JEP 189: Shenandoah: An Ultra-Low-Pause-Time Garbage Collector

[Vitaly Davidovich]

I think the issues with G1 were more implementation bugs; that is, some
code had a bug that was hidden/uncaught on stronger memory models.  I don't
think there's anything in G1's design that's an issue.  At least that's
what I understood by looking at CRs coming from Volker/Goetz.

Sent from my phone
On Jan 17, 2014 5:01 PM, "Christine Flood" <chf at redhat.com> wrote:

> I stopped working on GC after the G1 paper was published.
> Can you elaborate on the issues you have with G1 on PowerPC machines?
>
> Our algorithm should work if you have a dependable CAS instruction.
>
> I will ask about access to a PowerPC machine.
>
> Christine
>
> ----- Original Message -----
> > From: "Volker Simonis" <volker.simonis at gmail.com>
> > To: "Roman Kennke" <rkennke at redhat.com>, chf at redhat.com
> > Cc: "Hotspot-Gc-Dev" <hotspot-gc-dev at openjdk.java.net>
> > Sent: Friday, January 17, 2014 4:09:40 PM
> > Subject: Re: JEP 189: Shenandoah: An Ultra-Low-Pause-Time Garbage
> Collector
> >
> > Hi Roman, Christine,
> >
> > I'm really looking forward to hear your talk about Shenandoah on FOSDEM.
> >
> > But now that you already asked for questions:
> >
> > Will you design the new collector with weak memory model architectures
> > in mind. I know that it is hard if you don't have the corresponding
> > hardware but I think RedHat should at least have access to some decent
> > PowerPC machines and I would strongly advise you to test there
> > thoroughly from the very beginning. We had (and still have) a lot of
> > problems with G1 on these architectures.
> >
> > Regards,
> > Volker
> >
> > On Fri, Jan 17, 2014 at 8:28 PM, Roman Kennke <rkennke at redhat.com>
> wrote:
> > > Hi there,
> > >
> > > Sorry being so silent... we are very happy that the Shenandoah JEP has
> > > finally been posted and would welcome any comments, questions,
> > > discussion from the community.
> > >
> > > Cheers,
> > > Roman
> > >
> > > Am Mittwoch, den 15.01.2014, 11:49 -0800 schrieb
> > > mark.reinhold at oracle.com:
> > >> Posted: http://openjdk.java.net/jeps/189
> > >>
> > >> - Mark
> > >
> > >
> >
>
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