[ruby-core:74680] [Ruby trunk Bug#11901] Performance Issue with OpenStruct

Issue #11901 has been updated by Yui NARUSE.

Backport changed from 2.3: REQUIRED to 2.3: DONE

ruby_2_3 r54388 merged revision(s) 53395,53396.

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Bug #11901: Performance Issue with OpenStruct
https://bugs.ruby-lang.org/issues/11901#change-57808

* Author: Ariel Caplan
* Status: Closed
* Priority: Normal
* Assignee: Marc-Andre Lafortune
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin13]
* Backport: 2.3: DONE
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After recent changes to define OpenStruct getter/setter methods lazily, there is a heavy performance impact for the use case where an attribute is assigned at initialization time (i.e. `Openstruct.new(foo: :bar)`).  Once an attribute is stored in the internal hash, the appropriate singleton methods will never be defined, due to the recent changes to OpenStruct's `#respond_to_missing?` - meaning that every time I call `#foo` or `#foo=` it relies on `#method_missing`.  Benchmark using benchmark-ips is attached.

I'm primarily concerned about the case of configuration objects, which may be populated at initialization time and then accessed many times throughout the life of the program.

---Files--------------------------------
openstruct-regression-benchmark.rb (1.36 KB)


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