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

[Jon Masamitsu]

Derek,

Fix and test look good.  Those parts are Reviewed.

I don't know whether the TEST.group changes are correct or not.
Someone who understand the rational for inclusion/exclusion should
review those.

Jon


On 4/23/2015 2:55 PM, Derek White wrote:
> 2nd webrev:
>
> Please review this fix for:
> https://bugs.openjdk.java.net/browse/JDK-8076995
> Webrev:
> http://cr.openjdk.java.net/~drwhite/8076995/webrev.01/
>
> Changes:
>
> - Updated TEST.groups to only run this test if G1, CMS, and Parallel 
> GCs are enabled.
> - Also searched for similar GC tests that specify a GC to use and 
> added to TESTS.groups:
>
>   * gc/TestSmallHeap.java
>   * gc/logging/TestGCId.java
>   * gc/TestCardTablePageCommits.java
>   * gc/arguments/TestParallelHeapSizeFlags.java
>
> - Responded to comments below.
>
> Did jprt run. Saw timeout, not sure if real or if it's one of those 
> "embedded tests don't quite fit" errors.
>    Fail/kill comment:  Targets failed.  Target 
> linux_armvfpsflt_2.6-productEmb-c2-hotspot_servertest timedout.
>
>  - Derek
>
> 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)?
>>
>> ForceDynamicNumberOfGCThreads is a diagnostic flag
>>
>>   diagnostic(bool, ForceDynamicNumberOfGCThreads, 
>> false,                    \
>>           "Force dynamic selection of the number of 
>> "                       \
>>           "parallel threads parallel gc will use to aid 
>> debugging")         \
>>
>> so I think you need +UnlockDiagnosticVMOptions.
>>
>> Jon
>>
>> On 04/21/2015 06:53 AM, Derek White wrote:
>>> Hi All,
>>>
>>> Please review this fix for:
>>> https://bugs.openjdk.java.net/browse/JDK-8076995
>>> Webrev:
>>> http://cr.openjdk.java.net/~drwhite/8076995/webrev.00/
>>>
>>> Summary:
>>>
>>> Part 1 is a test bug that tries to run G1 on embedded SE builds. Not changed by this webrev.
>>>
>>> Part two is assertion failure that is being fixed by this webrev.
>>>
>>> This is a fix for bug that triggered an assert when running CMS on very
>>> small machines - 1 core x86, or 1-4 core ARM. This may seem unlikely but
>>>   can easily happen when running virtual instances.
>>>
>>> Failure stack traces also show bug crashing printing a stack trace, but this is being tracked in another bug.
>>>
>>> Thanks,
>>>
>>> - Derek
>>>
>>>
>>>
>>
>

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