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

[Tim Bell]

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