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benchmark/bm_vm_thread_pass_flood.rb: add comment

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I was about to write off this benchmark while working on GVL
improvements on multi-core systems.

However I noticed it exposes a weakness in my work-in-progress
code when I tested on an old single CPU system.  Further testing
reveals setting CPU affinity ("schedtool -a 0x1" on Linux) on a
modern multi-core system is enough to reproduce the problem
exposed by this benchmark.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58571 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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normal 2017-05-04 16:47:17 +00:00
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benchmark/bm_vm_thread_pass_flood.rb
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@ -1,3 +1,5 @@
# n.b. this is a good test for GVL when pinned to a single CPU
1000.times{
Thread.new{loop{Thread.pass}}
}