[ruby-core:64755] [ruby-trunk - Bug #10202] TestBenchmark#test_realtime_output breaks on ARM

Issue #10202 has been updated by Vit Ondruch.


>  The real bug might be a timer firing too soon.
>  
>  Can you show us the output of: strace -Tvf ruby -e 'sleep 1'
>  
>  I mainly care about the timing of FUTEX_WAIT_BITSET(_PRIVATE) and poll
>  syscalls.  Thank you.

http://paste.fedoraproject.org/130884/81461414/


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Bug #10202: TestBenchmark#test_realtime_output breaks on ARM
https://bugs.ruby-lang.org/issues/10202#change-48644

* Author: Vit Ondruch
* Status: Open
* Priority: Normal
* Assignee: Akira Tanaka
* Category: 
* Target version: 
* ruby -v: ruby 2.2.0dev (2014-09-03 trunk 47372) [armv7hl-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
I observe following error on ARM:

~~~
  3) Failure:
TestBenchmark#test_realtime_output [/builddir/build/BUILD/ruby-2.2.0-r47372/test/benchmark/test_benchmark.rb:159]:
Expected 1.0 to be < 0.999977873172611.
~~~

It seems to be introduced by r47360. Reverting the commit makes test suite to pass once again.



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