G1 parallel old gen collection

[Christian Thalinger]

First, I apologize if I get all the terminology wrong.  You know me… this is all a blackbox to me.

I’m currently trying to run some Twitter services with G1 and the results are encouraging but not good enough.  One issue is that full GCs take much longer than with ParallelOld (3-4x longer).

Tony said that G1’s old collection is not parallel.

Is that still the case in JDK 9?  If yes, is someone at Oracle working on parallelizing it?