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

[Tim Bell]

Hi Jon

On 10/07/16 15:48, Jonathan Gibbons wrote:
> 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?

Good point.  Here is an updated webrev where serialGC is requested only 
on 32 bit platforms:

    http://cr.openjdk.java.net/~tbell/8166648/webrev.01/

This change tested OK in JPRT on the following platforms:
   solaris_sparcv9_5.11-product-c2-langtools_jtreg
   solaris_x64_5.11-product-c2-langtools_jtreg
   linux_i586_3.8-product-c2-langtools_jtreg
   linux_x64_3.8-product-c2-langtools_jtreg
   macosx_x64_10.9-product-c2-langtools_jtreg
   windows_i586_6.3-product-c2-langtools_jtreg
   windows_x64_6.3-product-c2-langtools_jtreg

I inspected the test logs to verify -XX:+UseSerialGC is passed only 
during 32-bit testing.

Tim

>
> -- 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
>>
>