Make G1 the Default GC - not a good idea for heavy calculation use cases

[Geoffrey De Smet]

Hi guys,

I've ran some benchmarks on OptaPlanner use cases with the latest OpenJDK 8
to asses the impact of switching the default to G1:
http://www.optaplanner.org/blog/2015/07/31/WhatIsTheFastestGarbageCollectorInJava8.html

Short summary: G1 is consistently worse in every use case for every 
dataset...

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With kind regards,
Geoffrey De Smet