From: SASADA Koichi <ko1@...>
Date: 2011-06-10T10:35:09+09:00
Subject: [ruby-core:36908] Re: [Ruby 1.9 - Feature #3905] rb_clear_cache_by_class() called often during GC for non-blocking I/O

Hi,

(2011/06/07 2:55), Eric Wong wrote:
> Akira Tanaka <akr@fsij.org> wrote:
>> I don't against for the ephemeral class flag but
>> it needs discussion with ko1 and/or matz.
> 
> Can either of them comment please?  I would really like to see
> this performance regression fixed in 1.9.3.

Clearing method caching cause the following 2 overheads:

(1) Clearing overhead
(2) Cache misses because of clearing methods

Which is your purpose?

For (1), I made an alternative patch:
  http://www.atdot.net/sp/readonly/x8wjml

For (2), ephemeral class seems good.

-- 
// SASADA Koichi at atdot dot net