Issue #16837 has been updated by shyouhei (Shyouhei Urabe).


If you recompile everything using `./configure cppflags=-DNDEBUG`, then those assertions are eliminated, to let compilers inline `rb_array_len` again.

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Feature #16837: Can we make Ruby 3.0 as fast as Ruby 2.7 with the new assertions?
https://bugs.ruby-lang.org/issues/16837#change-85424

* Author: k0kubun (Takashi Kokubun)
* Status: Open
* Priority: Normal
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## Problem
How can we make Ruby 3.0 as fast as (or faster than) Ruby 2.7?

### Background
* Split ruby.h https://github.com/ruby/ruby/pull/2991 added some new assertions
* While it has been helpful for revealing various bugs, it also made some Ruby programs notably slow, especially Optcarrot https://benchmark-driver.github.io/benchmarks/optcarrot/commits.html

## Possible approaches
I have no strong preference yet. Here are some random ideas:

* Optimize the assertion code somehow
* Enable the new assertions only on CIs, at least ones in hot spots
  * Not sure which places have large impact on Optcarrot yet
* Make some other not-so-important assertions CI-only to offset the impact from new ones
* Provide .so for an assertion-enabled mode? (ko1's idea)

I hope people will comment more ideas in this ticket.



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