Calculating -------------------------------------
each; delete 35.166k i/100ms
delete_if 36.416k i/100ms
-------------------------------------------------
each; delete 478.026k (± 8.5%) i/s - 2.391M
delete_if 485.123k (± 7.9%) i/s - 2.440M
```
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We don't always need an array when generating a url with the formatter. We can be lazy about allocating the `missing_keys` array. This saves us:
35,606 bytes and 889 objects per request
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THe only reason we were allocating an array is to get the "missing_keys" variable in scope of the error message generator. Guess what? Arrays kinda take up a lot of memory, so by replacing that with a nil, we save:
35,303 bytes and 886 objects per request
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In the `tag_options` method an array is used to build up elements, then `Array#*` (which is an alias for `Array#join` is called to turn the array into a string. Instead of allocating an array to build a string, we can build the string we want from the beginning.
Saved: 121,743 bytes 893 objects
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We can save a few objects by freezing the `replacement` string. We save a few more by down-casing the string in memory instead of allocating a new one. We save far more objects by checking for the default separator `"-"`, and using pre-generated regular expressions.
We will save 209,231 bytes and 1,322 objects.
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If we don't mutate the `recall` hash, then there's no reason to duplicate it. While this change doesn't get rid of that many objects, each hash object it gets rid of was massive.
Saves 888 string objects per request, 206,013 bytes (thats 0.2 mb which is kinda a lot).
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Instead of calling `sub` on every link_to call for controller, we can detect when the string __needs__ to be allocated and only then create a new string (without the leading slash), otherwise, use the string that is given to us.
Saves 888 string objects per request, 35,524 bytes.
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Saves 888 string objects per request.
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When `defaults[key]` in `generate` in the journey formatter is called, it often returns a `nil` when we call `to_s` on a nil, it allocates an empty string. We can skip this check when the default value is nil.
This change buys us 35,431 bytes of memory and 887 fewer objects per request.
Thanks to @matthewd for help with the readability
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content_tag's first argument is will generate a string with an html tag so `:a` will generate: `<a></a>`. When this happens, the symbol is implicitly `to_s`-d so a new string is allocated. We can get around that by using a frozen string instead which
This change buys us 74,236 bytes of memory and 1,855 fewer objects per request.
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The instrument method creates new strings, the most common action to instrument is "!render_template` so we can detect when that action is occurring and use a frozen string instead.
This change buys us 113,714 bytes of memory and 1,790 fewer objects per request.
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No idea why on earth this hash key isn't already optimized by MRI, but it isn't. :shit:
This change buys us 74,077 bytes of memory and 1,852 fewer objects per request.
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