[ruby-core:50990] [ruby-trunk - Feature #4614] [RFC/PATCH] thread_pthread.c: lower RUBY_STACK_MIN_LIMIT to 64K

Issue #4614 has been updated by ko1 (Koichi Sasada).

Priority changed from High to Normal

I add environment variable at r38479.

	    - RUBY_THREAD_VM_STACK_SIZE: vm stack size used at thread creation.
	      default: 128KB (32bit CPU) or 256KB (64bit CPU).
	    - RUBY_THREAD_MACHINE_STACK_SIZE: machine stack size used at thread
	      creation. default: 512KB or 1024KB.
	    - RUBY_FIBER_VM_STACK_SIZE: vm stack size used at fiber creation.
	      default: 64KB or 128KB.
	    - RUBY_FIBER_MACHINE_STACK_SIZE: machine stack size used at fiber
	      creation. default: 256KB or 256KB.

I want to ask feedback about this default setting.


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Feature #4614: [RFC/PATCH] thread_pthread.c: lower RUBY_STACK_MIN_LIMIT to 64K
https://bugs.ruby-lang.org/issues/4614#change-34870

Author: normalperson (Eric Wong)
Status: Feedback
Priority: Normal
Assignee: ko1 (Koichi Sasada)
Category: core
Target version: 2.0.0


=begin
The patch (committed) for Issue #4568 made this change possible.

Lowering stack size allows users on memory-constrained 32-bit
machines to spawn more native threads (which are easier (IMHO)
to use than Fibers).

Setting RUBY_STACK_MIN_LIMIT to 48K seems to work even with
check, test-rubyspec, and benchmark-each targets.  However, I'm
keeping it at 64K since that is what Symbian uses, so maybe
there's some code paths that need 64K.

I started experiencing failures with the Ruby tests with 44K on
x86_64, so 44K is definitely not safe.  Much more effort would
be required to make Ruby work with smaller stacks than 48K.

Also pullable via git: git pull git://bogomips.org/ruby.git stack-reduce

=end



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