[ruby-core:64751] [ruby-trunk - Bug #10202] TestBenchmark#test_realtime_output breaks on ARM

Issue #10202 has been updated by Eric Wong.


 [e-mail] wrote:
 > 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.
 
 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.
 
 > It seems to be introduced by r47360. Reverting the commit makes test
 > suite to pass once again.
 
 Reverting just the change to lib/benchmark.rb?  Or reverting the test
 case, too?

----------------------------------------
Bug #10202: TestBenchmark#test_realtime_output breaks on ARM
https://bugs.ruby-lang.org/issues/10202#change-48641

* 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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