RFR: 8236106: [TESTBUG] Shenandoah: Make TestThreadFailure more resilient

[Roman Kennke]

I'll also backport it to sh/jdk11 right away, because that's where I 
need it most. Ok?

Roman

> Good.
> 
> Thanks,
> 
> -Zhengyu
> 
> On 12/17/19 11:31 AM, Roman Kennke wrote:
>> Currently, we see frequent timeouts with TestThreadFailure. On my 
>> local machine, this test standalone can run 1:30, on CI box it can 
>> exceed the 8minutes limit. Problem seems to be that it's running into 
>> back-to-back-GCs but not into OOM fast enough.
>>
>> Decreasing the max heapsize of the launched process seems to complete 
>> much faster (in under 2 minutes on the CI box) and thus more resilient.
>>
>> http://cr.openjdk.java.net/~rkennke/JDK-8236106/webrev.00/
>>
>> Testing: hotspot_gc_shenandoah, several runs of the test standalone
>>
>> Ok?
>>
>