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java 10 Parallel Full GC for G1

Java 9 presented G1 (rubbish first) waste collector.The G1 city worker is intended to maintain a strategic distance from full accumulations, however when the simultaneous accumulations can't recover memory quick enough. With this change, a fall back full GC will occur.

The current usage of the full GC for G1 utilizes a solitary strung imprint clear minimized calculation. This change will parallelize the imprint clear smaller calculation and utilize a similar number of strings. It will be activated when simultaneous strings for accumulation can't resuscitate the memory quick enough.

The number of strings can be constrained by the - XX:ParallelGCThreads alternative.

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