From: ko1@...
Date: 2014-12-12T09:39:57+00:00
Subject: [ruby-core:66805] [ruby-trunk - Feature #10585] struct: speedup struct.attr = v for first 10 attributes and struct[:attr] for big structs

Issue #10585 has been updated by Koichi Sasada.


I don't have any idea about these patch.
In fact, I like 0001.

So just comments and questions for curious.

> I was really disappointed when I discovered that struct.name= v
> is much slower than object.name= v when name defined with attr_accessor.

How about to implement Struct as attr_setter?

----

Another question is "how many people use Struct?".
Do you know? Any trouble on performance of Struct?

Ruby has Hash object and Class's attribute. Most of people using them.
Only I know is the book "understanding computation" :)


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Feature #10585: struct: speedup struct.attr = v for first 10 attributes and struct[:attr] for big structs
https://bugs.ruby-lang.org/issues/10585#change-50378

* Author: Yura Sokolov
* Status: Open
* Priority: Normal
* Assignee: 
* Category: core
* Target version: current: 2.2.0
----------------------------------------
0001 - Define optimized setters for first 10 attributes.

0002 - Cache members definition in an subclasses - it is safe cause it could be modified/overloaded.
And use `rb_attr_get` to lookup definition - it is safe cause result is checked later and `Qnil` is treated as error.

0003,0004 - Use custom hash structure (on top of Array) to lookup members index in a big structure.
Well, I doubt that big structures are useful, so I will not grieve if 0004 is not accepted.

---Files--------------------------------
0001-struct.c-speedup-struct.name-v-for-small-structs.patch (2.33 KB)
0002-struct.c-cache-member-definition-in-a-subclass.patch (1.09 KB)
0003-benchmark-struct-name.patch (2.42 KB)
0004-struct.c-speedup-for-big-structs.patch (5.47 KB)


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