RFR(S): 8166738 - Enable concurrency in Hotspot jtreg testing

[George Triantafillou]

Christian,

Your changes look good!

-George

On 9/26/2016 5:07 PM, Christian Tornqvist wrote:
> Hi everyone,
>
>   
>
> Please review this small change that enables concurrency for the Hotspot
> jtreg tests when running them through the make system. Testing done so far
> shows very promising speed ups, both when running locally and in JPRT.
>
>   
>
> It'll automatically calculate a sane concurrency number based on the number
> of cores / 2 (with a maximum of 12) and then sets
> MaxRAMFraction=concurrency*4 to make sure we don't run out of memory. The
> concurrency value can be overridden by setting TEST_JOBS to the desired
> concurrency value.
>
>   
>
> On Windows, this change is temporarily commented out since we run into the
> intermittent issue described in JDK-8159799.
>
>   
>
> Webrev:
>
> http://cr.openjdk.java.net/~ctornqvi/webrev/8166738/webrev.00/
>
>   
>
> Bug:
>
> https://bugs.openjdk.java.net/browse/JDK-8166738
>
>   
>
> Thanks,
>
> Christian
>