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

Christian Tornqvist christian.tornqvist at oracle.com
Mon Sep 26 21:07:11 UTC 2016

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. 










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