JEP 248: Make G1 the Default Garbage Collector

Martijn Verburg martijnverburg at gmail.com
Fri Jun 5 08:54:19 UTC 2015


+1 from me - when the proposed change lands we'll reach out to our
customers and get them to try it.

Cheers,
Martijn

On 5 June 2015 at 09:39, Kirk Pepperdine <kirk at kodewerk.com> wrote:

> Hi Charlie,
>
> An excellent summary. I like Mark’s suggestion that there be a path to
> roll back should we discover something before GA.
>
> Regards,
> Kirk
>
> BTW, I’ve reconfigured everything I use to use G1
>
>
> On Jun 5, 2015, at 12:08 AM, mark.reinhold at oracle.com wrote:
>
> > 2015/6/4 6:44 -0700, charlie.hunt at oracle.com:
> >> Wanted to come back to this thread, continue the dialog, reiterate the
> >> objective, (try to) summarize the concerns and put forth a potential
> >> plan for this JEP going forward.
> >>
> >> Intent: Use G1 GC as the default collector chosen by the JVM when no
> >> GC is explicitly set at the JVM command line.
> >>
> >> ...
> >
> > Charlie -- thanks for the excellent summary of this wide-ranging
> > discussion!
> >
> >> ...
> >>
> >> Suggested plan for moving forward:
> >> - Make G1 the default collector in JDK 9, continue to evaluate G1 and
> >>  enhance G1 in JDK 9
> >> - Mitigate risk by reverting back to Parallel GC before JDK 9 goes
> >>  “Generally Available” (Sept 22, 2016 [1]) if warranted by continuing
> >>  to monitor observations and experiences with G1 in both JDK 9
> >>  pre-releases and latest JDK 8 update releases
> >> - Address enhancing ergonomics for selecting a default GC as a
> >>  separate JEP if future observations suggests its needed
> >
> > I think this is a fine plan.
> >
> > Stefan -- To move forward with JEP 248, could you please revise the
> > second item in the "Risks and Assumptions" section to note that there
> > is some concern that G1 might not be ready to become the default, that
> > making it the default now will allow us to get more feedback on it, and
> > that if it proves to be not ready then we'll revert the default to the
> > Parallel GC in time for JDK 9 GA?
> >
> > Ben -- Can you live with this plan?
> >
> > - Mark
>
>
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