JEP 248: Make G1 the Default Garbage Collector

Andrew Dinn adinn at
Thu Jul 30 16:50:55 UTC 2015

On 30/07/15 16:42, charlie hunt wrote:
> While we really like hearing about experiences with G1 GC, (and the
> other collectors as well), let’s try to keep the discussion on this
> thread on the subject G1 GC being made the default GC for JDK 9 by
> talking about the scenarios and the observations of those potentially
> impacted.

I think you miss my point which was not to share my experiences. Rather
it was to rebut your suggestion that G1 is an inherently better GC than
Parallel on the grounds of its heap usage by pointing out that the
superiority of G1 in this regard is more apparent than real. I would
hate to see us to fix whatever real problem we face by switching to a
different default GC if it might be much better solved by adjusting the
configuration of the existing GC.


Andrew Dinn
Senior Principal Software Engineer
Red Hat UK Ltd
Registered in UK and Wales under Company Registration No. 3798903
Directors: Michael Cunningham (USA), Matt Parson (USA), Charlie Peters
(USA), Michael O'Neill (Ireland)

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