RFR (S): 8076995: gc/ergonomics/TestDynamicNumberOfGCThreads.java failed with java.lang.RuntimeException: 'new_active_workers' missing from stdout/stderr

Derek White derek.white at oracle.com
Wed Apr 22 16:30:35 UTC 2015

On 4/22/15 11:34 AM, Jon Masamitsu wrote:
> On 4/21/2015 1:56 PM, Derek White wrote:
>> Thanks  Jon!
>> On 4/21/15 1:23 PM, Jon Masamitsu wrote:
>>> Derek,
>>> Thanks for fixing this.
>>> Fix looks good.
>>> What do you think about always making testDynamicNumberOfGCThread()
>>> check for the uniprocessor case (as opposed to passing in a flag to 
>>> explicitly
>>> check it)?
>> This may not catch all of the failures. What I couldn't pin down was 
>> why some 2, 3(!), or 4 core ARM machines would result in defaulting 
>> ParallelGCThreads=1. Now these were embedded machines, with 
>> potentially "odd" versions of linux, possibly with "odd" errata. Or 
>> perhaps there was some dynamic differences between "installed" and 
>> "on-line" cores.
>> In any case the safest test seemed to be to force ParallelGCThreads=1 
>> and see if it works.
> I don't think I said it right.  What I meant was that 
> testDynamicNumberOfGCThread()
> should always test both cases (emulate_uniprocessor true and false) 
> instead of calling
> testDynamicNumberOfGCThread() twice, once with emulate_uniprocessor 
> true and once
> with emulate_uniprocessor false.  Was that what you responded to?

Ah, OK. Thanks!

  - Derek

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