From: normalperson@...
Date: 2014-09-04T17:12:31+00:00
Subject: [ruby-core:64771] [ruby-trunk - Bug #10202] TestBenchmark#test_realtime_output breaks on ARM

Issue #10202 has been updated by Eric Wong.


 v.ondruch@tiscali.cz wrote:
 > http://paste.fedoraproject.org/130924/14098270/
 
 1144. 22470 clock_gettime(CLOCK_MONOTONIC_RAW, {18856, 134154424}) = 0 <0.000039>
 <snip>
 1152. 22470 clock_gettime(CLOCK_MONOTONIC_RAW, {18857, 135174677}) = 0 <0.000034>
 
 Maybe not, but maybe strace slowed things down enough...
 
 I still think reverting CLOCK_MONONTONIC_RAW changes is the way to
 go, can you confirm?  Thanks.
 
 --- a/lib/benchmark.rb
 +++ b/lib/benchmark.rb
 @@ -272,9 +272,6 @@ module Benchmark
  
    # :stopdoc:
    case
 -  when (defined?(Process::CLOCK_MONOTONIC_RAW) and
 -      (Process.clock_gettime(Process::CLOCK_MONOTONIC_RAW) rescue false))
 -    BENCHMARK_CLOCK = Process::CLOCK_MONOTONIC_RAW
    when defined?(Process::CLOCK_MONOTONIC)
      BENCHMARK_CLOCK = Process::CLOCK_MONOTONIC
    else

----------------------------------------
Bug #10202: TestBenchmark#test_realtime_output breaks on ARM
https://bugs.ruby-lang.org/issues/10202#change-48660

* 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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