RFR: JDK-8166648,,jib make run-test for langtools results in intermittent failures on windows-x86

[Jonathan Gibbons]

Tim,

The problem only appears on 32-bit Windows, but the fix appears to be 
across the board.
Does this penalize or otherwise adversely affect test runs on other 
platforms?

-- Jon

On 10/07/2016 07:15 AM, Tim Bell wrote:
> Again with the review link .. see below:
>
> On 10/07/16 06:40, Tim Bell wrote:
>> Hello
>>
>> The change of HotSpot runtimes on 32-bit Windows [1] has been a source
>> of langtools test failures due to memory space exhaustion.
>>
>> On our Windows build/test clients, the combination of the C2 runtime and
>> parallel GC causes about 20 extra threads to be started in each VM.
>> These added thread stacks, plus heap management in C2, result in too
>> much memory pressure to fit the workload into 32-bit VMs.
>>
>> This fix will run langtools jtreg tests using the serial garbage
>> collector instead of using the default collector (parallel GC).
>
> http://cr.openjdk.java.net/~tbell/8166648/
>
>>
>> Testing:
>>    -5 out of 5 jobs (with the fix) passed langtools testing
>>    -4 out of 5 control jobs (without the fix) failed testing in
>> windows_i586_6.3-product-c2-langtools_jtreg
>>
>>
>> Thanks in advance-
>>
>> Tim
>>
>> [1] JDK-8154209 "Remove client VM from default JIB profile on
>> windows-x86 and linux-x86"
>> https://bugs.openjdk.java.net/browse/JDK-8154209
>