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author | Ryuta Kamizono <kamipo@gmail.com> | 2018-02-02 07:52:33 +0900 |
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committer | GitHub <noreply@github.com> | 2018-02-02 07:52:33 +0900 |
commit | 8f2bb58ba2a74975b737f7f7655247b447b7ac08 (patch) | |
tree | dd227ffcfbb88c51077933ea4594f80fe894c70f | |
parent | 2417f3c53f3e5fb1fbc1f8ba3a75ce65349dc11c (diff) | |
download | rails-8f2bb58ba2a74975b737f7f7655247b447b7ac08.tar.gz rails-8f2bb58ba2a74975b737f7f7655247b447b7ac08.tar.bz2 rails-8f2bb58ba2a74975b737f7f7655247b447b7ac08.zip |
PERF: Recover marshaling dump/load performance (#31827)
* PERF: Recover marshaling dump/load performance
This performance regression which is described in #30680 was caused by
f0ddf87 due to force materialized `LazyAttributeHash`.
Since 95b86e5, default proc has been removed in the class, so it is no
longer needed that force materialized.
Avoiding force materialized will recover marshaling dump/load
performance.
Benchmark:
https://gist.github.com/blimmer/1360ea51cd3147bae8aeb7c6d09bff17
Before:
```
it took 0.6248569069430232 seconds to unmarshal the objects
Total allocated: 38681544 bytes (530060 objects)
allocated memory by class
-----------------------------------
12138848 Hash
10542384 String
7920000 ActiveModel::Attribute::Uninitialized
5600000 ActiveModel::Attribute::FromDatabase
1200000 Foo
880000 ActiveModel::LazyAttributeHash
400000 ActiveModel::AttributeSet
80 Integer
72 ActiveRecord::ConnectionAdapters::SQLite3Adapter::SQLite3Integer
40 ActiveModel::Type::String
40 ActiveRecord::Type::DateTime
40 Object
40 Range
allocated objects by class
-----------------------------------
250052 String
110000 ActiveModel::Attribute::Uninitialized
70001 Hash
70000 ActiveModel::Attribute::FromDatabase
10000 ActiveModel::AttributeSet
10000 ActiveModel::LazyAttributeHash
10000 Foo
2 Integer
1 ActiveModel::Type::String
1 ActiveRecord::ConnectionAdapters::SQLite3Adapter::SQLite3Integer
1 ActiveRecord::Type::DateTime
1 Object
1 Range
```
After:
```
it took 0.1660824950085953 seconds to unmarshal the objects
Total allocated: 13883811 bytes (220090 objects)
allocated memory by class
-----------------------------------
5743371 String
4940008 Hash
1200000 Foo
880000 ActiveModel::LazyAttributeHash
720000 Array
400000 ActiveModel::AttributeSet
80 ActiveModel::Attribute::FromDatabase
80 Integer
72 ActiveRecord::ConnectionAdapters::SQLite3Adapter::SQLite3Integer
40 ActiveModel::Type::String
40 ActiveModel::Type::Value
40 ActiveRecord::Type::DateTime
40 Object
40 Range
allocated objects by class
-----------------------------------
130077 String
50004 Hash
10000 ActiveModel::AttributeSet
10000 ActiveModel::LazyAttributeHash
10000 Array
10000 Foo
2 Integer
1 ActiveModel::Attribute::FromDatabase
1 ActiveModel::Type::String
1 ActiveModel::Type::Value
1 ActiveRecord::ConnectionAdapters::SQLite3Adapter::SQLite3Integer
1 ActiveRecord::Type::DateTime
1 Object
1 Range
```
Fixes #30680.
* Keep the `@delegate_hash` to avoid to lose any mutations that have been made to the record
-rw-r--r-- | activemodel/lib/active_model/attribute_set/builder.rb | 20 | ||||
-rw-r--r-- | activemodel/test/cases/attribute_set_test.rb | 16 |
2 files changed, 27 insertions, 9 deletions
diff --git a/activemodel/lib/active_model/attribute_set/builder.rb b/activemodel/lib/active_model/attribute_set/builder.rb index 758eb830fc..bf2d06b48a 100644 --- a/activemodel/lib/active_model/attribute_set/builder.rb +++ b/activemodel/lib/active_model/attribute_set/builder.rb @@ -22,12 +22,12 @@ module ActiveModel class LazyAttributeHash # :nodoc: delegate :transform_values, :each_key, :each_value, :fetch, :except, to: :materialize - def initialize(types, values, additional_types, default_attributes) + def initialize(types, values, additional_types, default_attributes, delegate_hash = {}) @types = types @values = values @additional_types = additional_types @materialized = false - @delegate_hash = {} + @delegate_hash = delegate_hash @default_attributes = default_attributes end @@ -76,15 +76,17 @@ module ActiveModel end def marshal_dump - materialize + [@types, @values, @additional_types, @default_attributes, @delegate_hash] end - def marshal_load(delegate_hash) - @delegate_hash = delegate_hash - @types = {} - @values = {} - @additional_types = {} - @materialized = true + def marshal_load(values) + if values.is_a?(Hash) + empty_hash = {}.freeze + initialize(empty_hash, empty_hash, empty_hash, empty_hash, values) + @materialized = true + else + initialize(*values) + end end protected diff --git a/activemodel/test/cases/attribute_set_test.rb b/activemodel/test/cases/attribute_set_test.rb index 9b323dae9d..b868dba743 100644 --- a/activemodel/test/cases/attribute_set_test.rb +++ b/activemodel/test/cases/attribute_set_test.rb @@ -217,6 +217,22 @@ module ActiveModel assert_equal({ foo: "1" }, attributes.to_hash) end + test "marshaling dump/load legacy materialized attribute hash" do + builder = AttributeSet::Builder.new(foo: Type::String.new) + attributes = builder.build_from_database(foo: "1") + + attributes.instance_variable_get(:@attributes).instance_eval do + class << self + def marshal_dump + materialize + end + end + end + + attributes = Marshal.load(Marshal.dump(attributes)) + assert_equal({ foo: "1" }, attributes.to_hash) + end + test "#accessed_attributes returns only attributes which have been read" do builder = AttributeSet::Builder.new(foo: Type::Value.new, bar: Type::Value.new) attributes = builder.build_from_database(foo: "1", bar: "2") |