[ruby-core:63312] [ruby-trunk - Feature #9963] Symbol.count

Issue #9963 has been updated by Motohiro KOSAKI.


I understand symbol table detection is important for tuning ruby nowadays. But as far as I know, it is just because past ruby can't gc symbols.

Now, ruby trunk has symbol GC. (https://bugs.ruby-lang.org/issues/9634).
So, symbol table size is no longer important tuning parameter.

If you have another use case, please elaborate more detail. 

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Feature #9963: Symbol.count
https://bugs.ruby-lang.org/issues/9963#change-47362

* Author: David Cornu
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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I'd like to add a way to get the size of Ruby's symbol table. This is currently possible by using `Symbol.all_symbols`, however it builds a new array every time it's invoked which is pretty inefficient.

The main use case for this would be to assist in detecting accidental symbol creation.

I have a PR open (https://github.com/ruby/ruby/pull/639) that adds a `Symbol.count` method but this could also be added in the output of `GC.stat`.



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