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Feature #10201

closed

Dynamically changing GC tuning parameters

Added by ko1 (Koichi Sasada) about 7 years ago. Updated about 7 years ago.

Status:
Rejected
Priority:
Normal
Target version:
[ruby-core:64743]

Description

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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