RFR: 8224112: [TESTBUG] java/util/Base64/TestEncodingDecodingLength.java should be skipped with insufficient memory

[Alan Bateman]

On 18/05/2019 02:17, Jie Fu wrote:
> Hi Alan,
>
> On 2019/5/17 下午11:00, Alan Bateman wrote:
>> The issue isn't clear. The test only runs when on 64-bit systems with 
>> >= 10GB memory. Is the issue related to the -concurrency setting that 
>> you specify to jtreg?
> No. Even we set the concurrency=1, the issue may still occur.
> os.maxMemory >= 10g just check whether the capacity of physical memory 
> is >= 10g, not the available memory to be used.
>
> Our test machine has only 16GB physical memory and is shared by many 
> people in our group.
> The test seems to fail occasionally especially when the test machine 
> is busy.
> I'm trying to find a better solution to this problem.
I'm guessing this must be an embedded system with no swap configured. If 
so then I don't think this is solvable without reserving the machine 
when you need to run tests. This test uses 6-8GB of memory and there are 
several other tests that consume lots of memory too. If several people 
are trying to run tests or do builds at the same time then I assume 
you'll have issues in many areas. I see your patch to have the test skip 
when there isn't 6GB of "free memory" but I assume you'll still have 
intermittent failures when someone else tries to run resource hungry 
tests at around the same time.

-Alan