RFR (S) 8230052: MLVM findDeadlock test timed out

[Coleen Phillimore]

I've looked at the core file some more in the Serviceability Agent and 
honestly have no idea if this logging would be helpful, but seeing the 
interaction between GC and the safepoint to FindDeadlocks might be 
useful.  So I'll push this change for now.  I'm sure this bug will be 
back and somebody's going to have to figure out how to test this without 
ambiguous timeouts.

Coleen

On 8/28/20 9:55 PM, David Holmes wrote:
> On 29/08/2020 5:18 am, Coleen Phillimore wrote:
>>
>> Continuing the discussion in the bug, I've taken out the System.gc() 
>> and added -Xlog:gc+safepoint to see if these give any ideas why the 
>> test times out. See:
>
> So no longer trying to fix it just trying to get more diagnostics. But 
> how much logging info is that going to produce? Are we just going to 
> hit the jtreg buffer limit?
>
> I would have gone for some coarser higher-level "logging" initially. 
> It is going to be hard to correlate the log entries with what is 
> happening at the test level without output from the test itself that 
> will appear in-order with the system logging. So I'm not at all sure 
> this logging will really help.
>
> But lets give it a try.
>
> David
>
>> bug link https://bugs.openjdk.java.net/browse/JDK-8230052
>> open webrev at 
>> http://cr.openjdk.java.net/~coleenp/2020/8230052.02/webrev
>>
>> thanks,
>> Coleen
>>
>>
>> On 8/28/20 8:22 AM, Patricio Chilano wrote:
>>> Hi Coleen,
>>>
>>> On 8/27/20 7:53 PM, Coleen Phillimore wrote:
>>>> Summary: Add a System.gc() and reduce iteration count for more 
>>>> stability.
>>>>
>>>> open webrev at 
>>>> http://cr.openjdk.java.net/~coleenp/2020/8230052.01/webrev
>>>> bug link https://bugs.openjdk.java.net/browse/JDK-8230052
>>> Looks good to me.
>>> If we see any new failure I think we can try to run the test with 
>>> extra VM logging enabled.
>>>
>>>
>>> Thanks,
>>> Patricio
>>>> Ran test 100x with < 1minute run time. Should I add a timeout of 10 
>>>> minutes also?
>>>>
>>>> Thanks,
>>>> Coleen
>>>
>>