From: ko1@...
Date: 2014-09-03T09:39:15+00:00
Subject: [ruby-core:64743] [ruby-trunk - Feature #10201] [Open] Dynamically changing GC tuning parameters

Issue #10201 has been reported by Koichi Sasada.

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Feature #10201: Dynamically changing GC tuning parameters
https://bugs.ruby-lang.org/issues/10201

* Author: Koichi Sasada
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
* Category: core
* Target version: current: 2.2.0
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Now, MRI has several GC tuning parameters to modify GC behavior given by environment variables. However, these parameters can not be changed after launched.

We can change these parameter in runtime.
For example, mruby provides some methods to change incremental GC behavior.

* GC.interval_ratio (getter)
* GC.interval_ratio= (setter)
* GC.step_ratio (getter)
* GC.step_ratio= (setter)

I propose to add method (methods) to change such GC parameters dynamically.

One idea is:

* GC.parameters           #=> return a hash value 
* GC.parameters(foo: xxx) #=> set GC parameter foo to xxx
* GC.parameters(foo: nil) #=> reset (to default value) GC parameter foo

Note that this API should be MRI implementation dependent.
For Environment variables, implementations can simply ignore them.
However, a ruby script using these methods can run only on supporting implementation.
So it can be compatibility issue.





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